CN108259644B - Communication equipment and ARP table entry generation method thereof - Google Patents
Communication equipment and ARP table entry generation method thereof Download PDFInfo
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- CN108259644B CN108259644B CN201810051269.0A CN201810051269A CN108259644B CN 108259644 B CN108259644 B CN 108259644B CN 201810051269 A CN201810051269 A CN 201810051269A CN 108259644 B CN108259644 B CN 108259644B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/10—Mapping addresses of different types
- H04L61/103—Mapping addresses of different types across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
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- 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
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/0807—Network architectures or network communication protocols for network security for authentication of entities using tickets, e.g. Kerberos
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- 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
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/0876—Network architectures or network communication protocols for network security for authentication of entities based on the identity of the terminal or configuration, e.g. MAC address, hardware or software configuration or device fingerprint
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Abstract
The invention provides a communication device applied to an optical line terminal and an ARP table entry generation method thereof, wherein the method comprises the following steps: the exchange chip receives the ARP message through a first chip port connected with the first PON chip; the exchange chip adds a first chip port identifier and a Q-in-Q label to the ARP message and sends the ARP message to a CPU; the CPU carries out security authentication on VLAN information of a Q-in-Q label of an ARP message, determines that the VLAN information passes the security authentication, generates an ARP table entry according to a first chip port identifier and the ARP message, and synchronizes the generated ARP table entry to a switching chip; wherein, the output port of the ARP table entry is the first chip port. The invention can make full use of the existing protocol message speed-limiting and anti-attack functions of the exchange chip by sending the ARP message to the host CPU from the exchange chip, thereby avoiding the impact of the ARP message on the host CPU.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a passive optical network, and in particular, to a communication device and an ARP entry generation method thereof.
Background
ARP (Address Resolution Protocol) is a Protocol for resolving an IP Address into an ethernet MAC (Media Access Control) Address, and a table entry generated by ARP is issued to a FIB (Forward Information Base) of a switch chip to guide three-layer data traffic forwarding. The FIB entry mainly includes an IP address, an MAC address, a VLAN (Virtual Local Area Network) and an egress interface.
In a PON (Passive Optical Network ) system, a port (hereinafter referred to as GE port) of a switch chip of an OLT (Optical Line Terminal) device is connected to an upstream port of a PON chip, and each switch chip may be connected to a plurality of PON chips; each PON chip is provided with 20-40 PON ports, and each PON port is connected to a plurality of ONU (Optical Network Unit) devices through an Optical splitter.
Fig. 1 shows a conventional process of an OLT apparatus learning an ARP entry of an ONU. As shown in fig. 1, the PON chip receives an ARP protocol packet through the PON port, adds an ONU interface index, and sends the ARP packet with the ONU interface index to the host CPU. The CPU of the host analyzes the ARP message to generate an ARP table entry, and records an output interface of the ARP table entry as an ONU interface pointed by the ONU interface index. The host CPU modifies the output port of the generated ARP entry into a GE port (e.g., G1 port in fig. 2) of the PON chip where the switching chip is connected to the PON port, and resynchronizes the ARP entry with the modified output port.
The problem of the existing scheme is that the CPU is impacted because a plurality of PON chips of the OLT device send ARP messages to the CPU. In addition, when the ONU device migrates from the PON port of one PON chip to the PON ports of other PON chips, if there is no ARP packet to trigger the ARP entry update, the egress ports of the ARP entries on the switching chip and the CPU cannot be updated. When the OLT receives a downlink three-layer data packet addressed to the migrated ONU device, a forwarding failure occurs.
Disclosure of Invention
In view of this, the present invention provides a communication device and an ARP entry generation method thereof, which avoid the impact of the ARP packet on the host CPU.
To achieve the above object, an embodiment of the present invention provides an ARP entry generation method, including:
the exchange chip receives the ARP message through a first chip port connected with the first PON chip;
the exchange chip adds a first chip port identifier and a Q-in-Q label to the ARP message, and sends the ARP message with the first chip port identifier and the Q-in-Q label to the CPU;
the CPU carries out security authentication on VLAN information of a Q-in-Q label of an ARP message, determines that the VLAN information passes the security authentication, generates an ARP table entry according to a first chip port identifier and the ARP message, and synchronizes the generated ARP table entry to a switching chip;
the MAC address and the IP address of the ARP table entry are respectively the MAC address and the IP address of a sending end of the ARP message; the output port of the ARP table entry is a first chip port.
