CN113381934A - Differential service code point DSCP (distributed service control point) drainage method and device - Google Patents

Differential service code point DSCP (distributed service control point) drainage method and device Download PDF

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Publication number
CN113381934A
CN113381934A CN202110654785.4A CN202110654785A CN113381934A CN 113381934 A CN113381934 A CN 113381934A CN 202110654785 A CN202110654785 A CN 202110654785A CN 113381934 A CN113381934 A CN 113381934A
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default
tunnel
policy
public network
drainage
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CN113381934B (en
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邢家茂
郭楷
杨杰
雷丽琴
吴国华
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New H3C Security Technologies Co Ltd
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New H3C Security Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/34—Source routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/74—Address processing for routing
    • H04L45/741—Routing in networks with a plurality of addressing schemes, e.g. with both IPv4 and IPv6
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
    • H04L63/101—Access control lists [ACL]

Abstract

The embodiment of the application provides a Differential Service Code Point (DSCP) drainage method and a device, which are applied to PE equipment, and the method comprises the following steps: receiving a message carrying a first DSCP value of a first service type; according to the destination address matching tunnel binding strategy of the message, determining a Policy tunnel group associated with the message, wherein the Policy tunnel group comprises a default drainage public network Policy tunnel which is in a connected state; and if the default drainage public network Policy tunnel comprises a first default drainage public network Policy tunnel of the first service type, and the DSCP value of the first service type quoted by the first default drainage public network Policy tunnel comprises a first DSCP value, forwarding the message through the first default drainage public network Policy tunnel. By applying the technical scheme provided by the embodiment of the application, the number of ACL list items occupied by DSCP (distributed service control protocol) drainage services is reduced.

Description

Differential service code point DSCP (distributed service control point) drainage method and device
Technical Field
The application relates to the technical field of networks, in particular to a Differential Service Code Point (DSCP) drainage method and device.
Background
The Segment Routing 6 th version Traffic Engineering Policy (SRv 6 TE Policy) is a flexible SRv6 forwarding Policy, and can select a suitable forwarding path for a Provider Edge (PE) device according to service requirements.
SRv6 TE Policy drainage refers to that a message is drained to a Policy tunnel by matching certain message characteristics or routing rules, and then the message is forwarded according to the Policy tunnel. DSCP drainage is one of SRv6 TE Policy drainage. Specifically, an Access Control List (ACL) entry is set in the PE device, where the ACL entry is used to store a corresponding relationship between a Differentiated Services Code Point (DSCP) value, a Color (Color) attribute, and a Policy tunnel.
For the received message, after the PE device matches a tunnel binding Policy according to the destination address of the message and associates with the SRv6 TE Policy tunnel group, the DSCP value carried by the message is matched with the ACL entry, the Policy tunnel corresponding to the DSCP value carried by the message is determined from the SRv6 TE Policy tunnel group, and the message is forwarded based on the Policy tunnel.
Based on the above, in the related art, an ACL entry needs to be occupied to implement DSCP drainage. A single DSCP drainage service has 128 DSCP values, and therefore, the single DSCP drainage service occupies 128 ACL entries. And the ACL table entries in the PE device are limited, so that the DSCP flow guiding service is limited by the ACL table entries.
Disclosure of Invention
An object of the embodiments of the present application is to provide a method and an apparatus for differential service code point DSCP drainage, so as to reduce the number of ACL entries occupied by DSCP drainage services. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a differential service code point DSCP drainage method, which is applied to a PE device, and the method includes:
receiving a message carrying a first DSCP value of a first service type;
determining a Policy (Policy) tunnel group associated with the message according to the destination address matching tunnel binding Policy of the message, wherein the Policy tunnel group comprises a default drainage public network Policy tunnel which is in a connected state;
and if the default drainage public network Policy tunnel comprises a first default drainage public network Policy tunnel of the first service type, and the DSCP value of the first service type quoted by the first default drainage public network Policy tunnel comprises the first DSCP value, forwarding the message through the first default drainage public network Policy tunnel.
Optionally, before receiving the packet, the method further includes:
selecting a default Policy tunnel from default Policy tunnels of multiple service types as a default drainage public network Policy tunnel of the multiple service types, and setting the default drainage public network Policy tunnels of the multiple service types to be in a communication state; alternatively, the first and second electrodes may be,
and respectively taking the default Policy tunnel of each service type as the default drainage public network Policy tunnel of each service type, and setting the default drainage public network Policy tunnel of each service type to be in a connected state.
Optionally, before receiving the packet, the method further includes:
selecting a default Policy tunnel with the most DSCP values from default Policy tunnels of multiple service types, taking the default Policy tunnel with the most DSCP values as a default drainage public network Policy tunnel of the multiple service types, and setting the default drainage public network Policy tunnel of the multiple service types to be in a connected state.
Optionally, the method further includes:
for each service type, if the default Policy tunnel of the service type does not exist, the Policy tunnel which refers to the minimum DSCP value of the service type in the Policy tunnel group is used as the default Policy tunnel of the service type.
