Configuring Association Between VRRP and a Card
Context
If uplink outbound interfaces of a VRRP group are located on the same card, the card reset may cause a failure to forward user traffic because there is no outbound interface. In this situation, a VRRP active/standby switchover must be performed. The link monitored by BFD is normal and the BFD session does not go Down, so the millisecond-level switching performance cannot be ensured. After a BFD session is associated with a card and the card is reset, the BFD session immediately goes Down, triggering a VRRP active/standby switchover. The switching performance is therefore improved.
Assume that a switch is the master of VRRP group 1 and backup of VRRP group 2 in VRRP load sharing scenarios. When the BFD session goes Down, a backup assumes the master role in VRRP groups 1 and 2 and sends VRRP Advertisement packets and gratuitous ARP packets, affecting packet forwarding on the Layer 2 switch at the access layer. The traffic from users to the network is forwarded to the new master of a VRRP group, but the card of the new master cannot forward traffic. Consequently, user packets are discarded.
After VRRP is associated with a card and the card is reset, the switch is disabled from sending VRRP Advertisement packets and gratuitous ARP packets, preventing incorrect VRRP active/standby switchover.
The device supports this command only when the MPU is equipped with the LE0MFSUA or the MPU is MPUE.