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Usage of Update-Source Loopback X

jskfan
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Last Modified: 2019-08-01
Usage of Update-Source Loopback X

I have seen in BGP configuration where they configure : Neighbor x.x.x.x remote-as x  Update-Source Loopback X
Even if there is only one path to reach the neighbor
for instance in the topology below, let's take R5 with R1 as example:

R5: Neighbor 1.1.1.1 remote-as 1 update source loopback 0

instead of Neighbor 51.0.01 remote-as 1

assuming R5 s1/0= 51.0.0.5/24 and R1 s1/2 =51.0.0.1/24

Thank you

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Sr.Net.Eng
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Top Expert 2011
Commented:
That is fine. It is still best practice, so if you end up adding an additional path in the future to the neighbor the loopback is already in place. It's similar to when you see a port channel with one member interface. It is just a proactive approach in case you add an additional member to the port channel in the future and not have to create it altogether.

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Commented:
Ok.. Thank you Soulja for the info.