Optionally, before receiving the packet, the method further includes:
for each service type, selecting the Policy tunnel with the maximum DSCP value for quoting the service type from the Policy tunnel group as a default drainage public network Policy tunnel of the service type, and setting the default drainage public network Policy tunnel of the service type to be in a connected state; alternatively, the first and second electrodes may be,
determining a Policy tunnel with the most DSCP value for each service type from Policy tunnels of multiple service types; and determining the default drainage public network Policy tunnels of the multiple service types from the determined Policy tunnels, and setting the default drainage public network Policy tunnels of the multiple service types to be in a connected state.
In a second aspect, an embodiment of the present application provides a differential service code point DSCP drainage apparatus, which is applied to a PE device, and the apparatus includes:
the receiving module is used for receiving a message carrying a first DSCP value of a first service type;
the determining module is used for determining a Policy tunnel group associated with the message according to the destination address matching tunnel binding Policy of the message, wherein the Policy tunnel group comprises a default drainage public network Policy tunnel, and the default drainage public network Policy tunnel is in a communication state;
and a forwarding module, configured to forward the packet through the first default drainage public network Policy tunnel if the default drainage public network Policy tunnel includes the first default drainage public network Policy tunnel of the first service type, and the DSCP value of the first service type referred by the first default drainage public network Policy tunnel includes the first DSCP value.
Optionally, the apparatus further comprises:
a setting module, configured to select a default Policy tunnel from the default Policy tunnels for multiple service types before receiving the packet, to serve as the default drainage public network Policy tunnel for the multiple service types, and set the default drainage public network Policy tunnel for the multiple service types to be in a connected state; alternatively, the first and second electrodes may be,
the setting module is used for respectively taking the default Policy tunnel of each service type as the default drainage public network Policy tunnel of each service type and setting the default drainage public network Policy tunnel of each service type to be in a connected state.
Optionally, the apparatus further comprises:
and the setting module is used for selecting the default Policy tunnel with the most number of the introduced DSCP values from the default Policy tunnels of the multiple service types before receiving the message, taking the default Policy tunnel with the most number of the introduced DSCP values as the default drainage public network Policy tunnel of the multiple service types, and setting the default drainage public network Policy tunnel of the multiple service types to be in a connected state.
Optionally, the setting module is further configured to, for each service type, if there is no default Policy tunnel of the service type, use the Policy tunnel that refers to the minimum DSCP value of the service type in the Policy tunnel group as the default Policy tunnel of the service type.
Optionally, the apparatus further comprises:
a setting module, configured to select, for each service type, a Policy tunnel with the largest DSCP value that refers to the service type from a Policy tunnel group as a default drainage public network Policy tunnel for the service type before receiving the packet, and set the default drainage public network Policy tunnel for the service type to be in a connected state; alternatively, the first and second electrodes may be,
the setting module is used for determining the Policy tunnel which refers to the maximum DSCP value of each service type from the Policy tunnels of various service types; and determining the default drainage public network Policy tunnels of the multiple service types from the determined Policy tunnels, and setting the default drainage public network Policy tunnels of the multiple service types to be in a connected state.
In a third aspect, an embodiment of the present application provides a PE device, including a processor and a machine-readable storage medium storing machine-executable instructions executable by the processor, the processor being caused by the machine-executable instructions to: implementing any of the Differentiated Services Code Point (DSCP) drainage method steps described above.
In a fourth aspect, the present application provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements any of the above differentiated services code point DSCP drainage method steps.
The embodiment of the present application further provides a computer program, which when running on a computer, causes the computer to execute any of the differentiated services code point DSCP drainage methods described above.
The embodiment of the application has the following beneficial effects:
in the technical scheme provided by the embodiment of the application, a default drainage public network Policy tunnel in a connected state is set in the PE equipment. And after receiving a message which carries the DSCP value quoted by the default drainage public network Policy tunnel and the service type of which is matched with the service type of the default drainage public network Policy tunnel, directly forwarding the message through the default drainage public network Policy tunnel. Therefore, according to the embodiment of the application, ACL entries do not need to be configured in the DSCP flow guiding service, and the number of ACL entries occupied by the DSCP flow guiding service is reduced.
Of course, not all advantages described above need to be achieved at the same time in the practice of any one product or method of the present application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and it is also obvious for a person skilled in the art to obtain other embodiments according to the drawings.
FIG. 1 is a diagram of an application of SRv6 TE Policy tunnel;
fig. 2 is a schematic flow chart of a DSCP drainage method according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of an application scenario of DSCP drainage provided in an embodiment of the present application;
fig. 4 is a first schematic diagram of a determination process of a default drainage public network Policy tunnel according to an embodiment of the present application;
fig. 5 is a second schematic diagram of a determination process of a default drainage public network Policy tunnel according to an embodiment of the present application;
fig. 6 is a third schematic diagram of a determination process of a default drainage public network Policy tunnel according to an embodiment of the present application;
fig. 7 is a schematic diagram of an IPv4 routing table and an IPv6 routing table provided in the embodiment of the present application, where the routing table and the IPv6 routing table use different private networks to forward equivalent class entries;
fig. 8 is a schematic structural diagram of a DSCP drainage device according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a PE device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the description herein are intended to be within the scope of the present disclosure.
