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Community Member

max-out of LAN

1. Is there a formula/computation for figuring out how many switches or max-backplane availability which can be used on the LAN behind a router?

2. I have sites using 2516 series routers with up to 6 cat2924, cat2820 and cat1924.

3. Other than waiting for customer complaints, how do I figure when to upgrade the router?


Re: max-out of LAN

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you, or there is no public information available at this time. If you don't get a suitable response to your post, you may wish to review our resources at the online You may also contact our product information line at 1-800-553-NETS or a Cisco Systems Engineer at your local Cisco office or reseller. To locate your local Cisco representative, visit

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.


Re: max-out of LAN

I don't know of a formula , the best way is just to keep an eye on the router and watch the CPU utilization along with the individual interface utilization to make sure the router isn't being overloaded .

Community Member

Re: max-out of LAN

1. Thanks Glen. There doesn't appear to be any "scientific" way to do it.....more of an art form/customer complaint issue than anything else.

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