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781
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Need help with MPLS TE Tunnel

Working on the following topology.

zeeshanbasit25789_0-1751536148148.png

MPLS TE Tunnel on PE1 is successfuly configured.

zeeshanbasit25789_1-1751536198443.png

zeeshanbasit25789_2-1751536224280.png

but I cannot reach CustomerB from PE1. The control plane information seems to be ok but I am not sure if the data plane is broken.  Any help is appreciated.

zeeshanbasit25789_3-1751536305751.png

zeeshanbasit25789_0-1751536460418.png

 

 

 

1 Accepted Solution

Accepted Solutions

Hi @zeeshanbasit25789 ,

I see what the issue is. You are advertising 155.1.19.0/25 from CustomerB, which is more specific than the directly connected route used on PE2 (155.1.19.0/24).

Please remove this advertisement on CustomerB and the issue should be solved.

Regards,
Harold Ritter, CCIE #4168 (EI, SP)

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25 Replies 25

Harold Ritter
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Hi @zeeshanbasit25789 ,

Connectivity looks good indeed from PE1 towards CustomerB. Can you check the connectivity from PE2 to CustomerA.

Regards,
Harold Ritter, CCIE #4168 (EI, SP)

no reachability from PE2 to CustomerA either

Hi @zeeshanbasit25789 ,

I should have been more specific. Can you provide the "show ip cef vrf" output from PE2 for the prefix for CustomerA?

Regards,
Harold Ritter, CCIE #4168 (EI, SP)

Hi @Harold Ritter ,

Here is the output, I also noticed that it says drop traffic in the mpls forwarding table on PE2 towards CustomerB loopback.

zeeshanbasit25789_0-1751568352990.png

 

Hi @zeeshanbasit25789 ,

Could you please provide the configuration for PE1 and PE2?

Regards,
Harold Ritter, CCIE #4168 (EI, SP)

Hi @Harold Ritter 

Attached files are the config for both routers.

Hi @zeeshanbasit25789 ,

It looks like there are stale entries in the LFIB. Do the following to reset the LFIB on PE2:

wr mem

config t

no router bgp 65000

end

config mem

This will restart the BGP process and should get rid of the stale entries.

Please provide a "show mpls for" from PE2 after performing the above procedure.

Regards,
Harold Ritter, CCIE #4168 (EI, SP)

Hi @Harold Ritter ,

The output after restarting BGP as you suggested.

zeeshanbasit25789_0-1751574263925.png

 

debug mpls traffic-eng path <<- share output of this debug 

MHM

I turned on the debug and tried to ping but no output gets generated.

zeeshanbasit25789_2-1751566806226.png

 

debug mpls traffic-eng path 1 

Run this please done use 0 

MHM

Still the same, no output from the debug. I also noticed that there are no labels assigned to 150.1.9.9 that is the customerB loopback and on PE2 it says drop the traffic for 150.1.9.9

zeeshanbasit25789_0-1751567680972.png

But there is a label assigned to CustomerA on PE1

zeeshanbasit25789_1-1751567723021.png

 

LO you use as ip unnumbered is advertise via underlying ospf ? 

I check your config and yes it adverise via underlying' you need to exclude this Ip from underlying and you must see IP as attached to tunnel

MHM

MHM

@MHM Cisco World ,

In that case I have to change my BGP configuration as well because iBGP and VPNv4 are through the loopback addresses. I will change it and try.