CN106686657B - MLAG dual-homing access IP network link load balancing method - Google Patents
MLAG dual-homing access IP network link load balancing method Download PDFInfo
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- CN106686657B CN106686657B CN201611111471.5A CN201611111471A CN106686657B CN 106686657 B CN106686657 B CN 106686657B CN 201611111471 A CN201611111471 A CN 201611111471A CN 106686657 B CN106686657 B CN 106686657B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
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- 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
- H04L45/24—Multipath
- H04L45/245—Link aggregation, e.g. trunking
Abstract
The invention provides a link load balancing method of an MLAG dual-homing access IP network, which comprises the following two conditions: in the first case, the gateway has no abnormality and operates normally, and the method comprises the following steps: step one, starting ｃA three-layer routing interface on ｃA first converter, setting an IP address IP-A corresponding to an MAC address MAC-A, distributing ｃA network segment route of the IP-A to ｃA network side on the first converter, and forming an ECMP path to the network side; and step two, starting ｃA three-layer routing interface on the second converter, configuring an IP address IP-A corresponding to one MAC address MAC-B, distributing network segment routing of the IP-A to the network side on the second converter, and forming an ECMP path and the like for the network side. The invention realizes the load balance of the gateway link when the MLAG is dually accessed to the IP network by a simple mode, avoids introducing a new control protocol when the MLAG is dually accessed to the IP network, reduces the complexity of network configuration and operation and maintenance and the software development cost, and reduces the expense on the Peerlink when the MLAG is dually accessed to the IP network.
Description
Technical Field
The invention relates to a load balancing method, in particular to a load balancing method for MLAG dual-homing access IP network links.
Background
The MLAG (Multi-Chassis LAG, Multi-Chassis link aggregation) technology is a cross-device link aggregation technology, a main application scenario is a dual-homing access scenario, and the basic idea of the MLAG technology is to make two access switches perform link aggregation negotiation with an accessed device in the same state, and to the accessed device, it looks like that a link aggregation relationship is established with one device. The mechanism for realizing cross-device link aggregation can realize link aggregation among multiple devices, an MLAG is used as a logical link aggregation group, and entries at two ends of peer devices need to be kept consistent, and the entries at two ends of the MLAG need to be synchronized through Peerlink links (as shown in fig. 1).
When the MLAG double-homing is accessed to the IP network, the double-homing device becomes a demarcation point of a two-layer network and a three-layer network, namely, the double-homing device plays a role of a gateway. Because two devices are used as gateways, the two devices must display the same gateway IP to the user side and present an Active-Active mode to the access device so as to support the load balancing of the MLAG link. The existing solution is that the MLAG couples to the VRRP mechanism, and at the same time, modifies the VRRP protocol, and makes the device running the VRRP protocol work in a dual-master state, and only borrows the virtual IP and MAC mechanism of the VRRP, so that the gateway device presents the same gateway IP and MAC to the access device in an Active-Active mode, thereby implementing link load balancing (as shown in fig. 2). The solution has the defects that equipment at two ends of a peer needs to run a VRRP protocol in an MLAG dual-homing access IP network environment, and the VRRP protocol is modified, so that the software development implementation cost and the network configuration and operation and maintenance complexity are improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a link load balancing method for an MLAG dual-homing access IP network, which realizes the load balancing of a gateway link when the MLAG is dual-homing accessed to the IP network through a simple mode, avoids introducing a new control protocol when the MLAG is dual-homing accessed to the IP network, reduces the complexity of network configuration and operation and maintenance and software development cost, and reduces the expense on a Peerlink when the MLAG is dual-homing accessed to the IP network.
