EoMPLS Problem

[qmesbah]

Would like to seek your help to resolve one EoMPLS problem.

My EoMPLS topology is-

CE1[3640]---(FE)---PE1[7206VXR,NPE300]---(FE)---P1[3640]---(E1)---P2[7206VXR,NPE-G1]---PE2[7206VXR,NPE-G1]---(FE)---CE2[3640]

I had configure Ethernet over MPLS on subinterface between PE1 & PE2. P1 and P2 connected via E1 (Encap PPP). On LDP path, MTU is 1530. MPLS L2 VC is up, I can ping CE - CE upto ping size 1480 byte, but not able to transfer any file. In FTP session between CE-CE, can receive only file size upto 1024 byte. I had also try MTU 1560 on the LSP, but result is same.

If I use FastEthernet between P1 and P2, everything works fine with MTU 1530.

How to resolve the issue of the above topology?

Rgds.

Mesbah

[mohammedmahmoud]

Hi Mesbah,

Sorry for the late reply, i was very busy the last couple of days, i'll do test your configuration in my lab as soon as possible and feed you back.

BR,

Mohammed Mahmoud.

[mohammedmahmoud]

Hi Mesbah,

Sorry for the late reply, i just had very urgent things to take care of, please do accept my apologies. The configuration you've posted is very straight forward and seems to have no problem, can you please describe the specific symptoms and the configuration done on the switches.

BR,

Mohammed Mahmoud.

[qmesbah]

Hi Mahmoud,

On switch we had configure Vlan same as PE router, port connected to PE configured as Trunk and port connected to PC configured as access for that Vlan.

Problem is, when we try to transfer file between both end PC, can transfer file smoothly from one side only, from other side transfer speed is very slow and ftp connection drop after transfer of 1024 byte.

There is no ACL and Rate-limit on the LSP.

[mohammedmahmoud]

Hi Mesbah,

I've labed your exact setup and it worked perfectly (the only difference is that i've used ATM interfaces rather than the serial interfaces, but its not a big deal), can you elaborate on the systems part.

[Sorry for the late replies i am currently in the middle of an important project, which is keeping me extremely busy]

BR,

Mohammed Mahmoud.

[qmesbah]

Dear Mahmoud,

Thanks a lot for your effort and time.

BR,

Mesbah

[a.alekseev]

hi

in any case you have a problem with MTU.

You break MTU1500 along the path.

Try to determine what is the maximum ip packet size with df-bit set you can transfer along the path.

your 7206VXR,NPE300 and 3640 are very old.

They cannot preserve MTU on the path. Ethernet controllers have restriction in hardware. They were created to support (accommodate) ethernet frames + 802.1q or ISL. But it's not enough for EoMPLS tunnel.

As alternative you can use L2TPv3 - which will let you do fragmentation.