Design Reference

enable BackupMaster on the backup router, the backup router no longer switches traffic to the
VRRP Master. Instead the BackupMaster routes all traffic received on the BackupMaster IP
interface according to the switch routing table.
Figure 17: VRRP with BackupMaster
Avaya recommends that you stagger VRRP instances on a network or subnet basis. The
following figure shows the VRRP Masters and BackupMasters for two subnets. For more
information about how to configure VRRP using ACLI and Enterprise Device Manager (EDM),
see Avaya Virtual Services Platform 4000 Configuration — IP Routing, NN46251-505.
Figure 18: VRRP network configuration
The VRRP BackupMaster uses the VRRP standardized backup switch state machine. Thus,
VRRP BackupMaster is compatible with standard VRRP.
Avaya recommends that you use the following best practices to implement VRRP:
• Do not configure the virtual address as a physical interface that is used on the routing
switches. Instead, use a third address, for example:
- Interface IP address of VLAN A on Switch 1 = x.x.x.2
- Interface IP address of VLAN A on Switch 2 = x.x.x.3
- Virtual IP address of VLAN A = x.x.x.1
Note:
Avaya does not support a VRRP virtual IP address to be the same as the local physical
address of the device.
• Configure the VRRP hold down timer long enough that the Interior Gateway Protocol
(IGP) routing protocol has time to converge and update the routing table. In some cases,
Layer 3 network design
58 Network Design Reference for Avaya VSP 4000 February 2014
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