Folks, I need to write standard for WAN routers to be placed on our branch offices, MPLS network.
Current standard is 2851 routers.
I am considering 2821 instead.
My question is:
In 6 years from now, do you see circuits cost decreasing so that it would be justifiable getting a bigger route to handle bigger circuits?
Currently I have major sites running up to 4xT1's and I could do that just fine with a 2821 instead of 2851.
Similar to Collin, I think 6 years to too long a timeframe for deciding what model router to install today.
Cisco's recommendations for sizing their ISRs, I think, is very conservative (but safe). If you look at the Fast/CEF switching Mbps ratings in the attachment for the various 2800 models, you might find sizing at about 25% of the Mbps rating provides a reasonable cap for duplex bandwidth being processed by the box for "normal" traffic processing. Using that as a guideline, 4xT1 shouldn't be a problem for a 2821 and even a 2811 might suffice. (Load might also depend on how you use use multiple T1s, e.g. separate links, bonded with MLP, bonded with MLP using fragmentation, bonded with ATM IMA.)