Alexander, This behavior is normally seen when ipv4 + label is not configured on the iBGP peer(s). Can you confirm whether send-label is configured for the iBGP peer and do a "show bgp ipv4 unicast neighbor x.x.x.x" for the iBGP peer to confirm that ipv4 + label is both advertised and received.
Regards, -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Alexandre Snarskii Sent: Saturday, June 09, 2007 11:07 AM To: Cisco-NSP Mailing List Subject: [c-nsp] ldp: label not assigned for eBGP-learned route.. Hi! While testing interAS mpls connectivity, I found interesting feature: router does not assign local label to route, learned via eBGP, even in case when got it with label... A bit more detailed description: I'm getting route with label, BGP routing table entry for AA.AAA.AA.5/32, version 5022 BB.BBB.B.49 from BB.BBB.B.49 (BB.BBB.B.6) Origin IGP, metric 0, localpref 100, valid, external, best Community: no-export mpls labels in/out nolabel/101824 and it's installed into mpls forwarding table with outgoing label: Router>show mpls forwarding-table AA.AAA.AA.5 Local Outgoing Prefix Bytes Label Outgoing Next Hop Label Label or VC or Tunnel Id Switched interface None 101824 AA.AAA.AA.5/32 0 Vl99 BB.BBB.B.49 But, as you can see, Local Label is not assigned to this route, so, even if that route redistributed with iBGP over my backbone, label for this route is not assigned at the edge, so, all other routers will not be able to establish LSP to remote side... Well, one workaround to this is to redistribute this route to ospf (this route get label assigned right after enabling bgp->ospf redistribution), but that workaround is potentially dangerous[1]. Are there any way to force local label assignment to eBGP-learned route without redistribution ? PS: IOS version is 12.2(33)SRA3, if it matters. [1]: Some years ago I saw a network meltdown caused by 'no redistribute bgp NNNN route-map BLAH', which removed not 'redistribute' command, but just 'route-map', thus allowing full-view leak into ospf.. With modern IOS behaviour (disable dCEF when there are not enough memory) such leaks are even more dangerous... _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
