Unanswered Question
Mar 9th, 2009


We are having 2 STM-1 in 7613 Router,In One STM-1 we are having one ISP Link and second STM-1 We are having 2 ISP which is comming from E1 To STM-1 Converter. So now Problem is when We are Doing Multilink with Second STM-1 (with 2 Diff ISP) Multilink Link Working Fine.But If We are Doing One Link From STM-1 and Other Link From Second STM-1 then We are doing MultiLink It's Not Working??? So what is the Problem we can't Understand.....

I have this problem too.
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Giuseppe Larosa Tue, 03/10/2009 - 01:34

Hello Jayesh,

there are limitations in the hardware: where the two STM-1 connected ?

Are two ports in the same SPA or PA in a flexwan ?

for example I see a single channelized STM-1 SPA


1-Port Channelized STM-1/OC-3 SPA

155 Mbps


155 Mbps


The following are link restrictions for using MLPPP:

-Only T1 or E1 links may be in a bundle.

->>> All links must be on the same SPA.

-A maximum of 12 links may be in a bundle.

so if you try to make a MLPPP with E1 taken from two SPAs it cannot work.

This is an hardware limitation.

Hope to help


Jayesh Prajapati Thu, 03/12/2009 - 08:26


Thankyou ,but can we do link this way

we are having Enhanced FlexWAN module WS-X6582-2PA card in 7613 so can we put 2 PA-MC-STM1 card in Enhanced FlexWAN module WS-X6582-2PA and then we can multilink each other ?? is this is possible???

Giuseppe Larosa Thu, 03/12/2009 - 10:19

Hello Jayesh,

again the answer is no:

it is not possible to bundle two E1 that are in two different channelized Port Adapters:

the reason is that the flexwan has two cpus and cpu0 handles bay 0 and cpu1 handles bay 1.


Restrictions and Usage Guidelines

The following restrictions apply to the Distributed Multilink PPP feature:

>>•All lines in a bundle must reside on the same port adapter.

You should think to use the two E1 as separate indipendent links if you cannot use an ADM to have both E1 on the same channelized STM-1 link.

Hope to help



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