L2TPv3 link is unstable

[Abdallah Alkhader]

Hi All

I have the following setup,  I have two routers are running VPLS (VRF DATA), each one of those routers is connected to router(VSAT router) which is running L2TPV3 where the traffic coming from the MPLS  side passed through satellite see attahced pic

The ping and traffic between the VSAT routers is fine, but  once I Ping between MPLS routers its seem there is interruption see the output below

MPLS-Remote1# ping 192.168.30.1 repeat 100

Type escape sequence to abort.

Sending 100, 100-byte ICMP Echos to 192.168.30.1, timeout is 2 seconds:

!.!!!!!!..!!!!..!..!!!!!.!!.!!!!!!!!.!!!..!!..!!!!!!!!!!!!!!!!!!.!!.!.!!.!!.!!..!.!!!.!.!.!.!!!!!!!!

Success rate is 74 percent (74/100), round-trip min/avg/max = 504/512/576 ms (512 ms normal with satellite links)

P.S.   the delay of round trip packet through satellite is about 550 ms

Thanks

[Abdallah Alkhader]

Any suggestion

[Abdallah Alkhader]

any Help

[Peter Paluch]

Abdallah,

This is strange - perhaps that is why you are not getting any answers so far. I am myself quite at a loss with pinpointing the cause of this problem.

What I suggest to do is to try finding out the exact spot on the route between the MPLS routers where the packet losses start to occur. So I suggest first performing a traceroute from one MPLS router to another, and afterwards, I suggest testing the repeated ping to each router in this traceroute output in succession, and focusing on the router that first starts exhibiting packet losses. Do you think you could try this out?

Thanks! Please let us know.

Best regards,

Peter

[renzopaolo]

Hi abdalah,

you're trying do ping with packets of size 100 bytes,this produce a lot of fragmentation and reassembly on routers VSAT.

Please could you do ping extended from and to routers MPLS and set the following (DF bit set , verbose and sweep range (1460 - 1475). Now when do you have the max size of packets that the link can pass, try again a ping with the max size resulting and repeat 100.

Regards,

Renzo Tovar

[Abdallah Alkhader]

Hi all,

Thanks for your support, the issue was bad port

thanks