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Webcast-Catalyst9k
New Member

MPLS conflicts with OSPF

I'm trying to turn on MPLS in my network. This network includes some number of Cisco 720x and 750x routers, connected with OSPF protocol.

I turn on the MPLS on all of them, but they don't see each other

(the command 'sh mpls ldp neighbor' don't show any neighbors, but 'sh mpls ldp discovery' shows them all).

After adding one new Cisco 7500 (without OSPF) it see one of

'old' routers as its neighbor, and vice versa. After I configure OSPF

on this new router, it losts its neighbor.

1 ACCEPTED SOLUTION

Accepted Solutions
Silver

Re: MPLS conflicts with OSPF

Are you using loopbacks for your Router ID, if so are you using a /32 mask (or the " ip ospf network point-to-point" command if not a /32 mask). If not MPLS will advertise the RID with the configured mask but OSPF will advertise it as a /32, this will cause a mismatch between MPLS and OSPF and cause label binding to fail.

Try the following URL's for hints on troubleshooting MPLS:

http://www.cisco.com/warp/customer/105/mpls_tsh.html

http://www.cisco.com/warp/customer/105/troubleshoot_mpls_vpn.html

2 REPLIES
Silver

Re: MPLS conflicts with OSPF

Are you using loopbacks for your Router ID, if so are you using a /32 mask (or the " ip ospf network point-to-point" command if not a /32 mask). If not MPLS will advertise the RID with the configured mask but OSPF will advertise it as a /32, this will cause a mismatch between MPLS and OSPF and cause label binding to fail.

Try the following URL's for hints on troubleshooting MPLS:

http://www.cisco.com/warp/customer/105/mpls_tsh.html

http://www.cisco.com/warp/customer/105/troubleshoot_mpls_vpn.html

New Member

Re: MPLS conflicts with OSPF

After I'd change mask to /32 all works as expecting ! Thank you !

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