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MPLS TE: Explicit PE to PE tunnels not working

souagarw
Cisco Employee
Cisco Employee

I'm working on scenario mentioned in file attached:

R3 and R4 are PE routers, C1 and C2 are CE routers, rest are P-routers. OSPF is running in the core IGP. RSVP and MPLS tunnels are configured on all intermdiate interfaces.

150.1.3.3/32 and 150.1.4.4/32 are loopbacks of R3 and R4 and BGP peering is between loopbacks.

Problem is when I'm configuring explicit path (R3-R1-R2-R5-R4) in tunnel at R3, traffic is not passing between C1 and C2 thought tunnels are up. I noticed that MPLS forwarding table in R3 is showing Untagged in outgoing label for 150.1.4.4 prefix.

Similar setup is working fine if i configure dynamic tunnels (dynamic path is R3-R1-R2-R4) and I see Pop tag is showing as outgoing label for 150.1.4.4 prefix.

Attached file has tunnel and explicit path config, output of sh mpls forwarding and sh mpls traffic-eng tunnels.

Thanks

Sourabh

6 Replies 6

souagarw
Cisco Employee
Cisco Employee

File attached.

Harold Ritter
Cisco Employee
Cisco Employee

Sourabh,

Could you please attach a "show ip cef vrf " from R3 for one of the VRF prefixes.

Regards

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

R3(config-if)#do sh ip cef vrf VPN 10.1.8.8 255.255.255.255

10.1.8.8/32, version 10, epoch 0

0 packets, 0 bytes

tag information set

local tag: VPN-route-head

fast tag rewrite with

Recursive rewrite via 150.1.4.4/32, tags imposed {23}

via 150.1.4.4, 0 dependencies, recursive

next hop 150.1.4.4, Tunnel0 via 150.1.4.4/32

valid adjacency

tag rewrite with

Recursive rewrite via 150.1.4.4/32, tags imposed {23}

R3(config-if)#

I see only MPLS TE tag imposed and not MPLS VPN label.

Regards

Sourabh

Sourabh,

Could you please post the configuration for both PEs (R3 and R4).

Regards

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Harold,

I have now created MPLS TE dynamic tunnels on both PEs and attached herewith are the configs and sh outputs.

Thanks

Sourabh

On R3, this is what you have-

router bgp 1

no bgp default ipv4-unicast

bgp log-neighbor-changes

neighbor 10.1.37.3 remote-as 2

....

....

address-family ipv4 vrf VPN

neighbor 10.1.37.7 remote-as 2

neighbor 10.1.37.7 activate

.....

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