Hi all,
I'm having problem with Task 5.6. Basically, the problem involves with this
topo section:
[R6-----------AS200-----------R9]
vrf VPNA vrf VPNA
| |
[R2---------AS65123-----------R1]
This is CSC scenario, AS200 is the Carrier AS, AS65123 is the Customer AS.
OSPF is running inside AS65123. MP-iBGP is configured between R6-R9. LDP is
enabled inside AS 65123 on the link R1-R2 and between R2-R6 & R1-R9.
Configurarion:
R6:
interface Serial4/0.602 point-to-point
bandwidth 2000
ip vrf forwarding VPNA
ip address 123.2.6.6 255.255.255.0
mpls ldp discovery transport-address interface
mpls label protocol ldp
mpls ip
frame-relay interface-dlci 602
!
router ospf 300 vrf VPNA
redistribute bgp 200 subnets
network 123.2.6.6 0.0.0.0 area 0!
!
router bgp 200
neighbor 200.200.200.9 remote-as 200
neighbor 200.200.200.9 update-source Loopback0
!
address-family vpnv4
neighbor 200.200.200.9 activate
neighbor 200.200.200.9 send-community both
exit-address-family
!
address-family ipv4 vrf VPNA
redistribute ospf 300 vrf VPNA
+++++++++++++++++++++++++++++++++++++++++++
R9:
interface Serial4/2
ip vrf forwarding VPNA
ip address 123.1.9.9 255.255.255.0
encapsulation ppp
mpls ldp discovery transport-address interface
mpls label protocol ldp
mpls ip
!
router ospf 300 vrf VPNA
log-adjacency-changes
redistribute bgp 200 subnets
network 123.1.9.9 0.0.0.0 area 0
!
router bgp 200
!
address-family vpnv4
neighbor as200 activate
neighbor as200 route-reflector-client
neighbor as200 send-community both
neighbor 200.200.200.6 peer-group as200
exit-address-family
!
address-family ipv4 vrf VPNA
redistribute ospf 300 vrf VPNA
no auto-summary
no synchronization
+++++++++++++++++++++++++++++++++++++++++++
R2:
interface Serial4/0.206 point-to-point
bandwidth 2000
ip address 123.2.6.2 255.255.255.0
mpls ldp discovery transport-address interface
mpls label protocol ldp
mpls ip
frame-relay interface-dlci 206
+++++++++++++++++++++++++++++++++++++++++++
R1:
interface Serial4/3
ip address 123.1.9.1 255.255.255.0
encapsulation ppp
mpls ldp discovery transport-address interface
mpls label protocol ldp
mpls ip
My configuration works well except I cannot ping the direct link between R2
& R6 after enabling LDP. Somehow looping happens here.
Traceroute from R2 show loop happens even R2 ping its direct link
R2#trace 123.2.6.6
Type escape sequence to abort.
Tracing the route to 123.2.6.6
1 123.2.6.6 [MPLS: Label 24 Exp 0] 36 msec 260 msec 136 msec
2 123.2.6.2 156 msec 88 msec 140 msec
3 123.2.6.6 [MPLS: Label 24 Exp 0] 72 msec 80 msec 56 msec
4 123.2.6.2 244 msec 116 msec 240 msec
5 123.2.6.6 [MPLS: Label 24 Exp 0] 308 msec 88 msec 252 msec
6 123.2.6.2 188 msec 208 msec 188 msec
7 123.2.6.6 [MPLS: Label 24 Exp 0] 360 msec 228 msec
+++++++++++++++++++++++++++++++++++++++++++++++++++
R2#sho ip route connect
21.0.0.0/24 is subnetted, 1 subnets
C 21.1.2.0 is directly connected, ATM3/0.221
123.0.0.0/8 is variably subnetted, 9 subnets, 2 masks
C 123.1.2.0/24 is directly connected, FastEthernet0/0
C 123.123.123.2/32 is directly connected, Loopback0
C 123.2.6.0/24 is directly connected, Serial4/0.206
+++++++++++++++++++++++++++++++++++++++++++++++++++
R2#sho mpls for 123.2.6.0
Local Outgoing Prefix Bytes Label Outgoing Next Hop
Label Label or VC or Tunnel Id Switched interface
None 24 123.2.6.0/24 0 Se4/0.206 point2point
+++++++++++++++++++++++++++++++++++++++++++++++++++
R6#sho mpls for | i 123.2.6.0
24 Pop Label 123.2.6.0/24[V] 5791594 Se4/0.602 point2point
So somehow R2 takes the label assigned by R6 for its direct link and cause
the loop.
Does anyone has the same problem?
Thanks.
Rin
