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ISDN And SDSL Load Sharing

Posted on 2004-09-29
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Last Modified: 2012-06-21
I have a high profile remote site which is currently using a E1 Frame Relay for its primary and a 10-channel ISDN as its backup connectivity.  The E1 is pretty congested at the moment which I am addressing by having a 2nd E1 installed (as I said they are high-profile !).  Anyway I have ordered a 1Meg SDSL connection and plan to use this for backup until the second E1 arrives (looking at a couple of months - God Bless carriers !!!!)
My question is this:
Can I configure the ISDN and SDSL to do some kine od load sharing in the event of a failure ?  I have already built the Frame/SDSL scenario for other offices and it works fine using GRE tunnels & IPSec.........It just seems a bit of a waste of 1/2 a Meg of bandwidth on the ISDN sitting idle if I can use it...............
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Question by:jajjones
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td_miles earned 2000 total points
ID: 12196506
load sharing is a little different to failover.

With failover, you are taking all of the traffic that was previously going down one link and simply rerouting it over another link.

With load sharing, you need to split the traffic between the two (or more) links. There are numerous technologies for doing this, but paramount to making it work is the fact that both ends need to support it and know about it.

There are no standards for load sharing between an ISDN link & ADSL line. For inbound traffic, you would need to use something like BGP to advertise the two routes (over the different links) to load share at an IP level. It it was for outbound traffic only, then two equal cost routes (one for ISDN, one for ADSL) should work.

Maybe I'm not quite reading it correct, but you have an E1, that currently has 640k ISDN as backup. You now have a DSL line that you are going to use as the backup to the E1. If you are happy with the E1 with DSL backup, why not just cancel the ISDN ?
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