Unable to ping print server through MPLS Cloud

[douglas.mckee]

Good Morning,

We previously had a T1 on our 2911 router connecting directly to our 4451 at a different site. Both sites were using OSPF feeding into the same MPLS cloud. Several months ago we upgraded our speed at both locations to 10MB/20MB respectively. This enabled us to disconnect the direct T1 connection between the 2911 and 4451 routers and connect the 2911 directly to OSPF cloud. Several months later a print server was placed at the 4451 location but personnel connected to the 2911 side cannot ping the print server but other locations connected to the same MPLS cloud can ping this print server. I did a "sh ip route" from the 2911 side and noticed the 10.10.181.0 where the print server resides route is not showing up in the routing table. The local routes on the 2911 are there but a route to the 10.10.181.0 is not there.

Also, when I do a "sh ip route" on the 4451 (Originally directly connected to 2911) the routes from the 2911 do not show up as well. The only main difference I noticed was our Primary 4451 MPLS router that serves all locations does not have a "policy-map MPLS-QoS-Distributed" or "policy-map MPLS-QOS" for the 2911 location. Would this prevent the routes from the 2911 location from being learned via OSPF?

(MAIN MPLS 4451 ROUTER)

policy-map MPLS-QoS-Distributed
 class Location1-Traffic
  shape average 100000000
  service-policy MPLS-QOS
 class Location2-Traffic
  shape average 4000000
  service-policy MPLS-QOS
 class Location3-Traffic

policy-map MPLS-QOS
class Voice
  priority percent 15
 class Video
  bandwidth percent 10
 class Control
  bandwidth percent 5
 class UserTraffic
  bandwidth percent 22
  random-detect dscp-based

Thank you,

Doug

[Richard Burts]

Doug

We do not know enough yet about your environment and your topology to be able to identify the issue. The policy map is providing quality of service processing for delay sensitive traffic. Is there some logic that we do not see that prevents traffic without quality of service (a default action of drop)? If so then not having a policy map for the 2911 might be a problem. My guess is that traffic without quality of service would be sent through with default processing. 

Based on what you have told us this far my guess is that there is not OSPF configuration to carry 2911 traffic and the 4451 through MPLS.

HTH

Rick

[douglas.mckee]

Rick,

There's no logic that would be preventing this traffic from flowing. The 2911 router can ping the 10.10.181.0 (Printer subnet) on the 4451 but cannot ping the printer subnet from the users 3650 switch connected directly to the 2911 router.

[Richard Burts]

Doug

It is interesting that the 2911 can ping the printer subnet but that the switch (and I believe the users connected through that switch) can not ping the printer subnet. To investigate this would you post the output of the following commands on the 2911

show ip route

show ip ospf 

show ip ospf neighbor

HTH

Rick

[douglas.mckee]

Rick,

Attached is the Willaby topology layout. We are currently experiencing connectivity issues to our network devices due to a issue with one of our servers but hopefully will be up soon in order to run the aforementioned commands.

Thank you,

Doug

[Richard Burts]

Doug

Thanks for the diagram. It should be helpful. But it puzzles me. Your original post indicates that subnet 10.10.181 is the printer subnet. But the diagram shows that 10.10.181 is the lan subnet of the 2911 and probably that the printer subnet is 10.10.136.

Part of your symptom is that the router is able to ping the printer subnet but the lan attached devices are not able to ping the printer subnet. A common explanation for this is that when pinging from the router, by default, it will specify the source address of the ping as the address of its outbound interface. So the router ping does not have its source address in the lan subnet. If you do a ping from the router and specify that the source address should be the address of the lan interface then I believe that ping would fail.

When your network stabilizes I look forward to the output that I requested. Perhaps I would like to add to that request that you post the configuration of OSPF on the 2911.

HTH

Rick

[douglas.mckee]

Rick,

Attached is the updated diagram. Was working on a few things and didn't recheck.

Thank you,

Doug

[Richard Burts]

Doug

Thanks for the corrected diagram. Now the diagram does match the verbal description. I look forward to the outputs when they are available.

HTH

Rick