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Forum Replies

  1. Thanks Rene - so am I right in thinking there is no implicit deny on a route map used as an export map in this process? Anything not matched on the route-map will just use the default settings configured.

    Normally when applying a route-map to a neighbour in IPv4 (e.g. neighbor X route-map Y) if something isn’t positively matched in the route-map, it will get dropped?

  2. Hi Chris,

    It still has the implicit deny but when you use a route-map as an export-map, it only tells the router which route-targets to add. When you use a route-map with a neighbor for a routing protocol, it works as a filter for routes.

    For example, this is the default route-target on PE1:

    ip vrf CUSTOMER
     rd 1:1
     route-target export 1:1:
    

    And we use this export-map:

    PE1(config)#ip prefix-list CE1_L0 permit 1.1.1.1/32
    PE1(config)#route-map EXPORT_MAP permit 10
    PE1(config-route-map)#match ip address prefix-list CE1_L0
    

    Then we end up with:

    PE1#show ip bgp vpnv
    ... Continue reading in our forum

  3. Hi Rene,

    Thank you for your nice lesson . Need to know more about the “Additive” keyword functionality . Can you please more brief on it?

    BR//ZAMAN

  4. Hello Zaman

    The additive keyword will allow you to add an export map without overwriting the previously configured ones. For example, if you configure the following:

    PE1(config)#route-map EXPORT_MAP permit 10         
    PE1(config-route-map)#set extcommunity rt 1:1 
    

    and then at a later time you configure this:

    PE1(config)#route-map EXPORT_MAP permit 10         
    PE1(config-route-map)#set extcommunity rt 3:3 
    

    The result is that the 1:1 entry will be overwritten by the 3:3 entry. However, if you use the additive keyword like this instead:

    PE1(config)#route-map E
    ... Continue reading in our forum

  5. Hi @lagapides
    So will this additive keyword still cause my routes to stay at the other end PE orwill it be removed from the far end PE node ?

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