[c-nsp] bonded T1s into 7206VXR

[Paul Stewart]

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Hi Adam...

It depends on your config... you can use load-sharing per-packet or
load-sharing per-destination

for example..

interface Serial3/1
~ ip address 192.168.1.13 255.255.255.252
~ ip load-sharing per-packet
~ serial restart-delay 0
~ no fair-queue
~ no cdp enable
!
interface Serial3/2
~ ip address 192.168.1.9 255.255.255.252
~ ip load-sharing per-packet
~ serial restart-delay 0
~ no fair-queue
~ no cdp enable

This setup has two T1's going to another ISP.  We used private IP's for
the point to point, but now we prefer public IP's... regardless you'll
see the "ip load-sharing per-packet" statement.  This is the deciding
factor as to how the packets get balanced.  Same holds true for three or
four T1's as well...  with per-packet you can get the full 4.5Mb/s that
you describe to one single session...

Per packet basically alternates every packet between the available
connections keeping an even traffic flow on each T1.

If you use per-destination, then the source-destination IP  is mapped to
a specific T1 for the duration of the session therefore you get
unbalanced T1's but more "even" packet delivery.  With this setup you
will only get 1.544Mb/s for one session, while other sessions use the
other T1's...

I doubt the addition of another card will have an effect on performance
for the setup you described...

Paul


Adam Greene wrote:
| Hi all,
|
| I am considering getting 4.5M bonded T1 service from AT&T. I currently
have
| (1) T1 from them into a 7206VXR with a PA-MC-2T1 card. If I get the bonded
| T1 service, I will probably put in another PA-MC-2T1 or a PA-MC-4T1. We'll
| run BGP4 over the circuit.
|
| My question is: will this bonded T1 service act like a single circuit?
I.e.
| if I have a single TCP connection that needs, say 4M bandwidth, will the
| bandwidth be equally distributed across all three 1.5M circuits? 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.
|
| Thanks for any advice....
| A
|
|
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