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Odd routing issue during MPLS integration

Andrew Cormier
Level 1
Level 1

Hi. We installed an MPLS network this week an while there is connectivity and propagation of routers between all nodes

we have the ISP router (172.18.1.17) plugged into a catalyst 3750X (vlan 102 ip address 172.18.1.18)

Also plugged into the catalyst is another catalyst via trunk. 172.18.1.19

The user vlan that we have published via ospf is 192.168.0.0/24.

If I do a traceroute to a workstation on the first switch it shows mpls router -->second switch --> workstation on the first switch.

If I do a traceroute to a worksation on the second switch it shows mpls router --> second switch --> timeout...

Can someone tell me why:

A) the second last hop is the ip of the switch that ISNT plugged direclty into the MPLS router

B)if A is normal why I cannot reach workstations on the second switch.

Here are the (abbreviated traces) .51 is a WS on the second switch. .18 is a WS on the first switch. Within the vlan there is full connectivity.

Tracing route to 192.168.0.51 over a maximum of 30 hops

  1     2 ms     1 ms     1 ms  172.16.1.1

  2     2 ms     1 ms     1 ms  172.18.1.1

  3     1 ms    <1 ms    <1 ms  172.30.34.1

...

...

...

  7    10 ms    <1 ms    <1 ms  172.30.34.9

  8    10 ms     9 ms     9 ms  172.30.34.10

  9    10 ms    10 ms    44 ms  172.18.1.19

10     *        *     ^C

C:\Users\andrewc>tracert -d 192.168.0.18

Tracing route to 192.168.0.18 over a maximum of 30 hops

  1     3 ms    <1 ms     1 ms  172.16.1.1

  2     1 ms     1 ms     1 ms  172.18.1.1

  3    <1 ms    <1 ms    <1 ms  172.30.34.1

...

...

...

  7    <1 ms    <1 ms    <1 ms  172.30.34.9

  8    10 ms    10 ms    10 ms  172.30.34.10

  9    13 ms     9 ms    10 ms  172.18.1.19

10    12 ms    13 ms    23 ms  192.168.0.18

1 Reply 1

blau grana
Level 7
Level 7

Hello Andrew,

Do you have correctly configured default-gateway/routing on second switch [depends on if it is L2/L3 switch]?

Can you post configuration of both switches?

Best Regards

Please rate all helpful posts and close solved questions

Best Regards Please rate all helpful posts and close solved questions