Avaya 8800 Planning And Engineering, Network Design page 114

Layer 3 network design
Figure 40: VRRP with BackupMaster
Avaya recommends that you use a VRRP BackupMaster configuration with any SMLT configuration
that has an existing VRRP configuration.
The VRRP BackupMaster uses the VRRP standardized backup switch state machine. Thus, VRRP
BackupMaster is compatible with standard VRRP.
When implementing VRRP, follow the Avaya recommended best practices:
• Do not configure the virtual address as a physical interface that is used on any of 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
• Set the VRRP hold down timer long enough such that the IGP routing protocol has time to
converge and update the routing table. In some cases, setting the VRRP hold down timer to a
minimum of 1.5 times the IGP convergence time is sufficient. For OSPF, Avaya recommends
that you use a value of 90 seconds if using the default OSPF timers.
June 2016 Planning and Engineering — Network Design
Comments on this document? infodev@avaya.com
114