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Chapter 9
Cajun P550/P880/P882 Switch User Guide
Configuring ICMP Router Discovery Protocol
(IRDP)
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 multicast 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.
Enabling IRDP
on an Interface
Using the Web
Agent
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 (Figure9-35).