Xconnect over RSVP-TE

[paolo_carbone]

I have a requirement to pass a Xconnect over an RSVP-TE signalled tunnel, but I do not have the option to add a preferred-route so the Xconnect always passes over LDP signalled LSPs.

All examples I have seen suggest to use preferred-route under xconnect configuration but this is not available on either a 7200 router or ME3600.

Could anyone advise on how I get the xconnect to pass over the RSVP-TE tunnel?

Thanks

Paolo

[Akash Agrawal]

Hi,

If preferred path option is not there then probably you need to do routing to prefer TE tunnel for xconnect destination. It can be done via static route or auto-route announce. If this causes all traffic between two PE taking one TE tunnel, you can have different loopback for the xconnect so that only traffic for that L2vpn can be routed via that tunnel.

--Pls dont forget to rate helpful posts--

Regards,

Akash

[paolo_carbone]

Thanks for this.

I have tried setting up another tunnel interface between different loopbacks which comes up fine, however when I try to xconnect between the new loopbacks i get an MPLS Config error saying the loopback address is not a valid LDP id, use the original loopback instead.

Any thoughts?

Paolo

[Akash Agrawal]

Hi Paolo,

For TE to come up , TE destination should be TE router-id on tail-end but for xconnect there is no such requirement. Please share the error message and check if LSP to new loopback is through or not. you can use command "ping mpls ipv4 <destination loopback> <source loopback>"

-Akash 

[paolo_carbone]

Hi Akash,

Thanks for your help.

The RSVP-TE tunnel is up ok and I have a route for the second loopback through the tunnel using a static route. But when I configure the Xconnect to use the second loopback I get the following error:

MPLS config error: 10.191.254.4 is not a valid LDP id, use 10.191.255.4 instead.

I am using 7200 routers on GNS3 but plan to implement this on ME3600 in our live network.

I do not have the ping mpls command available.

Thanks

Paolo

Relevant config below:

Side 1:

interface Loopback0
 ip address 10.191.255.3 255.255.255.255
!
interface Loopback1
 ip address 10.191.254.3 255.255.255.255
!
interface Tunnel69
 ip unnumbered Loopback0
 tunnel destination 10.191.255.4
 tunnel mode mpls traffic-eng
 tunnel bandwidth transmit 10000
 tunnel bandwidth receive 10000
 tunnel mpls traffic-eng path-option 1 dynamic
 no routing dynamic
!
interface FastEthernet0/0
 ip address 10.191.0.2 255.255.255.254
 ip ospf cost 200
 duplex auto
 speed auto
 mpls ip
 mpls traffic-eng tunnels
 ip rsvp bandwidth 50000 50000
!

interface FastEthernet1/0.11
 encapsulation dot1Q 11
 no cdp enable
 xconnect 10.191.254.4 70 encapsulation mpls
!

Side 2:

interface Loopback0
 ip address 10.191.255.4 255.255.255.255
!
interface Loopback1
 ip address 10.191.254.4 255.255.255.255
!
interface Tunnel69
 ip unnumbered Loopback0
 tunnel destination 10.191.255.3
 tunnel mode mpls traffic-eng
 tunnel bandwidth transmit 10000
 tunnel bandwidth receive 10000
 tunnel mpls traffic-eng path-option 1 dynamic
 no routing dynamic
!
interface FastEthernet0/0
 ip address 10.191.0.3 255.255.255.254
 ip ospf cost 200
 duplex auto
 speed auto
 mpls ip
 mpls traffic-eng tunnels
 ip rsvp bandwidth 50000 50000
!

interface FastEthernet1/0.11
 encapsulation dot1Q 11
 no cdp enable
 xconnect 10.191.254.3 70 encapsulation mpls

[medhat elsaeed]

Hello Paolo,

Use the ATOM Tunnel selection feature

http://www.cisco.com/c/en/us/td/docs/ios/12_2sr/12_2sra/feature/guide/srtunsel.html#wp1055371

at both sides configure the following PW

pseudowire-class paolo
 encapsulation mpls
 preferred-path interface Tunnel69

Then on Side 1:

interface FastEthernet1/0.11
 encapsulation dot1Q 11
 no cdp enable
 xconnect 10.191.254.4 70 pw-class paolo

Side 2 :

interface FastEthernet1/0.11
 encapsulation dot1Q 11
 no cdp enable
 xconnect 10.191.254.3 70 pw-class paolo

Thanks

[paolo_carbone]

Hi,

Thanks for your answer, but unfortunately I do not have the preferred-path option available - this is the problem.

Thanks

Paolo