In the embodiment of the present application, the SRv6 TE Policy tunnel may be referred to as Policy tunnel for short. The Policy tunnel has the advantages of high reliability, flexible deployment, drainage diversity and the like.
As shown in fig. 1, each open circle in fig. 1 represents a node. The node may be a router or a switch, etc. Policy tunnels may be represented by section 3 below.
1. The Base Station Identity Code (BSID) is a Segment Identifier (SID) of the ingress node. The BSID is used to direct the packet to a Policy tunnel for forwarding.
2. The Color attribute is used for distinguishing a plurality of Policy tunnels between the same source node and destination node. The Color attribute may represent different quality of service requirements. Wherein, the Color attribute may include, but is not limited to, low latency, high bandwidth, and the like. And the user can allocate different Color attributes to different Policy tunnels according to the service requirements.
3. The edge endpoint is the address of the destination node.
The service types include Internet Protocol version 4 (IPv 4) service, Internet Protocol version 6 (IPv 6) service, and the like. A service type message carries an address of a corresponding service type. Specifically, the IPv4 service packet carries an IPv4 address, and the IPv6 service packet carries an IPv6 address.
Based on the above representation of Policy tunnel, the drainage of Policy tunnel can be divided into the following 3 drainage manners.
The first is a BSID based drainage approach. Specifically, if the destination IPv6 address of the message received by the PE device is the BSID of a Policy tunnel, the PE device forwards the message through the Policy tunnel.
The second is a Color drainage based approach. Specifically, if a Color attribute and a next hop address carried by a Border Gateway Protocol (BGP) route on the packet match are respectively matched with a Color attribute and a destination node address of a Policy tunnel, the PE device forwards the packet through the Policy tunnel.
The third is based on the DSCP drainage mode. Specifically, the PE device matches the DSCP value carried by the packet with the ACL entry after associating with the Policy tunnel group according to the destination address of the packet, determines the Policy tunnel corresponding to the DSCP value carried by the packet from the Policy tunnel group, and forwards the packet based on the Policy tunnel.
In a Policy tunnel group, the Color attribute of different Policy tunnels is different. After configuring the mapping relationship between the Color attribute and the DSCP value, a user can form the DSCP value, the Color attribute and an ACL table item of the Policy tunnel in a Policy tunnel group, thereby realizing that the message is guided to the appointed Policy tunnel through the DSCP value of the message.
For the IPv4 address family and the IPv6 address family, the user can specify the mapping relationship of the Color attribute and the DSCP value, respectively. But for messages of the same address family, each DSCP value only supports associating one Color value.
A user may configure a Policy tunnel as a default Policy tunnel for messages of a specified address family. Within a Policy tunnel group, an address family can only have one default Policy tunnel. If the user does not configure any Policy tunnel associated with a DSCP value, the PE device may forward the message using the default Policy tunnel, that is, generate an ACL entry including the DSCP value and the default Policy tunnel, and forward the message using the ACL entry.
According to the above, in the related art, a large number of ACL entries are required to be occupied for realizing DSCP drainage. And the ACL table entries in the PE device are limited, so that the DSCP flow guiding service is limited by the ACL table entries.
In order to solve the above problem, an embodiment of the present application provides a DSCP drainage method, which is applied to a PE device. In the method, a default drainage public network Policy tunnel in a connected state is set in PE equipment. And after receiving a message which carries the DSCP value quoted by the default drainage public network Policy tunnel and the service type of which is matched with the service type of the default drainage public network Policy tunnel, directly forwarding the message through the default drainage public network Policy tunnel. Therefore, according to the embodiment of the application, ACL entries do not need to be configured in the DSCP flow guiding service, and the number of ACL entries occupied by the DSCP flow guiding service is reduced.
The DSCP drainage method provided in the embodiments of the present application is described in detail below with specific embodiments.
As shown in fig. 2, fig. 2 is a schematic flow chart of a DSCP drainage method according to an embodiment of the present disclosure. The method is applied to the PE equipment and comprises the following steps.
Step S21, receiving a message carrying the first DSCP value of the first service type.
The PE equipment receives messages input by other PE equipment or users. The embodiment of the present application only takes the received message as the message of the first service type, and the DSCP value carried in the received message is the first DSCP value for example, which does not have a limiting effect.
The service type of the message may also be other service types. The first service type may be an IPv4 service or an IPv6 service.
In the embodiment of the present application, there may be 64 DSCP values of IPv4 services, and there may be 64 DSCP values of IPv6 services. The first DSCP value may be any one of 64 DSCP values corresponding to the first service type.
And step S22, determining a Policy tunnel group associated with the message according to the destination address of the message matching with the tunnel binding Policy, wherein the Policy tunnel group comprises a default drainage public network Policy tunnel which is in a connected state.
After receiving the message, the PE device matches the destination address of the message with the tunnel binding Policy, and determines a Policy tunnel group matched with the destination address of the message, namely, a Policy tunnel group associated with the message.
The tunnel binding Policy may include a correspondence between the destination address and the Policy tunnel group. Thus, when the destination address of the message is matched with the tunnel binding strategy, the Policy tunnel group associated with the message can be determined.
The tunnel binding policy may be set according to a tunnel binding policy in the related art, and is not set.
