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Patch 86251-08 For Rapier Series Switches SHOW IP ADVERTISE 55
Patch 86251-08 for Software Release 2.5.1
C613-10356-00 REV I
See Also DISABLE IP DISCOVERY
DELETE IP DISCOVERY INTERFACE
ENABLE IP DISCOVERY
ADD IP DISCOVERY INTERFACE
SET IP DISCOVERY INTERFACE
Old Router Discover
Process
Before an IP host can send IP packets, it needs the IP address of a router that
can forward it to its destination. When router advertisements are enabled, the
router multicasts router advertisements periodically on any interfaces that are
configured to advertise. When hosts receive these messages, they store them
for the specified lifetime. They forward traffic to the IP address of the router
with the highest preference level specified in the router advertisement.
When a host first starts up, it may send one, or a small number of router
solicitations to prompt a quicker router advertisement, instead of waiting for
the next router advertisement to arrive automatically. When the router receives
a router solicitation with an IP address, it immediately multicasts an early
router advertisement.
For the first few advertisements sent from an interface (up to 3), if the
randomly chosen interval is greater than 16 seconds, the router sends the
router advertisements at intervals of at most 16 seconds. After these initial
transmissions, it sends router advertisements at random intervals between the
minimum and maximum intervals that the user configures, to reduce the
probability of synchronization with the advertisements from other routers on
the same link.
If either an interface, or router advertisements on an interface are disabled, the
router sends a final multicast advertisement on the interface with a lifetime
field of zero. If some of the IP addresses have advertising disabled, while
others continue to advertise, the router sends a router advertisement
containing the remaining IP addresses.
The router does not behave as a Router Discovery host to discover other
routers on the LAN; it discards any router advertisements that it receives from
other routers.
IP Address An IP address assigned to the interface.
Advertise Whether the address for this logical interface should
be advertised.
Preference Level The preferability of the address as a default router
address relative to other router addresses on the
same subnet.
Table 10: Parameters displayed in the output of the SHOW IP ADVERTISE
command. (Continued)
Parameter Meaning