Just to piggy-back on this, +1 on #3.  You could use that 1841, you'll just 
need two T1 WICs.  This in turn will "bond" the Ts into one pipe.

Shook

From: Rohyans, Aaron [mailto:[email protected]]
Sent: Friday, February 13, 2009 10:55 AM
To: NT System Admin Issues
Subject: RE: 2 T1's + 2 seperate routers = load balanced?

There are several ways to achieve some form of load balancing....


1.       Get another router to sit directly behind the 2 T1 routers and act as 
the default gateway for your LAN.  Use this router to policy-route traffic 
across the two T1s.  You won't achieve true load-balancing, but you can at 
least segment your "junk" traffic to one T1 and your "business critical" 
traffic to another.  Plus, you have an automated failover solution in that if 
one T1 goes down, the router can automatically redirect traffic to the still 
active T1 router.

2.       You'll have to use BGP to create a peering between you and your 
provider.  Then, use BGP to "influence" which T1 will receive traffic.  I doubt 
your provider will do this for you though as it's a lot of work for a "small" 
customer :).

3.       Combine the circuits into one router and ask your provider to run 
MLPPP with you (this is probably the best solution).

4.       Buy a load balancer like Radware or the like and let it manage the 
load balancing for you.

Hope this helps,

Aaron T. Rohyans
Senior Network Engineer
CCIE #21945, CCSP, CCNA, CQS-Firewall, CQS-IDS, CQS-VPN, ISSP, CISP, JNCIA-ER
DPSciences Corporation
7400 N. Shadeland Ave., Suite 245
Indianapolis, IN 46250
Office:  (317) 348-0099
Fax:   (317) 849-7134
[email protected]<mailto:[email protected]>
http://www.dpsciences.com/

From: Cameron Cooper [mailto:[email protected]]
Sent: Friday, February 13, 2009 10:41 AM
To: NT System Admin Issues
Subject: 2 T1's + 2 seperate routers = load balanced?

We moved a T1 from our remote office to our main office and now have the two 
T1's running.  What we would like to do is load balance or combine the two T1's 
to create a bigger internet pipe for our main office.  At the moment we have 
two different routers, Adtran NetVanta 3200 and a Cisco 1841 T1, can we take 
the two different routers and create the bigger pipe or will we need to 
purchase a router that will allow us to do this?

_______________________________
Cameron Cooper
IT Director - CompTIA A+ Certified
Aurico Reports, Inc
Phone: 847-890-4021    Fax: 847-255-1896
[email protected]<mailto:[email protected]>












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