Nortel Alteon OS 42C4911 Application Manual page 184

Alteon OS Application Guide
4. Configure BGP peer router 1 and 2.
Peer 1 is the primary gateway router. Peer 2 is configured with a metric of "3." The metric
option is key to ensuring gateway traffic is directed to Peer 1, as it will make Peer 2 appear to
be three router hops away from the switch. Thus, the switch should never use it unless Peer 1
goes down.
>> # /cfg/l3/bgp/peer 1
>> BGP Peer 1# ena
>> BGP Peer 1# addr 200.200.200.2
>> BGP Peer 1# if 200.200.200.1
>> BGP Peer 1# ras 100
>> BGP Peer 1# /cfg/l3/bgp/peer 2
>> BGP Peer 2# ena
>> BGP Peer 2# addr 210.210.210.2
>> BGP Peer 2# if 210.210.210.1
>> BGP Peer 2# ras 200
>> BGP Peer 2# metric 3
The metric command in the peer menu tells the GbE Switch Module to create an AS path of
"3" when advertising via BGP.
5. On the switch, apply and save your configuration changes.
>> BGP Peer 2# apply
>> save
184 Chapter 11: Border Gateway Protocol
(Select BGP peer router 1)
(Enable this peer configuration)
(Set IP address for peer router 1)
(Set IP interface for peer router 1)
(Set remote AS number)
(Select BGP peer router 2)
(Enable this peer configuration)
(Set IP address for peer router 2)
(Set IP interface for peer router 2)
(Set remote AS number)
(Set AS path length to 3 router hops)
(Make your changes active)
(Save for restore after reboot)
42C4911, January 2007