[c-nsp] bonded T1s into 7206VXR

[Adam Greene]

Thanks, all, for these very helpful replies. I did a little digging into ip
load-sharing per-packet and see that although this technique will spread the
traffic evenly over multiple links, packets may arrive out of order, which
could cause performance problems for VoIP and some video streams.

I'm wondering if Jason's suggestion of using PPP encapsulation and BGP with
multiple paths over the circuits is the same as Mark's MLPPP suggestion.
Perhaps this is the best way to spread out the bandwidth while keeping
packets in order.

--Adam

----- Original Message ----- 
From: "Mark Kent" <mark at noc.mainstreet.net>
To: <cisco-nsp at puck.nether.net>
Sent: Monday, February 21, 2005 12:47 PM
Subject: [c-nsp] bonded T1s into 7206VXR


> >> I am considering getting 4.5M bonded T1 service from AT&T.
>
> I can think of six ways that this "bonded" service
> could be delivered:
>
> 1) a csu/dsu that takes multiple T1 and spits out a hssi port
>    that is indistinguishable from a hssi port on the
>    router side of a (fract-)DS3 csu/dsu.
>
> 2) MLPPP
>
> 3) int sX/Y
>      ip load-sharing per-packet
>
> 4) ATM imux
>
> 5) int sX/Y
>      no ip route-cache
>    and route equally out each each interface
>
> 6) int sX/Y
>      ip route-cache
>    and route equally out each each interface
>
> I've ordered them according to my preference.
>
> >> will this bonded T1 service act like a single circuit?
>
> The answers are
>
> 1) yes
> 2) yes, with some cpu load,
>    and will take care of out-of-order packets
> 3) yes, with some cpu load
> 4) yes, with that annoying ATM overhead, better get 4xT1
> 5) not sure; I'm not sure what the difference is
>    between this one and 3).
> 6) No.
>
> >> I am also wondering if the bonding will work any differently if the
> >> (3) T1's are across (2) PA-MC-2T1 cards vs a single PA-MC-4T1 card
>
> I'm 99% sure the answer is No, it won't be different.  Note that you
> need a different card for 1) and 4).  And none of these actually
> requires the MC part of the T1 port, although I understand you get a
> built-in csu/dsu in that case.
>
> -mark
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