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BGP and BGP4+ Introduction
Software Reference Supplement for SwitchBlade® x8112, x908, x900 and x610 Series Switches
1.32 AlliedWare Plus
TM
Operating System - Software Version 5.4.3-2.6 C613-50032-01 REV D
BGP Connections Reset
When a link between external neighbors drops, a BGP session does not reset immediately.
To reset a BGP session when an interface goes down, use this command in Router
Configuration mode
BGP Versions
By default, BGP sessions begin using BGP Version 4 and negotiate downward to earlier
versions as needed. To prevent negotiation and force the BGP version used to
communicate with a neighbor, use the command below in Router Configuration mode:
BGP Confederations
One way to reduce the iBGP mesh is to divide an autonomous system into multiple sub-
autonomous systems and group them into a single confederation. To the outside world,
the confederation looks like a single autonomous system.
Each autonomous system is fully meshed within itself, and has few connections to other
autonomous systems in the same confederation. Though peers in different autonomous
systems have eBGP sessions, they exchange routing information as iBGP peers.
To configure a BGP confederation, you must specify a confederation identifier. To the
outside world, the group of autonomous systems will look like a single autonomous
system with the confederation identifier as the autonomous system number. To configure
a BGP confederation identifier, use the following command in Router Configuration mode:
In order to treat the neighbors from other autonomous systems within the confederation
as special eBGP peers, use the following command in Router Configuration mode:
awplus(config-router)#
bgp fast-external-failover
This command resets BGP sessions automatically.
awplus(config-router)#
neighbor <neighborid> version
<version>
This command specifies the BGP version to use when
communicating with a neighbor.
awplus(router-config)#
bgp confederation identifier
<1-4294967295>
This command configures a BGP confederation.
awplus(router-config)#
bgp confederation peers
<1-4294967295>
This command specifies the autonomous systems that belong
to the confederation.