How to Know If I need to Upgrade my older Cisco 2811 Routers?

The environment is virtual servers in a remote data center(cloud, I guess) with a 30Mbs pipe to a fully meshed MPLS WAN with 20 T1 lines to branch locations.  All routers are older Cisco 2811 10/100 routers.  There is a mixture of older CLI 10/100 thin clients and 10/100 PCs.  Aside from terminal services issues, application issues, and a 32-bit environment, what are the reasons to upgrade the routers?  What are the questions to ask?

Thank you!
mcarsonsrAsked:
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asavenerCommented:
Find out if they're end-of-sale or end-of-life.  Do you have smartnet?  How much to renew?  What OS release are you on, and how long will updates be released?

What will your future state look like?  Will the routers have the capacity and/or flexibility you need?
David Johnson, CD, MVPOwnerCommented:
End-of-Sale Date:       01-NOV-2011
End-of-Support Date:       01-NOV-2016
if they currently support your needs then I'd not worry until next November and then think about upgrading if you need more capabilities.

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asavenerCommented:
Well, it depends on what their design, procurement, and implementation lead time is....
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mcarsonsrAuthor Commented:
Thank you both for your responses.  I realize the question is somewhat lacking in details.  The network in question is performing very poorly and I understand there are numerous and competing issues that could be causing the network congestion.  Your feedback is helpful.

I should have asked if there is a definitively check list or guide that network engineers/admins go through to diagnose congestion issues in such a network.

I am not a network engineer, but I have recently read extensively on the subject and there do appear to be countless issues to check into and a number of ways to review network traffic for bottlenecks, but is there a comprehensive guide for someone to refer to?

Thanks again
asavenerCommented:
The two first things I'd look for are sustained high CPU utilization or sustained link utilization above about 85%.

(The low-ish threshold is that interfaces experiencing a synchronized TCP restart can sometimes look underutilized even though traffic is spiking to 100%, then packet getting dropped, TCP windows all reset, and then traffic builds back to 100% where the cycle starts over again.)

Check out MRTG and PRTG.
mcarsonsrAuthor Commented:
Thank you asavener!
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