According to an aspect of the present invention, there is provided a method for link load balancing of an MLAG dual-homing IP network, which is characterized by including the following two cases:
in the first case, the gateway has no abnormality and operates normally, and the method comprises the following steps:
step A, starting ｃA three-layer routing interface on ｃA first converter, setting an IP address IP-A corresponding to ｃA first MAC address, distributing ｃA network segment route of the IP-A to ｃA network side on the first converter, and forming an ECMP path for the network side;
step A, starting ｃA three-layer routing interface on ｃA second converter, configuring an IP address IP-A corresponding to ｃA second MAC address, distributing ｃA network segment route of the IP-A to ｃA network side on the second converter, and forming an ECMP path for the network side;
step A, avoiding ARP table item conflict corresponding to the IP-A between the first converter and the second converter;
step A, the access side equipment sets an exit gateway as IP-A, when the access side equipment routes to ｃA first converter side through LAG hash, the first converter can respond to an ARP request from the IP-A of the network side, the response MAC address is ｃA first MAC address, when the access side equipment routes to ｃA second converter side through LAG hash, the second converter can respond to the ARP request from the IP-A of the network side, and the response MAC address is ｃA second MAC address;
step A, when the access side equipment communicates with the network side, sending a data message of which the destination MAC is the first MAC address or the second MAC address to a first converter or a second converter of a gateway, wherein the first converter or the second converter of the gateway equipment can carry out three-layer routing on the message on an IP layer and send the message to the network side;
step A six, when the network side communicates with the access side equipment, the message is sent to ｃA first converter or ｃA second converter of the gateway equipment through an ECMP network segment route of IP-A, and the first converter or the second converter of the gateway equipment finds ｃA corresponding MLAG outlet according to an ARP table item of the access side to forward the message to the access equipment;
in case two, when the gateway is in the single active state due to an abnormal condition, the method comprises the following steps:
step B, the configuration of the access side equipment and the gateway is the same as that of the access side equipment;
step B, when the MLAG link of the second converter equipment and the access side equipment is abnormal, the gateway equipment presents a single-active state to the access side equipment;
step B, when the access side equipment communicates with the network side, sending a data message of which the destination MAC is the first MAC address or the second MAC address to a first converter of the gateway, wherein the first converter of the gateway equipment still carries out three-layer routing and sends the message to the network side on an IP layer;
step B, because the MLAG link of the second converter of the gateway equipment is failed but the network segment route of the IP-A still exists and is distributed to the network side, when the network side communicates with the equipment of the access side, the message is still sent to the first converter or the second converter of the gateway equipment through the ECMP network segment route of the IP-A, after the second converter of the gateway equipment receives the IP message, the message is sent to the first converter through the MLAG-Peerlink link connected with the first converter, and the message is sent to the equipment of the access side by the first converter;
and step B, after the MLAG link of the access side equipment and the second converter is recovered, the second converter and the first converter share the communication between the access side and the network side, and the communication mechanism is the same as that described in the case.
Preferably, the MLAG avoids introducing a new control protocol when it is dually accessed to the IP network.
Compared with the prior art, the invention has the following beneficial effects: the invention realizes the load balance of the gateway link when the MLAG is dually accessed to the IP network by a simple mode, avoids introducing a new control protocol when the MLAG is dually accessed to the IP network, reduces the complexity of network configuration and operation and maintenance and the software development cost, and reduces the expense on the Peerlink when the MLAG is dually accessed to the IP network.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of a conventional MLAG;
FIG. 2 is a schematic diagram of a conventional MLAG and VRRP dual-homing IP network;
FIG. 3 is a network diagram of the MLAG and statically configured gateway dual-homing IP of the present invention;
fig. 4 is a communication diagram when a gateway at one side of the present invention is in an abnormal single-active state.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 3 to fig. 4, the present invention provides a method for balancing link load of MLAG dual-homing IP network, which includes the following two cases:
in the first case, the gateway has no abnormality and operates normally, and the method comprises the following steps:
step A, starting ｃA three-layer routing interface on ｃA first converter, setting an IP address IP-A corresponding to ｃA first MediｃA Access Control (MAC) address MAC-A, distributing ｃA network segment route of the IP-A to ｃA network side on the first converter, and forming an ECMP path to the network side;
step A, starting ｃA three-layer routing interface on ｃA second converter, configuring an IP address IP-A corresponding to ｃA second MAC address MAC-B, distributing ｃA network segment route of the IP-A to ｃA network side on the second converter, and forming an ECMP (Equal-Cost Multi-Path) Path to the network side;
step A, avoiding ARP table item conflict corresponding to the IP-A between the first converter and the second converter;
step A, the access side equipment sets an exit gateway as IP-A, when the access side equipment routes to ｃA first converter side through LAG hash, the first converter can respond to an ARP request from the IP-A of the network side, the response MAC address is ｃA first MAC address MAC-A, when the access side equipment routes to ｃA second converter side through LAG hash, the second converter can respond to the ARP request from the IP-A of the network side, and the response MAC address is ｃA second MAC address MAC-B;
step A, when the access side equipment communicates with the network side, sending a data message of which the destination MAC is the first MAC address MAC-A or the second MAC address MAC-B to a first converter or a second converter of the gateway, wherein the first converter or the second converter of the gateway equipment can carry out three-layer routing on an IP layer on the message (the destination MAC is the first MAC address MAC-A or the second MAC address MAC-B) to be sent to the network side;
step A six, when the network side communicates with the access side equipment, the message is sent to the first converter or the second converter of the gateway equipment through the ECMP network segment route of the IP-A, and the first converter or the second converter of the gateway equipment finds the corresponding MLAG outlet according to the ARP (Address resolution protocol) table item of the access side and forwards the message to the access equipment.
