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Cisco Employee

MPLS TE: Explicit PE to PE tunnels not working

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
Cisco Employee

Re: MPLS TE: Explicit PE to PE tunnels not working

File attached.

Cisco Employee

Re: MPLS TE: Explicit PE to PE tunnels not working

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
Cisco Employee

Re: MPLS TE: Explicit PE to PE tunnels not working

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

Cisco Employee

Re: MPLS TE: Explicit PE to PE tunnels not working

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
Cisco Employee

Re: MPLS TE: Explicit PE to PE tunnels not working

Harold,

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

Thanks

Sourabh

Community Member

Re: MPLS TE: Explicit PE to PE tunnels not working

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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