In the embodiment of the present application, the Policy tunnel group includes a plurality of Policy tunnels. The plurality of Policy tunnels may include a default drainage public network Policy tunnel. The default drainage public network Policy tunnel is in a connected state. Under the condition, the message carrying the DSCP value quoted by the default drainage public network Policy tunnel can be forwarded through the default drainage public network Policy tunnel, ACL table items do not need to be configured, ACL table item matching does not need to be utilized, the Policy tunnel is set to be in a communication state, and the ACL table items comprising the DSCP value quoted by the default drainage public network Policy tunnel are further saved.
Step S23, if the default drainage public network Policy tunnel includes a first default drainage public network Policy tunnel of the first service type, and the DSCP value of the first service type referred by the first default drainage public network Policy tunnel includes the first DSCP value, forwarding the packet through the first default drainage public network Policy tunnel.
After determining the Policy tunnel group associated with the packet, the PE device may detect whether the default drainage public network Policy tunnel in the Policy tunnel group includes a first default drainage public network Policy tunnel of the first service type, and detect whether the DSCP value of the first service type referred by the first default drainage public network Policy tunnel includes the first DSCP value.
And if the default drainage public network Policy tunnel comprises a first default drainage public network Policy tunnel and the DSCP value of the first service type quoted by the first default drainage public network Policy tunnel comprises a first DSCP value, the PE equipment directly transmits the message through the first default drainage public network Policy tunnel.
For example, the application scenario of DSCP drainage shown in fig. 3 is taken as an example for explanation. In FIG. 3, PE1 is the source node, P1-P6 are intermediate nodes, and PE2 is the destination node. The Policy tunnel groups of PE1 to PE2 include Policy _1, Policy _ i, and Policy _ n. Wherein, Policy _ i is a default drainage public network Policy tunnel of the IPv4 service, and Policy _ n is a default drainage public network Policy tunnel of the IPv6 service. Wherein, the DSCP values referred by Policy _ i include: DSCP value 01-05 of IPv4 service and DSCP value 11-13 of IPv6 service. Policy _ n refers to DSCP values including: the DSCP value 06-08 of IPv4 service and the DSCP value 14-18 of IPv6 service.
PE1 receives message 1 of IPv4 traffic. Because the tunnel group of the PE1 includes a default drainage public network Policy tunnel for IPv4 traffic, that is, Policy _ i, if the DSCP value of the IPv4 traffic included in the Policy _ i includes the DSCP value carried in the message 1, such as DSCP value 01, the PE1 forwards the message 1 through the Policy _ i.
In an embodiment of the present application, if the following occurs, the PE device may discard the received packet, or match a DSCP value carried in the packet with an ACL entry, and further forward the packet.
In case one, the default drainage public network Policy tunnel does not include the first default drainage public network Policy tunnel of the first service type;
in case two, the DSCP value of the first traffic type referred by the first default drainage public network Policy tunnel includes a first DSCP value;
and in a third case, the default drainage public network Policy tunnel does not comprise a first default drainage public network Policy tunnel of the first service type, and the DSCP value of the first service type referred by the first default drainage public network Policy tunnel comprises the first DSCP value.
When the above three situations occur, the processing operation of the PE device on the packet may be specifically set according to actual requirements, which is not limited.
In an embodiment of the present application, before receiving a packet, a default Policy tunnel for each service type is set in the PE device. The PE equipment selects a default Policy tunnel from default Policy tunnels of multiple service types to serve as a default drainage public network Policy tunnel of the multiple service types, and sets the default drainage public network Policy tunnel of the multiple service types to be in a connected state. At this time, a plurality of service types share one default drainage public network Policy tunnel.
In another embodiment of the present application, before receiving the packet, the PE device sets a default Policy tunnel for each service type. The PE device takes the default Policy tunnel of each service type as the default drainage public network Policy tunnel of each service type respectively, and sets the default drainage public network Policy tunnel of each service type to be in a connected state.
A service type default drainage public network Policy tunnel is only in a connected state for the service type and the message carrying the DSCP value quoted by the default drainage public network Policy tunnel.
In another embodiment of the present application, for each service type, if the PE device does not have a default Policy tunnel for the service type, the PE device may use the Policy tunnel referring to the minimum DSCP value of the service type in the Policy tunnel group as the default Policy tunnel for the service type. The PE device may then determine a default drainage public network Policy tunnel for the multiple traffic types based on the default Policy tunnel for the multiple traffic types.
Taking the service types including IPv4 service and IPv6 service as an example, the flow of determining the default drainage public network Policy tunnel is shown in fig. 4, and may include the following steps.
In step S41, the PE device obtains the input Policy tunnel group.
At step S42, the PE device traverses each Policy tunnel in the Policy tunnel group to record the default Policy tunnel DefaultPolicy _ v4 of the IPv4 traffic, and record the Policy tunnel dscpinplicy _ v4 that references the minimum DSCP value of the IPv4 traffic.
In step S43, the PE device determines whether DefaultPolicy _ v4 exists. If not, step S44 is executed. If yes, go to step S45.
In step S44, the PE device takes DscpMinPolicy _ v4 as DefaultPolicy _ v 4.
