Setting The Advertisement Lifetime; Setting The Preference Levels For Router Ip Addresses - Alcatel OmniSwitch 6624 Network Configuration Manual
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Creating an RDP Interface
Setting the Advertisement Lifetime
The advertisement lifetime value indicates how long, in seconds, the router IP address contained in an
advertisement packet is considered valid by a host. This value is entered into the lifetime field of an adver-
tisement packet so that it is available to hosts that receive these types of packets.
If a host does not receive another packet from the same router before the lifetime value expires, it assumes
the router is no longer available and will drop the router IP address from its table. As a result, it is impor-
tant that the lifetime value is always greater than the current maximum advertisement interval to ensure
router transmissions occur before the lifetime value expires.
To set the advertisement lifetime value for packets transmitted from a specific RDP interface, use the
ip router-discovery interface advertisement-lifetime
sets this value to 3000 seconds for packets sent from the 17.255.10.2 router RDP interface:
-> ip router-discovery interface 17.255.10.2 advertisement-lifetime 3000
By default, the lifetime value is set to 3 * the current maximum interval value (1800 seconds if the maxi-
mum interval is set to its default value of 600 seconds).
Setting the Preference Levels for Router IP addresses
A preference level is assigned to each router IP address contained within an advertisement packet. Hosts
will select the IP address with this highest preference level to use as the default router gateway address. By
default, this value is set to zero.
To specify a preference level for IP addresses advertised from a specific RDP interface, use the
ip router-discovery interface preference-level
value to 10 for the 17.255.10.2 router RDP interface:
-> ip router-discovery interface 17.255.10.2 preference-level 10
Note that router IP address preference levels are only compared with the preference levels of other routers
that exist on the same subnet. Set preference levels low to discourage selection of a specific router.
page 14-10
command. For example, the following command
command. For example, the following command sets this
OmniSwitch 6624/6648 Network Configuration Guide
Configuring RDP
April 2004
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