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Influencing outbound iBGP route

from88
Level 4
Level 4

Hello,

 

Is it possible to influence outbound iBGP route ? AFAIK as-path doesn't work. MED too ?

4 Replies 4

ADP_89
Level 1
Level 1

Hello,

 

You should consider using Local Preference for that. Not sure what your use case is but you might set a higher LP on the inbound route-policy attached to the neighbor.

 

HTH,

ADP

Thanks,

 

The main problem that the inbound router is not 'manageable' (it's AWS)

Could i use LP on the outbound policy ?

Sure thing, you can set the LP on the outbound policy as well. But if for some instance the inbound router resets it via a policy the changes will be useless.

 

ADP

You can use local preference BGP community tags to achieve load balancing and route preference for incoming traffic to your network. For each prefix that you advertise over a BGP session, you can apply a community tag to indicate the priority of the associated path for returning traffic. Local preference BGP community tags are supported for private virtual interfaces.

The following local preference BGP community tags are supported:

  • 7224:7100—Low preference

  • 7224:7200—Medium preference

  • 7224:7300—High preference

https://docs.aws.amazon.com/directconnect/latest/UserGuide/routing-and-bgp.html