Virtual router (VR)

A VR instance consists of one owner router and one or more backup routers belonging to the same network. Any VR instance exists within a specific VLAN, and all members of a given VR must belong to the same subnet. In a multinetted VLAN, multiple VRs can be configured. The owner operates as the VR's master unless it becomes unavailable, in which case the highest-priority backup becomes the VR's master.

A VR includes the following:

  • VR identification (VRID) configured on all VRRP routers in the same network or, in the case of a multinetted VLAN, on all routers in the same subnet .

  • Same VIP configured on each instance of the same VR.

  • Satus of either owner or backup configured on each instance of the same VR (on a given VR, there can be one owner and one or more backups.)

  • Priority level configured on each instance of the VR (on the owner router the highest priority setting, 255, is automatically fixed; on backups, the default priority setting is 100 and is configurable.)

  • VR MAC address (not configurable.)

Where a VLAN is configured with only one network (IP address), one VR is allowed in that VLAN. In a multinetted VLAN, there can be one VR per subnet, with a maximum of 32 VRs (16 for the 2930F switch) in any combination of masters and backups.

NOTE:

All routers in a given VR must belong to the same network (or subnet, in the case of a multinetted VLAN.)