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BGP Conditional Advertisement With 2 Subnets

Is it possible to trigger conditional advertisement of a Border Gateway Protocol (BGP) prefix based upon the non-existence of two subnets? I can only get this to work with one subnet.

My customer has parallel links to a provider (one BGP session).

The command reference mentions one subnet in the description of the non-exist-map.

Perhaps I should just identify one network from this Internet Service Provider (ISP) to focus on as the indicator of the failure.

1 REPLY
Anonymous
N/A

Re: BGP Conditional Advertisement With 2 Subnets

An IP address match is mandatory for a non-exist-map. The access-list specified should be a simple access-list and contains only one prefix. If the condition requires multiple prefixes, multiple access-list can be used, for example:

route-map ISP1-backbone permit 10

match ip address 2 3 4

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