In order to achieve the above object, an embodiment of the present invention further provides a communication device, including: more than two PON chips, a switching chip and a CPU;
the exchange chip receives the ARP message through a first chip port connected with the first PON chip;
the exchange chip adds a first chip port identifier and a Q-in-Q label to the ARP message, and sends the ARP message with the first chip port identifier and the Q-in-Q label to the CPU;
the CPU carries out security authentication on VLAN information of a Q-in-Q label of an ARP message, determines that the VLAN information passes the security authentication, generates an ARP table entry according to a first chip port identifier and the ARP message, and synchronizes the generated ARP table entry to a switching chip;
the MAC address and the IP address of the ARP table entry are respectively the MAC address and the IP address of a sending end of the ARP message; the output port of the ARP table entry is a first chip port.
The embodiment of the invention has the following beneficial effects: the PON chip of the OLT equipment sends the ARP message to the host CPU through the switching chip, so that the impact of the ARP message on the host CPU is avoided, and the impact on the CPU is reduced based on the speed limit and anti-attack functions of the switching chip.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a prior art method for an OLT apparatus to learn ARP entries;
fig. 2 is a flowchart of an ARP entry generation method according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a process of an OLT device learning ARP entry according to the embodiment of fig. 2;
FIG. 4 is a flow diagram illustrating security authentication generated by an ARP entry provided in the embodiment of FIG. 2;
fig. 5 is a flowchart of an ARP entry generation method according to another embodiment of the present invention;
FIG. 6 is a flow chart of security authentication in the embodiment of FIG. 5;
fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The ARP entry generation method shown in fig. 2 is applied to an OLT device, and the OLT device includes two or more PON chips, a switch chip, and a CPU. As shown in fig. 2, the method comprises the steps of:
s201: the exchange chip receives the ARP message through a first chip port connected with the first PON chip.
In practical applications, the ONU device may send an ARP request message or a gratuitous ARP message, and the switching chip of the OLT device can receive the ARP message through the first chip port P11 of the first PON chip connected to the switching chip.
S202: the exchange chip adds a first chip port identification and a Q-in-Q label to the ARP message, and sends the ARP message with the first chip port identification and the Q-in-Q label to the CPU.
S203: the CPU carries out security authentication on VLAN information of a Q-in-Q label of the ARP message, confirms that the VLAN information passes the security authentication, generates an ARP table entry according to the first chip port identification and the ARP message, and synchronizes the generated ARP table entry to the exchange chip.
The MAC address and the IP address of the ARP table entry are respectively the MAC address and the IP address of a sending end of the ARP message; the output port of the ARP entry is the first chip port P11.
The CPU carries out security authentication on the VLAN information of the Q-in-Q label of the ARP message means that the CPU searches whether the VLAN information of the Q-in-Q label of the ARP message is a preset security VLAN according to a preset security authentication list.
Referring to fig. 3, a Q-in-Q packet of an ARP packet sent by a switch chip to a CPU carries a GE port interface index, i.e., an egress interface, such as a G1 port corresponding to a P11 port of a PON port connected to an ONU in fig. 3. And then the CPU performs security authentication according to the outer VLAN information in the added Q-in-Q tag, namely, judges whether the VLAN information is a certain appointed VLAN, generates an APR table entry if the VLAN information is the certain appointed VLAN, and synchronizes the ARP table entry to the switching chip.
The specific process of generating the ARP table entry is as follows: the CPU parses out an interface, a sending end IP address, and a sending end MAC address from the ARP message, and generates an ARP entry, where the output interface is a GE port (e.g., G1 in fig. 3) through which the switching chip receives the ARP message.
In the process, the PON chip of the OLT equipment sends the ARP message to the host CPU through the switching chip, so that the impact of the ARP message on the host CPU is avoided, and the impact on the CPU is reduced based on the speed limit and anti-attack functions realized by the switching chip.
