From: ahmed mahmoud (ahmadforever@gmail.com)
Date: Sun Jul 27 2008 - 08:15:32 ART
Good day Everyone.
I faced a problem while solving one of the CCIE senarios, Where I had an
Inter-AS case using the MP-EBGP neighborship between the ASBRs , while the
connection between the ASBRs was PPPOE... the problem is the following.
The accepting side of the PPPOE connection (The virtual template ) is
perfect as the BGP updates are coming with the labels and the labels are
injected into the LFIB as below
======================================================================
Rack1R6#sh ip b v a 10.1.7.0
BGP routing table entry for 1000:1:10.1.7.0/24, version 23
Paths: (1 available, best #1, no table)
Advertised to non peer-group peers:
24.1.3.3
200
24.1.56.5 from 24.1.56.5 (24.1.5.5)
Origin incomplete, localpref 100, valid, external, best
Extended Community: RT:200:2 OSPF DOMAIN ID:0x0005:0x000000010200 OSPF
RT:0.0.0.0:2:0 OSPF ROUTER ID:10.1.47.4:512,
mpls labels in/out *27/30*
Rack1R6#sh mpls forwarding-table
*27 30* 1000:1:10.1.7.0/24 \
=====================================================================================
while on the dialing side of the PPPOE (Dialer Interface) the BGP updates
are coming with the labels but the LFIB is not populated and the
forwarding fails as below
========================================================================
Rack1R5#sh ip b v a 10.1.8.0
BGP routing table entry for 1000:1:10.1.8.0/24, version 33
Paths: (1 available, best #1, no table)
Flag: 0x820
Advertised to update-groups:
2
100
24.1.56.6 from 24.1.56.6 (24.1.6.6)
Origin incomplete, localpref 100, valid, external, best
Extended Community: RT:100:1 OSPF DOMAIN ID:0x0005:0x000000010200
OSPF RT:0.0.0.0:2:0 OSPF ROUTER ID:10.1.28.2:512,
mpls labels in/out *34/25*
Rack1R5#sh mpls for
Rack1R5#sh mpls forwarding-table
Local Outgoing Prefix Bytes tag Outgoing Next Hop
tag tag or VC or Tunnel Id switched interface
16 Pop tag 24.1.4.4/32 0 Fa0/0 24.1.45.4
17 20 24.1.1.1/32 0 Fa0/0 24.1.45.4
18 18 24.1.9.9/32 0 Fa0/0 24.1.45.4
19 Pop tag 24.1.14.0/29 0 Fa0/0 24.1.45.4
20 17 24.1.19.0/24 0 Fa0/0 24.1.45.4
21 Untagged 24.1.56.6/32 0 Vi1 point2point
29 23 1000:1:192.10.1.0/24 \
0 Fa0/0 24.1.45.4
30 16 1000:1:10.1.7.0/24 \
18526 Fa0/0 24.1.45.4
31 21 1000:1:10.1.47.0/24 \
0 Fa0/0 24.1.45.4
32 22 1000:1:51.51.51.51/32 \
0 Fa0/0 24.1.45.4
33 20 1000:1:10.1.18.0/24 \
0 Fa0/0 24.1.45.4
Rack1R5#
====================================================================
Please advise !!!
Thanks
Ahmed Sayed
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