3Com 3500 - page 492

492 CHAPTER 17: VIRTUAL ROUTER REDUNDANCY (VRRP)
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ip vrrp define For CoreBuilder 9000: Applies to Layer 3 switching modules only.
Defines a virtual router on the system.
Valid Minimum Abbreviation
ip v def
Important Considerations
■Authentication passwords can be up to eight alphanumeric
characters.
Primary Routers ■You can define one Primary router per VLAN.
■Primary routers own the IP addresses that you associate with a virtual
router.
■When you define a Primary virtual router, the possible VLANs that you
can select are the IP VLANs on the router that have no virtual routers
configured.
■The virtual router ID (VRID) must be unique across all locally attached
LAN segments and unique for the local router.
■When you define a Primary virtual router, you cannot use the VRID of
a virtual router that is already defined on the system or the VRID of a
neighboring VRRP router.
Backup Routers ■Backup routers back up the primary router of a specified virtua l router
and assume Master state responsibilities for the virtual router should
the primary router fail.
■When you define a Backup virtual route r, you cannot use the VRID of a
primary router that is defined on the system. You cannot define a
Primary and Backup VRRP router for the same v irtual router on the
same routing device.
Address Mode ■In auto-learn mode, systems learn the IP addresses to associate
with the specified VRID.
■In IP address mode, the system prompts you to select the interface
index from a lis t.
■After a reboot, the address learning process restarts for each virtual
router in auto-learn address mode.
■When you define a Primary virtual router, selecting auto-learn as
the address mode automatically adds all IP addresses that are
associated with the selected VLAN to the primary virtual router.