In executing step S201: before the switch chip receives the ARP packet through the first chip port connected to the first PON chip, the method provided in the embodiment of the present invention further includes the following steps, as shown in fig. 4:
s401: and the first PON chip receives the ARP message through the first PON port.
Specifically, the first PON port P11 of the first PON chip receives the ARP packet from the ONU.
S402: the first PON chip finds a first redirection table item matched with the first PON port, and forwards the ARP message to the first chip port of the exchange chip according to the appointed output interface of the first redirection table item.
After the first PON chip receives the ARP packet from the network device, no other processing is performed on the ARP packet, but the ARP packet is further forwarded to the switch chip, specifically, the first PON chip first finds a first redirection table entry matched with the first PON port P11, and then forwards the ARP packet to the switch chip according to an specified egress interface of the first redirection table entry, that is, an egress interface G1 corresponding to the PON port P11.
In addition, the method provided by the embodiment of the present invention further includes the following steps, as shown in fig. 5:
s501: and the switching chip receives the Ethernet data message through a second chip port connected with the second PON chip.
The switching chip can receive the ethernet data packet via the second chip port P21 of the second PON chip connected thereto.
S502: the switching chip determines that the source MAC address of the Ethernet data message is the MAC address of the ARP table entry, adds a second chip port identification and a Q-in-Q label to the Ethernet data message, and sends the Ethernet data message with the second chip port identification and the Q-in-Q label to the CPU.
And the port of the exchange chip of the OLT equipment, which receives the Ethernet data message, is inconsistent with the output port of the ARP table entry matched with the source MAC address of the Ethernet message, and the ARP table entry is actively triggered to update when the ONU is judged to migrate.
S503: the CPU carries out security authentication on the Q-in-Q label of the Ethernet data message, determines that the security authentication is passed, and searches a matched ARP table entry based on the source MAC address of the Ethernet data message; and updating the output port of the ARP table entry as a second chip port.
The CPU carries out security authentication on the VLAN information of the Q-in-Q label of the Ethernet data message, namely, the CPU searches whether the VLAN information of the Q-in-Q label of the Ethernet data message is a preset security VLAN according to a preset security authentication list.
Specifically, after receiving an Ethernet data message which is sent by an exchange chip and added with a Q-in-Q label and an identifier of a second chip port P21, a CPU carries out security authentication according to outer layer VLAN information in the added Q-in-Q label, namely, judges whether the VLAN information is a specified certain VLAN, and if yes, searches a matched ARP table entry based on a source MAC address of the Ethernet data message; the output port of the ARP entry is updated to the second chip port P21.
S504: and the CPU synchronizes the ARP table entry updated by the output port to the switching chip.
By the method shown in fig. 5, when the ONU device migrates at the PON ports of different PON chips of the OLT device, the switch chip of the OLT device determines that ONU migration occurs based on the data message, and actively triggers an ARP entry update without waiting for the ARP entry triggered by the ARP message of the ONU device, thereby avoiding the problem of loss of the downstream three-layer flow message due to the fact that the ARP entry port of the migrated ONU is not updated.
Before step S501 shown in fig. 5, the method further comprises the following steps, as shown in fig. 6:
s601: and the second PON chip receives the Ethernet data message through the second PON port.
Specifically, the second PON port P21 of the second PON chip receives the incoming and ethernet data packets through the optical network unit ONU.
S602: the second PON chip finds a second redirection table item matched with the second PON port, and forwards the Ethernet data message to a second chip port of the exchange chip according to the appointed output interface of the second redirection table item.
After the second PON chip receives the ethernet data packet, it further finds a second redirection table entry matching the second PON port P21, and then forwards the ARP packet to the switch chip according to the specified egress interface of the second redirection table entry, i.e. the egress interface G5 corresponding to the PON port P21.
