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Aggreate Routes for eBGP export.

Posted: Tue Aug 30, 2016 2:47 pm
by quemlar
Hi Folks,

Quick question.
I have 3 eBGP peers same subnets are advertised to all.
I have to aggregate networks for eBGP export.
I created aggregated networks and assigned to instance for peer A and peer B see below, then I noticed I didn't need to create any for Peer C.
My question is, does the aggregate route only need to be configured once and can be assigned to BGP default instance?
Or should I just advertise complete networks manually and not use route aggregation?
/routing bgp aggregate
add include-igp=yes instance="peerA" prefix=XX.XX.35.0/24
add include-igp=yes instance="peerB" prefix=XX.XX.35.0/24
Would
add include-igp=yes instance="default" prefix=XX.XX.35.0/24 suffice.
It's a live network so hesitant to change anything during business hours.
On JunOS I only config the aggregate route once.
set routing-options aggregate route XX.XX.35.0/24
Thanks,
Q.

Re: Aggreate Routes for eBGP export.

Posted: Thu Sep 01, 2016 4:39 pm
by Altare
Do you have multiple instances? You only need to create one aggregate per instance, so if Peer A, B and C are in the default instance, you only need to create the aggregate once.