In case two, when the gateway is in the single active state due to an abnormal condition, the method comprises the following steps:
step B, the configuration of the access side equipment and the gateway is the same as that of the access side equipment;
step B, when the MLAG link of the second converter equipment and the access side equipment is abnormal, the gateway equipment presents a single-active state to the access side equipment (only the first converter works);
step B, when the access side equipment communicates with the network side, sending a data message of which the destination MAC is the first MAC address MAC-A or the second MAC address MAC-B to the first converter of the gateway, wherein the first converter of the gateway equipment still carries out three-layer routing on an IP layer on the message (the destination MAC is the MAC-A or the MAC-B) and sends the message to the network side;
step B, because the MLAG link of the second converter of the gateway device fails but the network segment route of the IP-A still exists and is distributed to the network side, when the network side communicates with the access side device, the message is still sent to the first converter or the second converter of the gateway device through the ECMP (Equal-Cost Multi-Path) network segment route of the IP-A, after the second converter of the gateway device receives the IP message, the message is sent to the first converter through the MLAG-Peerlink link connected with the first converter, and then the message is sent to the access side device through the first converter;
and step B, after the MLAG link of the access side equipment and the second converter is recovered, the second converter and the first converter share the communication between the access side and the network side, and the communication mechanism is the same as that described in the case.
When the MLAG is dually accessed to the IP network, a new control protocol is avoided from being introduced, so that the complexity of network configuration and operation and maintenance and the software development cost are reduced.
In summary, the invention realizes gateway link load balancing when the MLAG is dually accessed to the IP network in a simple manner, avoids introducing a new control protocol when the MLAG is dually accessed to the IP network, reduces network configuration and operation and maintenance complexity and software development cost, and reduces the overhead on the Peerlink link when the MLAG is dually accessed to the IP network.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (2)
1. An MLAG dual-homing access IP network link load balancing method is characterized by comprising the following two conditions:
in the first case, the gateway has no abnormality and operates normally, and the method comprises the following steps:
step A, starting ｃA three-layer routing interface on ｃA first converter, setting an IP address IP-A corresponding to ｃA first MAC address, distributing ｃA network segment route of the IP-A to ｃA network side on the first converter, and forming an ECMP path for the network side;
step A, starting ｃA three-layer routing interface on ｃA second converter, configuring an IP address IP-A corresponding to ｃA second MAC address, distributing ｃA network segment route of the IP-A to ｃA network side on the second converter, and forming an ECMP path for the network side;
step A, avoiding ARP table item conflict corresponding to the IP-A between the first converter and the second converter;
step A, the access side equipment sets an exit gateway as IP-A, when the access side equipment routes to ｃA first converter side through LAG hash, the first converter can respond to an ARP request from the IP-A of the network side, the response MAC address is ｃA first MAC address, when the access side equipment routes to ｃA second converter side through LAG hash, the second converter can respond to the ARP request from the IP-A of the network side, and the response MAC address is ｃA second MAC address;
step A, when the access side equipment communicates with the network side, sending a data message of which the destination MAC is the first MAC address or the second MAC address to a first converter or a second converter of a gateway, wherein the first converter or the second converter of the gateway equipment can carry out three-layer routing on the message on an IP layer and send the message to the network side;
step A six, when the network side communicates with the access side equipment, the message is sent to ｃA first converter or ｃA second converter of the gateway equipment through an ECMP network segment route of IP-A, and the first converter or the second converter of the gateway equipment finds ｃA corresponding MLAG outlet according to an ARP table item of the access side to forward the message to the access equipment;
in case two, when the gateway is in the single active state due to an abnormal condition, the method comprises the following steps:
step B, the configuration of the access side equipment and the gateway is the same as that of the access side equipment;
step B, when the MLAG link of the second converter equipment and the access side equipment is abnormal, the gateway equipment presents a single-active state to the access side equipment;
step B, when the access side equipment communicates with the network side, sending a data message of which the destination MAC is the first MAC address or the second MAC address to a first converter of the gateway, wherein the first converter of the gateway equipment still carries out three-layer routing and sends the message to the network side on an IP layer;
step B, because the MLAG link of the second converter of the gateway equipment is failed but the network segment route of the IP-A still exists and is distributed to the network side, when the network side communicates with the equipment of the access side, the message is still sent to the first converter or the second converter of the gateway equipment through the ECMP network segment route of the IP-A, after the second converter of the gateway equipment receives the IP message, the message is sent to the first converter through the MLAG-Peerlink link connected with the first converter, and the message is sent to the equipment of the access side by the first converter;
and step B, after the MLAG link of the access side equipment and the second converter is recovered, the second converter and the first converter share the communication between the access side and the network side, and the communication mechanism is the same as that described in the case.
2. The method for link load balancing in the MLAG dual-homing IP network as claimed in claim 1, wherein the MLAG dual-homing access to the IP network avoids introducing a new control protocol.
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