At step S45, the PE device traverses each Policy tunnel in the Policy tunnel group to record the default Policy tunnel DefaultPolicy _ v6 of the IPv 6traffic, and record the Policy tunnel dscpinplicy _ v6 that references the minimum DSCP value of the IPv6 traffic.
In the embodiment of the present application, the execution order of step S42 and step S45 is not limited.
In step S46, the PE device determines whether DefaultPolicy _ v6 exists. If not, step S47 is executed. If yes, go to step S48.
In step S47, the PE device takes DscpMinPolicy _ v6 as DefaultPolicy _ v 6.
In step S48, the PE device detects whether DefaultPolicy _ v4 and DefaultPolicy _ v6 exist respectively.
If DefaultPolicy _ v4 exists and DefaultPolicy _ v6 does not exist, go to step S49.
If DefaultPolicy _ v4 does not exist and DefaultPolicy _ v6 exists, go to step S410.
If DefaultPolicy _ v4 exists and DefaultPolicy _ v6 exists, go to step S411.
If the default Policy _ v4 does not exist and the default Policy _ v6 does not exist, the default drainage public network Policy tunnel is not set, and the subsequent PE device may forward the message by using the ACL entry in the related technology, which is not described herein again.
In step S49, the PE device uses the default Policy _ v4 as the default Policy tunnel default Policy _ v6 of the IPv6 service, and keeps the default Policy tunnel default Policy _ v4 of the IPv4 service unchanged.
In step S410, the PE device uses the default Policy _ v6 as the default Policy tunnel default Policy _ v4 of the IPv4 service, and keeps the default Policy tunnel default Policy _ v6 of the IPv6 service unchanged.
In step S411, the PE device determines a default drainage public network Policy tunnel for each service type from DefaultPolicy _ v4 and DefaultPolicy _6, and sets the default drainage public network Policy tunnel to be in a connected state.
For example, the PE device uses DefaultPolicy _ v4 as a default drainage public network Policy tunnel for IPv4 service, and uses DefaultPolicy _ v6 as a default drainage public network Policy tunnel for IPv6 service.
For another example, the PE device uses DefaultPolicy _ v4 as a default drainage public network Policy tunnel for IPv4 service, and uses DefaultPolicy _ v4 as a default drainage public network Policy tunnel for IPv6 service.
For another example, the PE device uses DefaultPolicy _ v6 as a default drainage public network Policy tunnel for IPv4 service, and uses DefaultPolicy _ v6 as a default drainage public network Policy tunnel for IPv6 service.
In step S412, the PE device outputs the determined default drainage public network Policy tunnel.
By applying the technical scheme provided by the embodiment of the application, the ACL list items can be effectively saved. For example, Policy _ i is used as the default drainage public network Policy tunnel for IPv4 traffic, and Policy _ i is used as the default drainage public network Policy tunnel for IPv6 traffic. If there are m IPv4 service DSCP values referred by Policy _ i and n IPv6 service DSCP values referred by Policy _ i, m + n ACL entries can be saved.
In an embodiment of the present application, the PE device may select a default Policy tunnel that refers to the largest DSCP value from among default Policy tunnels for multiple service types, to serve as a default drainage public network Policy tunnel for multiple service types, and set the default drainage public network Policy tunnel for multiple service types to be in a connected state.
Taking the service types including IPv4 service and IPv6 service as an example, the flow of determining the default drainage public network Policy tunnel is shown in fig. 5, and may include the following steps.
In step S51, the PE device obtains the input Policy tunnel group.
At step S52, the PE device traverses each Policy tunnel in the Policy tunnel group to record the default Policy tunnel DefaultPolicy _ v4 of the IPv4 traffic, and record the Policy tunnel dscpinplicy _ v4 that references the minimum DSCP value of the IPv4 traffic.
In step S53, the PE device determines whether DefaultPolicy _ v4 exists. If not, step S54 is executed. If yes, go to step S55.
In step S54, the PE device takes DscpMinPolicy _ v4 as DefaultPolicy _ v 4.
At step S55, the PE device traverses each Policy tunnel in the Policy tunnel group to record the default Policy tunnel DefaultPolicy _ v6 of the IPv 6traffic, and record the Policy tunnel dscpinplicy _ v6 that references the minimum DSCP value of the IPv6 traffic.
In the embodiment of the present application, the execution order of step S52 and step S55 is not limited.
In step S56, the PE device determines whether DefaultPolicy _ v6 exists. If not, step S57 is executed. If yes, go to step S58.
In step S57, the PE device takes DscpMinPolicy _ v6 as DefaultPolicy _ v 6.
In step S58, the PE device detects whether DefaultPolicy _ v4 and DefaultPolicy _ v6 exist respectively.
If DefaultPolicy _ v4 exists and DefaultPolicy _ v6 does not exist, go to step S59.
If DefaultPolicy _ v4 does not exist and DefaultPolicy _ v6 exists, go to step S510.
If DefaultPolicy _ v4 exists and DefaultPolicy _ v6 exists, go to step S511.
If the default Policy _ v4 does not exist and the default Policy _ v6 does not exist, the default drainage public network Policy tunnel is not set, and the subsequent PE device may forward the message by using the ACL entry in the related technology, which is not described herein again.