In the invention, when the exchange chip detects that the ONU equipment migrates according to the data message, the data message is sent to the CPU, the CPU is triggered to update the ARP table entry of the migrated ONU equipment, and then the CPU synchronizes the updated ARP table entry into the exchange chip, thus avoiding the impact of the ARP message on the CPU of the host and actively triggering the update of the ARP table entry of the migrated ONU. Therefore, the loss of the downlink three-layer flow message caused by the fact that the migrating ONU equipment does not actively send the ARP message is avoided.
An embodiment of the present invention further provides a communication device applied as an OLT, and as shown in fig. 7, the communication device includes: two or more PON chips, for example: a first PON chip 711 and a second PON chip 712); a switch chip 72, and a CPU 73.
The switching chip 72 receives the ARP packet through a first chip port connected to the first PON chip 711; the switching chip 72 adds a first chip port identifier and a Q-in-Q label to the ARP message, and sends the ARP message with the first chip port identifier and the Q-in-Q label to the CPU 73; the CPU73 carries out security authentication on VLAN information of a Q-in-Q label of the ARP message, determines that the VLAN information passes the security authentication, generates an ARP table entry according to the first chip port identification and the ARP message, and synchronizes the generated ARP table entry to the switching chip 72; the MAC address and the IP address of the ARP table entry are respectively the MAC address and the IP address of a sending end of the ARP message; the output port of the ARP table entry is a first chip port.
In this embodiment, the first PON chip 711 receives an ARP packet through the first PON port; the first PON chip 711 finds a first redirection table entry matching the first PON port, and forwards the ARP packet to the first chip port of the switch chip 72 according to the specified egress interface of the first redirection table entry.
The switch chip 72 receives the ethernet data packet through a second chip port connected to the second PON chip 712; the switching chip 72 determines that the source MAC address of the ethernet data packet is the MAC address of the ARP entry, adds a second chip port identifier and a Q-in-Q tag to the ethernet data packet, and sends the ethernet data packet with the second chip port identifier and the Q-in-Q tag to the CPU 73; the CPU73 carries out security authentication on the Q-in-Q label of the Ethernet data message, determines that the security authentication is passed, and finds out a matched ARP table entry based on the source MAC address of the Ethernet data message; updating the output port of the ARP table entry into a second chip port; the CPU73 synchronizes the ARP table entry for which the egress port is updated to the switch chip 72.
The second PON chip 712 receives the ethernet data packet through the second PON port; the PON chip finds a second redirection table entry matching the second PON port, and forwards the ethernet data packet to the second chip port of the switch chip 72 according to the specified egress interface of the second redirection table entry.
The CPU73 carries out security authentication on the VLAN information of the Q-in-Q label of the ARP message, namely, the CPU73 searches whether the VLAN information of the Q-in-Q label of the ARP message is a preset security VLAN according to a preset security authentication list; the CPU73 performs security authentication on the VLAN information of the Q-in-Q tag of the ethernet data packet means that the CPU73 searches whether the VLAN information of the Q-in-Q tag of the ethernet data packet is a predetermined secure VLAN according to a preset security authentication list.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the above-described device may refer to the corresponding process in the foregoing method embodiment, and is not described herein again. The communication device provided by the embodiment of the present invention has the same technical features as the ARP entry generation method provided by the above embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
In the description of the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are used for illustrating the technical solutions of the present invention, but not for limiting the same, and therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. An ARP entry generation method, comprising:
the exchange chip receives the ARP message through a first chip port connected with the first PON chip;
the exchange chip adds a first chip port identification and a Q-in-Q label to the ARP message, and sends the ARP message with the first chip port identification and the Q-in-Q label to a CPU;
the CPU carries out security authentication on VLAN information of a Q-in-Q label of the ARP message, determines that the VLAN information passes the security authentication, generates an ARP table entry according to the first chip port identification and the ARP message, and synchronizes the generated ARP table entry to the exchange chip;
wherein, the MAC address and the IP address of the ARP table entry are respectively the MAC address and the IP address of the sending end of the ARP message; and the output port of the ARP table entry is the first chip port.
2. The method of claim 1, wherein before the switch chip receives the ARP packet through the first chip port connected to the first PON chip, the method further comprises:
the first PON chip receives the ARP message through a first PON port;
the first PON chip finds out a first redirection table item matched with the first PON port, and forwards the ARP message to a first chip port of the exchange chip according to a specified output interface of the first redirection table item.
