community string

[vmb01]

In T0 I need to insert a BGP community string into a route coming from a segment connected to T1.

Is it possible to do it ? Wher in the GUI ?

[mauricioamorim · Accepted solution]

Yes, you can do that. With these steps:

1) Create a prefix-list that matches the segment you want;

2) Create a route-map that matches on this prefix-list and sets the community you want;

3) Add this route-map as a route filter in the outbound direction on your T0 BGP neighbor.

This will insert the community in routes sent to the BGP neighbor in the physical network.

Just be careful with route-map and logic so that you don't filter out other routes.

[vmb01]

Thanks

and what can I do clicking on COMMUNITY LISTS ?

[mauricioamorim]

"Community lists are user-defined lists of community attribute values. These lists can be used for matching or manipulating the communities attribute in BGP update messages."

See Create a Community List

You can use them in route maps to match certain communities and then take certain action on the routes that match.