VRRP implementation on ACs

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.

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