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Balance traffic based on link bandwidth between two or more eBGP session established with the same carrier

iento
Level 1
Level 1

BGPHello everyone 

 

I would like to understand how to load balance traffic between two or more eBGP session established with the same carrier on different links. 

Links for sessions have different bandwidth, so I would balance traffic in order to avoid link congestion on link with lower bandwidth.

 

For example I have 2 links, one of 70 Gb and another of 30 Gb. On each link is configured a P2P with the carrier and established an eBGP session. 

Using the "multipath" option under BGP configuration I obtained a traffic ratio of 1:2 on each link. Instead, I would like to obtain a ratio of 3:10 on link with 30Gb of bandwidth and a ratio of 7:10 on link with 70Gb of bandwidth.

 

Can someone help me? I'm using asr9k router 

 

1 Reply 1

Alex Pfeil
Level 7
Level 7

Please check out this blog.

 

https://ccieblog.co.uk/bgp/bgp-unequal-load-cost-sharing

 

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