You are absolutely right. If you want to exchange labels for BGP prefixes, you should specify on both ends a neighbor .... send-label. Then it all depends on which IOS you are doing this.
12.xS will automatically add the 'mpls bgp forwarding' to an interface, this is not something you have to do yourself. On that same S release, you will see these labels in the 'show mpls forwarding-table' output. On 12.3/4(T) the mpls bgp forwarding command doesn't even exist and is also not configured under the interface. The labels are also NOT shown in the 'show mpls forwarding-table' but you have to verify under 'show ip bgp labels' and to check if they are really propagated to the LFIB check with 'show ip cef x.x.x.x', there you'll see a label is added to the packet or not. Note that this is absolutely different from 'mpls ip' which enables LDP/TDP for exchanging labels for IGP prefixes. The method you are configuring now is labels exchanging through BGP for BGP prefixes. -- Regards, Rick Mur CCIE2 #21946 (R&S / Service Provider) Sr. Support Engineer – IPexpert, Inc. URL: http://www.IPexpert.com 2009/11/25 César Martínez Segura <[email protected]> > Hi guys, > > If I'm not wrong, it's possible to send labels between two routers without > configuring 'mpls ip' in the interfaces that connect each other. For that, > it is only necessary to configure under the 'address-family ipv4' 'nei @ > send-label'. Doing just only that, is MPLS enabled or I have to configure as > well, under the interfaces, 'mpls bgp forwarding'? How could I check it is > working? > > Thanks, > Cesar. > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > >
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