3Com 3500 - Manual (Page 415)

ip interface icmpRouterDiscovery 415
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icmpRouterDiscovery
For CoreBuilder 9000: Applies to Layer 3 switching modules only.
Enables or disables Internet Control Message Protocol (ICMP) router
discovery, which enables hosts that are attached to multicast or broadcast
networks to discover the IP addresses of their neighboring routers and
determine which router to use for a default gateway.
Valid Minimum Abbreviation
ip i icmpro
Important Considerations
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ICMP router discovery can be set on a per-interface basis.
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When you enable the state for an interface, the system prompts you
for a preference. (See RFC 1256.) By default, this preference level is
0 .
Use the preference to control the use of certain routers as the default
router. The host uses the router with the highest preference level.
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An appropriately configured end station can locate one or more
routers on the LAN to which it is attached. The end station then
automatically installs a default route to each of the routers that are
running Internet Control Message Protocol (ICMP) router discovery.
You do not need to manually configure a default route. ICMP redirect
messages subsequently channel the IP traffic to the correct router.
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You can configure only certain end stations to work with the ICMP
router discovery protocol. See the documentation for your
workstation to determine whether you can configure it to work with
this protocol.
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You can configure and display three timers for ICMP router discovery
on the CoreBuilder 3500:
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Maximum advertisement interval — The maximum time
interval between advertisements.
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Minimum advertisement interval — The minimum time interval
between advertisements.
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Advertisement holdtime — The length of time that
advertisements are held valid.