Tag-switching IP Issues

Unanswered Question
Jun 11th, 2008
User Badges:

Hi

I have 2 routers with a FE link,

7206 ---Trunk---> switch 3560-48 ---> link WAN with FE to ---> 3640 --trunk->sw3560-48-->customers,

my Internet access is via the 7206 router.


I need to stablish a ibgp session to configure VPN-MPLS for some services, i set the mpls parameters and is posible to stablish the session,

ip cef is on, and i can see the TDP Neighbor UP between 7206 and 3640.


I have a switch 3560-48 connected to the router 3640, the link its a trunk, so i can use these ports for

internet customer access.


well, when I apply the tag-switching ip or mpls ip ont the interfaces between 7206 and 3640 link,

the customers that have only internet access via the 3640 router have problems to browse, www.yahoo.com and some other pages.


When I remove the tag-switching ip or mpls ip


the service normalizes.


could somebody help me with this issue


Thank you

Rolando


  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
Jon Marshall Wed, 06/11/2008 - 13:57
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

Rolando


This sounds like it could be an MTU issue. Could you try changing the MTU to 1520 on all MPLS enabled interfaces and retest.


You may also need to increase the MTU on your 3560 switches.


Jon

rpazosvargas Thu, 06/12/2008 - 08:03
User Badges:

Jon

Thank you for the information,

just to be shure,


I can use this command to modify the MTU on my switches?

sw(config)#system mtu 1520


so could you help me to define where i must to change the mtu because i am using trunks,

and which MTU must modify,

the mtu only or mpls mtu or both


i attach a diagram with the topology


Thank you for your help


Rolando







Actions

This Discussion