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MPLS In Cisco Routers

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Last Modified: 2020-05-21
Which routing protocol is best for MPLS?
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David Johnson, CDSimple Geek from the '70s
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Distinguished Expert 2019

Commented:
it doesn't use ip routing protocols
Cisco uses their Cisco Tag Distribution Protocol (TDP) as the label distribution protocol. (they have to have their own name for everything) https://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/4649-mpls-faq-4649.html#anc2 
GiboSystems Engineer

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Commented:
are you sure? I’ve seen forums on MPLS supporting RIP OSPF BGP EIGRP
David Johnson, CDSimple Geek from the '70s
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Distinguished Expert 2019

Commented:
Those are not specific to MPLS  Basically you configure it as one big network that is in geographically different places. MPLS fits between layer 2 and layer 3
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Distinguished Expert 2018

Commented:
Generally, most of time routing for MLSP transport is combination of link state routing protocol (IS-IS or OSPF) + BGP (that is case with most ISPs). Link state protocols are providing possibility of traffic engineering and BGP is providing route advertising to Label edge routers.

TDP is just Cisco pre standard implementation of LDP (Cisco was actually started it first), but newer Cisco devices do not support TDP, only LDP is supported.
GiboSystems Engineer

Author

Commented:
Is RIP version 2 good or recommended for MPLS?

Please advise, thanks!
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Distinguished Expert 2018

Commented:
Generally RIP (any version) has slow convergence time (in Cisco's case can be adjusted, but some vendors can't tune timers for RIP) and RIP has no information regarding best path (regarding throughput) it is just counting how many routers will be passing along the path. So generally any other protocol would be better than RIP.

If you are asking for running RIP between PE and CE. You can go that way, but IS-IS, OSPF or BGP should be preferred.
Benjamin Van DitmarsSr Network Engineer
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Commented:
We normaly use IS-IS for inner mpls route redistribution. so all P and PE routers will do mpls with IS-IS. ospf is also a good setup. the PE routers will do bgp in vrf's for the routing.

are you trying this in a lab. or setting up youre private mpls. because the basic is not that hard.
the seccond part will be shaping dscp to exp to have the correct priority on the packets that are send label.
if you dont do this. weird problems will happed between the PE's
GiboSystems Engineer

Author

Commented:
Trying RIP v2 in production
Benjamin Van DitmarsSr Network Engineer
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Commented:
what youre using rip for the P to PE communications ?
i hope not because it's called RIP for a reason, its old and slow in coverage.

cisco advices ospf in small setup's and IS-IS in the bigger networks.

why are you trying it do to with RIP ?

some oneNetwork Architect
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Top Expert 2014

Commented:
Don't use RIP or v2. I'd use OSPF as your internal routing protocol. Use BGP for any external routing.
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