Avaya Cajun P580, User Manual, Page: 402 / 770

12-86 User Guide for the Avaya P580 and P882 Multiservice Switches, v6.0
Chapter 12
If the Primary IP Address is changed so that it is no longer on the same
subnet as an associated virtual router, the virtual router will be deleted
Configuring IRDP
ICMP Router Discovery Protocol (IRDP) is an alternative router discovery
protocol using ICMP messages on multicast links. ICMP uses router
discovery messages, known as router advertisements and router
solicitations.
Each router periodically multicasts a router advertisement from each of its
multicast interfaces, announcing the IP address of that interface, and other
router IP addresses. Hosts discover the addresses of their neighbor routers
by listening for the advertisements. When a host attached to a link starts up,
it may multicast a router solicitation to ask for immediate advertisements,
rather than waiting for the next periodic one to arrive.
If no advertisements arrive, the host re-transmits the solicitation, but does
not send additional solicitations. Routers that subsequently start up, or were
not discovered because of packet loss or temporary link partitioning, are
eventually discovered by reception of their periodic (unsolicited)
advertisements.
Enabling IRDP on an Interface
You can enable IRDP on an interface using either the Web Agent or the
CLI.
Web Agent
Procedure
To enable IRDP on an interface using the Web Agent:
1. Select IRDP from the Routing > IP > Configuration group on the Web
Agent window. The ICMP Router Discovery Protocol dialog box
opens (
Figure 12-41 ).