In step S59, the PE device uses the default Policy _ v4 as the default Policy tunnel default Policy _ v6 of the IPv6 service, and keeps the default Policy tunnel default Policy _ v4 of the IPv4 service unchanged.
In step S510, the PE device uses the default Policy _ v6 as the default Policy tunnel default Policy _ v4 of the IPv4 service, and keeps the default Policy tunnel default Policy _ v6 of the IPv6 service unchanged.
In step S511, the PE device selects the default Policy tunnel that refers to the largest DSCP value from DefaultPolicy _ v4 and DefaultPolicy _6, and uses the default Policy tunnel as a default drainage public network Policy tunnel for multiple service types, and sets the default drainage public network Policy tunnel to be in a connected state.
For example, the total number of DSCP values of the IPv4 service and the IPv6 service referred to by the DefaultPolicy _ v4 is m ', and the total number of DSCP values of the IPv4 service and the IPv6 service referred to by the DefaultPolicy _ v6 is n'.
If m '> n', the PE device uses DefaultPolicy _ v4 as a default drainage public network Policy tunnel shared by the IPv4 service and the IPv6 service.
Otherwise, the PE device uses DefaultPolicy _ v6 as a default drainage public network Policy tunnel shared by the IPv4 service and the IPv6 service.
And S512, the PE equipment outputs the determined default drainage public network Policy tunnel.
In an embodiment of the present application, in order to save ACL entries as much as possible, the PE device determines, from Policy tunnels of multiple service types, a Policy tunnel that refers to a DSCP value of each service type most; and determining default drainage public network Policy tunnels of multiple service types from the determined Policy tunnels, and setting the default drainage public network Policy tunnels of the multiple service types to be in a connected state.
For example, the PE device refers to Policy tunnel 1 with the largest DSCP value for IPv4 traffic and Policy tunnel 2 with the largest DSCP value for IPv6 traffic. The PE device may determine a default drainage public network Policy tunnel shared by IPv4 traffic and IPv 6traffic from Policy tunnel 1 and Policy tunnel 2.
In this embodiment of the present application, the PE device may select, from the determined Policy tunnels, a Policy tunnel that refers to the largest DSCP value as a default drainage public network Policy tunnel for multiple service types. The above example is still used as an example for explanation. And if the number of DSCP values quoted by the PE device Policy tunnel 1 is greater than that quoted by the Policy tunnel 2, the Policy tunnel 1 is used as a default drainage public network Policy tunnel shared by the IPv4 service and the IPv6 service.
Specifically, referring to the determination process of the default drainage public network Policy tunnel shown in fig. 6, the determination process may include the following steps:
in step S61, the PE device obtains the input Policy tunnel group.
In step S62, the PE device traverses each Policy tunnel in the Policy tunnel group to record the Policy tunnel dscpcnmmaxpolicy _ v4 that refers to the service DSCP value of IPv4 the most and the Policy tunnel dscpcnmmaxpolicy _ v6 that refers to the service DSCP value of IPv6 the most.
In step S63, the PE device compares dscpcntmaxphyllcy _ v4 with dscpcntmaxphyllcy _ v6 to obtain the maximum value dscpntmax of the number of reference DSCP values. If DscpCntMax is greater than 0, step S64 is performed. If not, the default drainage public network Policy tunnel is not set, and the subsequent PE device may forward the message by using the ACL entry in the related technology, which is not described here again.
Step S64, the PE device uses the Policy tunnel corresponding to the DscpCntMax as a default drainage public network Policy tunnel shared by the IPv4 service and the IPv6 service.
And step S65, the PE equipment outputs the determined default drainage public network Policy tunnel.
In another embodiment of the present application, to save ACL entries to the maximum extent, for each service type, the PE device may select, from a Policy tunnel group, a Policy tunnel that refers to the service type with the largest DSCP value, as a default drainage public network Policy tunnel for the service type, and set the default drainage public network Policy tunnel for the service type to be in a connected state.
For example, for the IPv4 service, the PE device selects a Policy tunnel that refers to the maximum DSCP value of the IPv4 service from the Policy tunnel group as the default Policy tunnel for the IPv4 service to direct the public network Policy tunnel.
For the IPv6 service, the PE device selects the Policy tunnel which refers to the IPv6 service with the largest DSCP value from the Policy tunnel group as the default drainage public network Policy tunnel of the IPv6 service.
By applying the technical scheme provided by the embodiment of the application, a plurality of default drainage public network Policy tunnels are obtained according to different service types, as shown in fig. 7, an IPv4 routing table and an IPv6 routing table are converted into two private network forwarding equivalence class table entries from one private network forwarding equivalence class table entry, and the purpose of occupied ACL table entries is further optimized. The private network forwarding equivalence class table item is used for indicating the message to be forwarded according to the default drainage public network Policy tunnel.
For example, Policy _ i references DSCP values that include: DSCP value 01-05 of IPv4 service and DSCP value 11-13 of IPv6 service. Policy _ n refers to DSCP values including: the DSCP value 06-08 of IPv4 service and the DSCP value 14-18 of IPv6 service. Wherein, Policy _ i is a Policy tunnel which refers to IPv4 service DSCP with the most value, and Policy _ n is a Policy tunnel which refers to IPv6 service DSCP with the most value.