3. The method of claim 1, further comprising:
the switching chip receives the Ethernet data message through a second chip port connected with a second PON chip;
the exchange chip determines that the source MAC address of the Ethernet data message is the MAC address of the ARP table entry, adds a second chip port identifier and a Q-in-Q label to the Ethernet data message, and sends the Ethernet data message with the second chip port identifier and the Q-in-Q label to the CPU;
the CPU carries out security authentication on the Q-in-Q label of the Ethernet data message, determines that the Ethernet data message passes the security authentication, and finds the matched ARP table entry based on the source MAC address of the Ethernet data message; updating the output port of the ARP table entry to the second chip port;
and the CPU synchronizes the ARP table entry updated by the output port to the switching chip.
4. The method of claim 3, wherein before the switch chip receives the Ethernet data packet through the second chip port connected to the second PON chip, the method further comprises:
the second PON chip receives the Ethernet data message through a second PON port;
the PON chip finds a second redirection table item matched with the second PON port, and forwards the Ethernet data message to a second chip port of the exchange chip according to the appointed output interface of the second redirection table item.
5. The method of claim 4,
the CPU carries out security authentication on the VLAN information of the Q-in-Q label of the ARP message, namely, the CPU searches whether the VLAN information of the Q-in-Q label of the ARP message is a preset security VLAN according to a preset security authentication list;
the CPU carries out security authentication on the VLAN information of the Q-in-Q label of the Ethernet data message, namely, the CPU searches whether the VLAN information of the Q-in-Q label of the Ethernet data message is a preset security VLAN according to the preset security authentication list.
6. A communication device, comprising: more than two PON chips, a switching chip and a CPU;
the exchange chip receives the ARP message through a first chip port connected with a first PON chip;
the exchange chip adds a first chip port identification and a Q-in-Q label to the ARP message, and sends the ARP message with the first chip port identification and the Q-in-Q label to a CPU;
the CPU carries out security authentication on VLAN information of a Q-in-Q label of the ARP message, determines that the VLAN information passes the security authentication, generates an ARP table entry according to the first chip port identification and the ARP message, and synchronizes the generated ARP table entry to the exchange chip;
wherein, the MAC address and the IP address of the ARP table entry are respectively the MAC address and the IP address of the sending end of the ARP message; and the output port of the ARP table entry is the first chip port.
7. The communication device of claim 6,
the first PON chip receives the ARP message through a first PON port;
the first PON chip finds out a first redirection table item matched with the first PON port, and forwards the ARP message to a first chip port of the exchange chip according to a specified output interface of the first redirection table item.
8. The communication device of claim 6,
the switching chip receives the Ethernet data message through a second chip port connected with a second PON chip;
the exchange chip determines that the source MAC address of the Ethernet data message is the MAC address of the ARP table entry, adds a second chip port identifier and a Q-in-Q label to the Ethernet data message, and sends the Ethernet data message with the second chip port identifier and the Q-in-Q label to the CPU;
the CPU carries out security authentication on the Q-in-Q label of the Ethernet data message, determines that the Ethernet data message passes the security authentication, and finds the matched ARP table entry based on the source MAC address of the Ethernet data message; updating the output port of the ARP table entry to the second chip port;
and the CPU synchronizes the ARP table entry updated by the output port to the switching chip.
9. The communication device of claim 8,
the second PON chip receives the Ethernet data message through a second PON port;
the PON chip finds a second redirection table item matched with the second PON port, and forwards the Ethernet data message to a second chip port of the exchange chip according to the appointed output interface of the second redirection table item.
10. The communication device of claim 9,
the CPU carries out security authentication on the VLAN information of the Q-in-Q label of the ARP message, namely, the CPU searches whether the VLAN information of the Q-in-Q label of the ARP message is a preset security VLAN according to a preset security authentication list;
the CPU carries out security authentication on the VLAN information of the Q-in-Q label of the Ethernet data message, namely, the CPU searches whether the VLAN information of the Q-in-Q label of the Ethernet data message is a preset security VLAN according to the preset security authentication list.
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