VRRP implementation on ACs

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Virtual Router Redundancy Protocol (VRRP) on ACs:

VRRP integrates multiple routing devices into a virtual router and uses the next-hop address as the IP address of the virtual router. VRRP elects a new gateway to transmit data traffic if the next-hop gateway of hosts fails, ensuring reliable network communication.

With the rapid development of WLANs and diversification of applications, various value-added services (VASs) such as Internet Protocol television (IPTV) and video conferencing are prevailing. Any interruptions to network services may cause significant loss to users, resulting in the increase of user demands for network reliability.

Generally, all hosts on the same network segment have the same default route with the gateway address as the next-hop address. Hosts use the default route to send packets to the gateway and the gateway forwards the packets to other network segments. When the gateway fails, the hosts on the network segment using the same default route cannot communicate with external networks. More than one egress gateway can be configured to enhance system reliability. However, route selection between the gateways becomes an issue.

VRRP solves the problem. VRRP virtualizes multiple routing devices into a virtual router without changing the networking. The next-hop address in the default route of hosts is used as the IP address of the virtual router for gateway backup. If the gateway is faulty, VRRP elects a new gateway to transmit service traffic to ensure reliable network communication.

For implementation of VRRP, see AC6605&AC6005&ACU2 Product Documentation. In the document, choose Configuration > CLI-based Configuration > Reliability Configuration Guide > VRRP Configuration > Principles.

Other related questions:
VRRP configuration on an AC
For details about how to configure VRRP on an AC, see http://support.huawei.com/ehedex/pages/DOC1000088060DEE1226D/06/DOC1000088060DEE1226D/06/resources/dc/dc_cfg_vrrp_0041.html?ft=0&id=dc_cfg_vrrp_0041 of the AC in V200R006.

VRRP implementation principle and basic functions of an S series switch
S series switches (S1700 excluded) support the VRRP function. Virtual Router Redundancy Protocol (VRRP) integrates multiple routing devices into a virtual routing device, and the IP address of the virtual routing device is used as the default gateway address to communicate with external networks. When the gateway is faulty, VRRP can select a new gateway to transmit data traffic, ensuring network reliability. The working process of VRRP is as follows: 1. The VRRP group selects a new master based on the priorities of devices. The master sends gratuitous ARP packets to notify the connected network devices or hosts of the virtual MAC address of the VRRP group, and forwards packets to the virtual IP address. 2. The master periodically sends VRRP Advertisement packets to all backup devices in the VRRP group to advertise its configurations (such as the priority) and operating status. 3. If the master is faulty, VRRP elects a new master from the VRRP group based on priorities. 4. After a VRRP master/backup switchover, the new master sends gratuitous ARP packets carrying the virtual MAC address and virtual IP address of the virtual router to update the MAC address entry on the connected host or device. The user traffic is then switched to the new master. 5. If the original master recovers and is the IP address owner (its priority is 255), it immediately switches to the Master state. If the original device has a priority less than 255, it will switch to the Backup state first, and recover its priority to the previously configured priority before the faulty occurs. 6. If a backup router's priority is higher than the master router's priority, VRRP determines whether to re-elect a new master, depending on the backup router's working mode (preemption or non-preemption).

Can the VPLS feature of the switch implement isolation between ACs
The VPLS feature of the switch cannot implement isolation between ACs.

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