Alcatel-Lucent 6850-48 网络指南

Creating an RDP Interface

Configuring RDP

page 29-10

OmniSwitch AOS Release 6 Network Configuration Guide

To set the minimum amount of time, in seconds, that the RDP will allow between advertisements, use the

 command. For example, the following 

command sets this value to 500 seconds for the Marketing IP router interface:

-> ip router-discovery interface Marketing min-advertisement-interval 500

Make sure that the value specified with this command is less than the current maximum advertisement 
interval value. By default, this value is set to 0.75 * the default maximum interval value (450 seconds if 
the maximum interval is set to its default value of 600 seconds).

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

 command. For example, the following command 

sets this value to 3000 seconds for RDP packets sent from the Marketing IP router interface:

-> ip router-discovery interface Marketing 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). 

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

 command. For example, the following command sets this 

value to 10 for the IP address associated with the Marketing IP router interface:

-> ip router-discovery interface Marketing 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 low preference levels to discourage selection of a specific router.