If Policy _ i is used as a default drainage public network Policy tunnel for IPv4 traffic and IPv 6traffic, 5+3 to 8 ACL entries can be saved.
If Policy _ n is used as a default drainage public network Policy tunnel for IPv4 traffic and IPv 6traffic, 3+ 5-8 ACL entries can be saved.
If Policy _ i is used as the default drainage public network Policy tunnel for IPv4 traffic, and Policy _ n is used as the default drainage public network Policy tunnel for IPv 6traffic, 5+5 to 10 ACL entries can be saved.
It can be seen that 10> 8. The method and the device for setting the ACL list entry in the traffic control system respectively set the default drainage public network Policy tunnels with different service types, and further optimize the purpose of occupying the ACL list entry.
Corresponding to the above DSCP value drainage method, an embodiment of the present application further provides a DSCP value drainage device, as shown in fig. 8, the device includes:
a receiving module 81, configured to receive a packet carrying a first DSCP value of a first service type;
the determining module 82 is configured to determine a Policy tunnel group associated with the packet according to the destination address of the packet matching the tunnel binding Policy, where the Policy tunnel group includes a default drainage public network Policy tunnel, and the default drainage public network Policy tunnel is in a connected state;
the forwarding module 83 is configured to forward the packet through the first default drainage public network Policy tunnel if the default drainage public network Policy tunnel includes the first default drainage public network Policy tunnel of the first service type and the DSCP value of the first service type referred by the first default drainage public network Policy tunnel includes the first DSCP value.
In an embodiment of the present application, the DSCP drainage device may further include:
the device comprises a setting module, a sending module and a receiving module, wherein the setting module is used for selecting a default Policy tunnel from default Policy tunnels of multiple service types before receiving a message, taking the default Policy tunnel as a default drainage public network Policy tunnel of the multiple service types, and setting the default drainage public network Policy tunnel of the multiple service types to be in a communication state; alternatively, the first and second electrodes may be,
and the setting module is used for respectively taking the default Policy tunnel of each service type as the default drainage public network Policy tunnel of each service type and setting the default drainage public network Policy tunnel of each service type to be in a connected state.
In an embodiment of the present application, the DSCP drainage device may further include:
and the setting module is used for selecting the default Policy tunnel with the most quoted DSCP value from the default Policy tunnels of the multiple service types before receiving the message, taking the default Policy tunnel as the default drainage public network Policy tunnel of the multiple service types, and setting the default drainage public network Policy tunnel of the multiple service types to be in a connected state.
In an embodiment of the present application, the setting module may be further configured to, for each service type, if there is no default Policy tunnel for the service type, use the Policy tunnel referring to the minimum DSCP value of the service type in the Policy tunnel group as the default Policy tunnel for the service type.
In an embodiment of the present application, the DSCP drainage device may further include:
a setting module, configured to select, for each service type, a Policy tunnel with the largest DSCP value that refers to the service type from a Policy tunnel group as a default drainage public network Policy tunnel for the service type before receiving the packet, and set the default drainage public network Policy tunnel for the service type to be in a connected state; alternatively, the first and second electrodes may be,
the device comprises a setting module, a judging module and a judging module, wherein the setting module is used for determining a Policy tunnel which refers to the maximum DSCP value of each service type from the Policy tunnels of various service types; and determining default drainage public network Policy tunnels of multiple service types from the determined Policy tunnels, and setting the default drainage public network Policy tunnels of the multiple service types to be in a connected state.
In the technical scheme provided by the embodiment of the application, a default drainage public network Policy tunnel in a connected state is set in the PE equipment. And after receiving a message which carries the DSCP value quoted by the default drainage public network Policy tunnel and the service type of which is matched with the service type of the default drainage public network Policy tunnel, directly forwarding the message through the default drainage public network Policy tunnel. Therefore, according to the embodiment of the application, ACL entries do not need to be configured in the DSCP flow guiding service, and the number of ACL entries occupied by the DSCP flow guiding service is reduced.
Corresponding to the above DSCP streaming method, an embodiment of the present application further provides a PE device, as shown in fig. 9, including a processor 91 and a machine-readable storage medium 92, where the machine-readable storage medium 92 stores machine-executable instructions executable by the processor 91, and the processor 91 is caused by the machine-executable instructions to: implementing any of the above DSCP drainage method steps.
The machine-readable storage medium may include Random Access Memory (RAM) and may also include Non-Volatile Memory (NVM), such as at least one disk Memory. Alternatively, the machine-readable storage medium may be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor including a Central Processing Unit (CPU), a Network Processor (NP), etc.; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components.
Corresponding to the above DSCP drainage method, in another embodiment provided by the present application, a computer-readable storage medium is further provided, in which a computer program is stored, and the computer program, when executed by a processor, implements any of the above DSCP drainage method steps.
