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BGP and BGP4+ Introduction
Software Reference Supplement for SwitchBlade® x8112, x908, x900 and x610 Series Switches
C613-50032-01 REV D AlliedWare Plus
TM
Operating System - Software Version 5.4.3-2.6 1.37
How to adjust the eBGP advertisement interval
When a route advertised by BGP changes, BGP sends an Update message. If an advertised
route is flapping, and becomes unavailable. Route flapping is often caused when an
interface is unstable, and a flood of Update messages will occur. One approach to control
the flooding of BGP messages is to configure the advertisement interval. With the default
interval value of 30 seconds for eBGP neighbors, BGP routing updates are sent only every
30 seconds, even if a route is flapping many times during this 30 second interval.
To assign a different advertisement-interval value for eBGP peers, use the following
command in Router Configuration mode::
Use this command instead of the neighbor as-origination-interval (BGP and BGP4+)
command for eBGP peers with prefixes not in the same AS for updates not in a local AS.
How to adjust the iBGP advertisement interval
With the default value of 5 seconds for iBGP neighbors, BGP routing updates are sent only
every 5 seconds, even if a route is flapping many times during this 5 second interval.
To assign a different advertisement-interval value for iBGP peers, use the following
command in Router Configuration mode: :
BGP dampening can also be used to control the effects of flapping routes. See the BGP
and BGP4+ Route Dampening section in this chapter, and the bgp dampening (BGP
and BGP4+) command in the BGP and BGP4+ Commands chapter for more information.
intro_bgp4+_3.eps
Router ID 10.10.10.11 Router ID 10.10.10.12
AS200 AS300
Router 1
2001:db8::80:1
Router 2
2001:db8::80:2
eBGP 30 second
advertisement
interval
awplus(config-router)#
neighbor <neighborid>
advertisement-interval <time>
This command sets the minimum interval between sending
eBGP routing updates with a 30 second eBGP default interval.
intro_bgp4+_2
Router ID 10.10.10.11 Router ID 10.10.10.12
AS200
Router 1
fe80::1
Router 2
fe80::2vlan1
vlan2
advertisement
iBGP 5 second
interval
awplus(config-router)#
neighbor <neighborid>
advertisement-interval <time>
This command sets the minimum interval between sending
eBGP routing updates with a 5 second iBGP default interval.