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question about lable switch protocol??

Whether does the whole network require the same lable switch protocl,just like tdp or ldp? Whether can I adopt the mixed way of both ldp and tdp to the whole MPlS VPN environment?

Sincerely

9 REPLIES
Cisco Employee

Re: question about lable switch protocol??

You can use both LDP and TDP in your network to deploy MPLS VPN solutions as long as you make sure to use the same protocol at both ends of any given link.

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

Re: question about lable switch protocol??

according to what you said, Could I deploy the PE and P as the following way:

PE tdp<--->tdp P tdp<-->tdp P ldp<--->ldp PE

Thanks

Cisco Employee

Re: question about lable switch protocol??

This will work just fine.

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

Re: question about lable switch protocol??

Thanks for your answer. My issue is this architecture:

PEa ldp<--->ldp P tdp<-->tdp P ldp<--->ldp PEb

PEa can not communicate with PEb. PEa can just communicate with other PEs which are all connected to same P router,but can not communicate with other PEs belong to connected to other p.

New Member

Re: question about lable switch protocol??

Can you elaborate what do you mean by "not communicate" ?

Have you checked your MP-IBGP is working fine ?

Is your configuration correct ?

Run MPLS troubleshooting command.

-Waris

New Member

Re: question about lable switch protocol??

pe is the other manufacture, not cisco.

Cisco Employee

Re: question about lable switch protocol??

This is not an issue as long as you make sure you configure LDP on the links to that other vendor.

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
Cisco Employee

Re: question about lable switch protocol??

Make sure the TDP neighbor relationship between the P routers is up. Do a "sh mpls ldp nei" on the P routers

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

Re: question about lable switch protocol??

hi ;

please remmber that when you trouble shoot in MPLS

you are looking for two layers

A) LAyer 2.5 which where the labels are imposed

and to make sure that labels are imposed correctly

you need to do two things :

1) make sure that they are propagated correctly

so if it is MPLS-VPN check the Mp-BGP session to carry the VPN label

2) normal MPLS so check the LDP or TDP

make sure that you are not summarizing in the middle

becuase this can be a killer in MPLS-VPN envirments

do to the PHP issue

make sure that there is no switches in the middle that does not support Jumbo frames

this is If you are sending very Fat Packets and you are putting two labels in the frame !!!

====================================================

then with all the show commands If every thing is going fine then

B) go for the IGP and BGP trouble shooting

to make sure that the prefixs are being send and receviced properly

becuae in some enviroment we do concentrat more on the MPLS part but forget about the IGP and BGP part

make sure that redistrubution is done correctly and that when you trace-route from IOS that support MPLS

you can see Two labels , top label only swapping till you can reach the other side

hope that helps

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