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Chapter 12 Avaya P330 Layer 3 Features
144 Avaya P334T-ML User’s Guide
• The virtual router IP address needs to be configured as Default Gateway on the
stations
• The MAC which will be advertised by the Main router as a response to the
stations ARP requests, will be a 6 bytes Virtual MAC address in the format
00.00.5E.00.01.VRID.
• In the meantime, the redundant router will use a VRRP polling protocol (not
ping as in SRRP) to check the Main router integrity in one second intervals
(default). Otherwise it will be idle.
• If the Main router fails, a redundant router that has not received a response
from four consecutive polling requests (default) will take over and start to
advertise the same Virtual MAC for the ARP requests. Therefore the stations
will not ‘sense’ any change neither in the configured DG nor in the MAC level.
• VRRP has no provisions for routing data base synchronization among the
redundant routers. You need to perform this manually.
Case #2
• One router is Main on one IP subnet (e.g. 20.20.20.0) and redundant on another
(e.g. 30.30.30.0)
• In this case each IP subnet must be in different VRID (e.g. 1 & 2)
• The above detailed information is valid for each router in its Main/Redundant
roles.
VRRP CLI Commands
In order to... Use the following command...
Enable or disable VRRP routing
globally
router vrrp
Create or delete a virtual router on
the interface
ip vrrp
Assign or remove an IP address to
the virtual router
ip vrrp address
Set the virtual router advertisement
timer value (in seconds) for the
virtual router ID
ip vrrp timer
Set the virtual router priority value
used when selecting a master route
ip vrrp priority