Ipv6 Vrrp - Avaya 8800 Planning And Engineering

Consider the network shown in the following figure. Traffic from the client on subnet 30.30.30.0,
destined for the 10.10.10.0 subnet, is sent to routing switch 1 (VRRP Master). This traffic is
then forwarded on the same subnet to routing switch 2 where it is routed to the destination.
For each packet received, Routing switch 1 sends an ICMP redirect message to the client to
inform it of a shorter path to the destination through routing switch 2.
Figure 43: ICMP redirect messages diagram
To avoid excessive ICMP redirect messages if network clients do not recognize ICMP redirect
messages, Avaya recommends the network design shown in the following figure. Ensure that
the routing path to the destination through both routing switches has the same metric to the
destination. One hop goes from 30.30.30.0 to 10.10.10.0 through routing switch 1 and routing
switch 2. Do this by building symmetrical networks based on the network design examples
presented in
Figure 44: Avoiding excessive ICMP redirect messages

IPv6 VRRP

For IPv6 hosts on a LAN to learn about one or more default routers, IPv6-enabled routers send
Router Advertisements using the IPv6 Neighbor Discovery (ND) protocol. The routers multicast
these Router Advertisements every few minutes.
Planning and Engineering — Network Design
Redundant network design
Virtual Router Redundancy Protocol
on page 55.
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