Re: (ASCEND) Re: How to bundle channels (>2)

["Joe Max" <max_and_tnt@hotmail.com>]

>From: Peter Lalor <plalor@infoasis.com>
>
>>From: Marc Eggenberger <me@everyware.ch>
>>
>>I have two locations with Ascend DslTNT's and both with a 24port high 
>>speed sdsl card (among others). What I want to do is bundle
>>channels between them. First only 2 sdsl lines but afterwards I'll
>>link 4 or 5.
>>
>>I know that with Frame Relay there is Multi Frame Relay. I don't
>>like this much because we mainly used ppp connections and no FR and
>>I don't have much knowledge of FR and don't feel that comfortable in 
>>deloying such a service.
>
>I wanted to try to respond to your post because, while you seem to
>have inadvertently excited a lot of people on the list, none actually 
>answered your question. I say "try", because I have not
>done what you want to do, although it should be trivial.
>
>The way I see it, you have three possibilities:
>
>1. Multilink Frame Relay. I'd suggest this method. It really isn't
>hard to set up FR, and MLFR is only slightly more complex.

>2. MPP. You could try using MPP to bond the lines.

MP (or MPP) should work just fine. SDSL lines are treated as
nailed calls, so you will need to set up nailed groups.


>3. Nailed groups. You could set all the SDSL lines you want to bond
>to the same nailed group and just use PPP. I have no idea if this
>works or not, but it's sure easy to try.

I presume what Peter meant here is to have multiple parallel PPP links 
between the TNTs. This is possible and it will give you multiple equal-cost 
parallel IP routes. Should any of them fail, the corresponding route will 
(should?) disappear and the others will take the slack.

An alternative is to use multiple FR links (instead of multiple PPP links) 
to implement the same equal-cost parallel IP routes.

However, be careful when using equal-cost parallel IP routes because you can 
inadvertendly cause severe TCP performance degradation. The degradation 
occurs when packets for the same data stream are reordered which may happen 
when they end up on different links.
Personally, I wouldn't recommend any solution that involves multiple 
parallel routes.

I suggest you experiment with #2 or #1 above (did you guess yet that I 
haven't tried either? :-)

-J

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