topic BGP priority for same AS in Data Center (SLX)

BGP priority for same AS

samim — Fri, 15 Jan 2021 22:47:30 GMT

Hello All

I have following situation on my EDGE Router (SLX-9640) with BGP. I have many of Transit connections and AS’s on the same Router, and between them 2x of them are from same Vendor (AS) with two different speed (10G) and (100G).

The question is as follow: How can I configure my BGP only for this Vendor (AS) with 2X connections in the way, that 80% of Traffic on it will use 100G link, and only rest of it will use 10G link. But in same time where other BGP AS connections from other Vendors will be not affected of this change.

Thanks!

King Regards;

Re: BGP priority for same AS

joergkost — Fri, 15 Jan 2021 23:04:50 GMT

How complicated is your configuration in general?

When talking about outgoing traffic,

you may want to look at the BGP weight attribute here. This is only significant for the local router box. Also you can check if your neighbor AS is signaling MEDs, then you could compare these.

https://www.noction.com/blog/bgp-med-attribute

If you have a more complicated setups, you could decrease the local-pref value on the 10G link.

For incoming traffic, you could signal MED but also use prepending on the 10G session.