Supermicro SSE-G24-TG4 Configuration Manual page 30

Switch A (SW-A)
VR1 - Backup, VR2 - Master
Client1
Gateway = SW-A
Figure IP-4: VRRP
An alternative to dynamic discovery protocols is to statically configure a default router on the client. This
approach simplifies client configuration and processing but creates a single point of failure. If the default
gateway fails, the LAN client is limited to communicating only on the local IP network segment and is cut
off from the rest of the network.
VRRP can solve the static configuration problem. VRRP enables a group of routers to form a single virtual
router. The LAN clients can then be configured with the virtual router as their default gateway.
Virtual Router Redundancy Protocol (VRRP) is an election protocol that dynamically assigns
responsibility for one or more virtual routers to the VRRP routers on a LAN, allowing several routers on a
multi-access link to utilize the same virtual IP address. In a VRRP configuration, one router is elected as
the virtual router master with the other routers acting as backups in case the virtual router master fails.
1.7.1.1 Priority
The VRRP priority determines the role of each VRRP router. If a VRRP router owns the virtual IP address
and the IP address of the physical interface, this router functions as the master. The priority of the
Client2
Gateway = SW-B
Supermicro L2/L3 Switches Configuration Guide
Switch B (SW-B)
VR1 – Master, VR2 - Backup
Client3
Gateway = SW-A
Client4
Gateway = SW-B
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