Giuseppe Larosa Tue, 02/03/2009 - 10:04

Hello Wang,

I think the question is this:

the extended community list look for a RT that contains only 1:5

actually the routes have an RT made of two RTs

1:1 1:5

or 1:2 1:5

so this is to be taken in account

Hope to help


Giuseppe Larosa Tue, 02/03/2009 - 11:41

Hello Wang,

have you tried to reset the BGP sessions on R1 and R2 to PE nodes R3 and R4.

I've reviewed the command reference and probably the behaviour of standard extended community-list is the one you expect:

there is an implicit deny any at the end

and you can only specify one RT value for line.


instead an expanded extended community list access-list like

ip extcommunity-list ?

<1-99> Extended Community list number (standard)

<100-500> Extended Community list number (expanded)

expanded Add an expanded community-list entry

standard Add a standard community-list entry

a line like the following can be an exact match in your case

RT-RM-SXR000-G1-E-1(config)#ip extcommunity-list 101 deny RT:1:1 RT:1:5 ?


Hope to help


nyl20081224 Wed, 02/04/2009 - 00:56

hello ,i checked config today ,but question awlays has,i thank may not question of rt.



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