Bond 2 T1 interface

Unanswered Question
Mar 14th, 2007

How to bond to T1 ? Besides Mux any other way we can bond 2 T1 lines works line one pipe.

I have this problem too.
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Richard Burts Wed, 03/14/2007 - 09:35

Nilesh

multilink ppp is a very effective alternative for bonding 2 T1s so that they act like one pipe.

The basics of configuring it would look something like this:

interface Multilink1

ip address X.X.X.X 255.255.255.252

ppp multilink

multilink-group 1

!

interface Serial0/0

no ip address

encapsulation ppp

ppp multilink

multilink-group 1

!

interface Serial0/1

no ip address

encapsulation ppp

ppp multilink

multilink-group 1

Note that the IP address (and any other layer 3 configuration) goes on the multilink interface and there is no IP address or any other layer 3 information on the serial interfaces.

HTH

Rick

nilesh276 Wed, 03/14/2007 - 09:56

Hi Rick,

Thanks for reply. I know that but I think that feature designed for ISDN do you think its also works for T1 leased line very well...........I am not sure thats why !!!

nilesh276 Wed, 03/14/2007 - 11:13

Does it works for 2 private T1 lines or also good for 2 T1 Internet lines? Suppose I have 2 T1 from same ISP & 2 T1 from different ISP same for Private line ??

Richard Burts Wed, 03/14/2007 - 11:18

Nilesh

I do not believe that it makes any difference whether the T1s are private lines or Internet lines. It should work fine for either.

I have never done multilink on lines from different providers so I can not speak from experience about this. There has been some discussion suggesting that the different latencies possible when lines are from different providers could create performance problems with multilink. I do not believe that anyone has had a definitive answer about this.

HTH

Rick

Paolo Bevilacqua Wed, 03/14/2007 - 10:48

Not only for T1, there is people using MLPPP for OC-12 lines using specialized cards on big switches !!!

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