Hi All,

How does "set excummunity soo X:Y" works?

Does "set excommunity soo x:y" means that first check if matched route is not already know with that community, if it is reject it, if its not add the excummounity to it?

or to make a long story short: how exactly IOS treats a route with SOO?



  • As far as I know, that command will append the "SOO" community string to the MP-BGP route that learned from its CE via ebgp. As such the remote PE will examine the route and stop advertise the route to the CE that belongs to the same vrf.

    This prevents CE from using the PE as primary next-hop (because ebgp AD is lower than all other igp) to reach the CE's network.
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