Vrrp And Icmp Redirect Messages - Avaya 8800 Planning And Engineering

Layer 3 network design
Figure 42: VRRP and STG configurations
In this figure, configuration A is optimal because VRRP convergence occurs within 2 to 3
seconds. In configuration A, three STGs are configured and VRRP runs on the link between
the two routers (R). STG 2 is configured on the link between the two routers, which separates
the link between the two routers from the STGs found on the other devices. All uplinks are
active.
In configuration B, VRRP convergence takes between 30 and 45 seconds because it depends
on spanning tree convergence. After initial convergence, spanning tree blocks one link (an
uplink), so only one uplink is used. If an error occurs on the uplink, spanning tree reconverges,
which can take up to 45 seconds. After spanning tree reconvergence, VRRP can take a few
more seconds to failover.
Rather than configuring STG with VRRP, Avaya recommends that you enable SMLT with VRRP
to simplify the network configuration and reduce the failover time. For more information about
VRRP and SMLT, see
page 83.

VRRP and ICMP redirect messages

You can use VRRP and Internet Control Message Protocol (ICMP) in conjunction. However,
doing so may not provide optimal network performance.
122 Planning and Engineering — Network Design
SMLT and Layer 3 traffic Redundant Default Gateway: VRRP on
November 2010