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2911 sizing chart

I have a customer with 4 x isdn 30s and now they wish to add another 2 making 6 -- i can get all the cards 3 x VWIC3-2MFT-T1/E1 and PVDM etc but is there any sizing chart which tells you when to upgrade to a bigger switch and how much capacity in processing  this will be using 

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Router sizing often is based on aggregate traffic expected to transit router and its configuration.  The attachment will explain more for ISRs.

 

Router selection is sometimes hardware component restricted too.  For that, you need to carefully review the device specs and release notes.  E.g. are 3 VMICs supported in a 2911.

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