Corresponding to the above DSCP drainage method, in another embodiment provided by the present application, there is further provided a computer program, which when run on a computer, causes the computer to perform any of the above DSCP drainage method steps.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus, the PE device, the computer-readable storage medium and the computer program embodiment, since they are substantially similar to the method embodiment, the description is relatively simple, and in relation to the description, reference may be made to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims (12)

1. A Differential Service Code Point (DSCP) drainage method applied to a service Provider Edge (PE) device, the method comprising:
receiving a message carrying a first DSCP value of a first service type;
determining a Policy tunnel group associated with the message according to the destination address matching tunnel binding Policy of the message, wherein the Policy tunnel group comprises a default drainage public network Policy tunnel which is in a connected state;
and if the default drainage public network Policy tunnel comprises a first default drainage public network Policy tunnel of the first service type, and the DSCP value of the first service type quoted by the first default drainage public network Policy tunnel comprises the first DSCP value, forwarding the message through the first default drainage public network Policy tunnel.
2. The method of claim 1, wherein prior to receiving the message, the method further comprises:
selecting a default Policy tunnel from default Policy tunnels of multiple service types as a default drainage public network Policy tunnel of the multiple service types, and setting the default drainage public network Policy tunnels of the multiple service types to be in a communication state; alternatively, the first and second electrodes may be,
and respectively taking the default Policy tunnel of each service type as the default drainage public network Policy tunnel of each service type, and setting the default drainage public network Policy tunnel of each service type to be in a connected state.
3. The method of claim 1, wherein prior to receiving the message, the method further comprises:
selecting a default Policy tunnel with the most DSCP values from default Policy tunnels of multiple service types, taking the default Policy tunnel with the most DSCP values as a default drainage public network Policy tunnel of the multiple service types, and setting the default drainage public network Policy tunnel of the multiple service types to be in a connected state.
4. A method according to claim 2 or 3, characterized in that the method further comprises:
for each service type, if the default Policy tunnel of the service type does not exist, the Policy tunnel which refers to the minimum DSCP value of the service type in the Policy tunnel group is used as the default Policy tunnel of the service type.
5. The method of claim 1, wherein prior to receiving the message, the method further comprises:
for each service type, selecting the Policy tunnel with the maximum DSCP value for quoting the service type from the Policy tunnel group as a default drainage public network Policy tunnel of the service type, and setting the default drainage public network Policy tunnel of the service type to be in a connected state; alternatively, the first and second electrodes may be,
determining a Policy tunnel with the most DSCP value for each service type from Policy tunnels of multiple service types; and determining the default drainage public network Policy tunnels of the multiple service types from the determined Policy tunnels, and setting the default drainage public network Policy tunnels of the multiple service types to be in a connected state.
6. A Differential Service Code Point (DSCP) drainage apparatus, applied to a service Provider Edge (PE) device, the apparatus comprising:
the receiving module is used for receiving a message carrying a first DSCP value of a first service type;
the determining module is used for determining a Policy tunnel group associated with the message according to the destination address matching tunnel binding Policy of the message, wherein the Policy tunnel group comprises a default drainage public network Policy tunnel, and the default drainage public network Policy tunnel is in a communication state;
and a forwarding module, configured to forward the packet through the first default drainage public network Policy tunnel if the default drainage public network Policy tunnel includes the first default drainage public network Policy tunnel of the first service type, and the DSCP value of the first service type referred by the first default drainage public network Policy tunnel includes the first DSCP value.
7. The apparatus of claim 6, further comprising:
a setting module, configured to select a default Policy tunnel from the default Policy tunnels for multiple service types before receiving the packet, to serve as the default drainage public network Policy tunnel for the multiple service types, and set the default drainage public network Policy tunnel for the multiple service types to be in a connected state; alternatively, the first and second electrodes may be,
the setting module is used for respectively taking the default Policy tunnel of each service type as the default drainage public network Policy tunnel of each service type and setting the default drainage public network Policy tunnel of each service type to be in a connected state.
8. The apparatus of claim 6, further comprising:
and the setting module is used for selecting the default Policy tunnel with the most number of the introduced DSCP values from the default Policy tunnels of the multiple service types before receiving the message, taking the default Policy tunnel with the most number of the introduced DSCP values as the default drainage public network Policy tunnel of the multiple service types, and setting the default drainage public network Policy tunnel of the multiple service types to be in a connected state.
9. The apparatus according to claim 7 or 8,
the setting module is further configured to, for each service type, if there is no default Policy tunnel of the service type, use the Policy tunnel that refers to the minimum DSCP value of the service type in the Policy tunnel group as the default Policy tunnel of the service type.
10. The apparatus of claim 6, further comprising:
a setting module, configured to select, for each service type, a Policy tunnel with the largest DSCP value that refers to the service type from a Policy tunnel group as a default drainage public network Policy tunnel for the service type before receiving the packet, and set the default drainage public network Policy tunnel for the service type to be in a connected state; alternatively, the first and second electrodes may be,
the setting module is used for determining the Policy tunnel which refers to the maximum DSCP value of each service type from the Policy tunnels of various service types; and determining the default drainage public network Policy tunnels of the multiple service types from the determined Policy tunnels, and setting the default drainage public network Policy tunnels of the multiple service types to be in a connected state.
11. A service provider edge, PE, device comprising a processor and a machine-readable storage medium storing machine-executable instructions executable by the processor, the processor being caused by the machine-executable instructions to: carrying out the method steps of any one of claims 1 to 5.
12. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of any one of the claims 1-5.
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