deploying 'bgp multi-path' on live network.

Unanswered Question
Oct 27th, 2009


I wonder if there is impact when we deploy the bgp 'multi-path' on live network.

It's simple, the configuration is inserted on router bgp config.

but we config the bgp multi path, the packet must not loss.

the thing what I know is that when I config the bgp multi path on live network, Is there a impact(packet loss or routing table confusion)?

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Giuseppe Larosa Tue, 10/27/2009 - 09:22

Hello Sung,

how many routes are in your BGP table?

you can check this with

sh ip bgp sum

It is true that you only need to add one statement to configuration to make the change but the consequences of this are the following:

it triggers a recalculation of all BGP routes (it may happen at next BGP scan execution).

Then after BGP process proposes possible alternate paths these need to be installed in the IP routing table.

the CEF tables of the device nees to be updated too.

Again all this should cause just a peak in cpu usage and some more memory usage.

However, specially if the number of BGP IP prefixes is high I would ask a maintanance window for safety.

Hope to help



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