Probably not. You're limiting all 3 hosts aggregate to 3 Mbps, but did you want to limit each to 3 Mbps?
Also, the policy is only applied in the output direction on the gig interface, what about the reverse direction?
Further, it's not clear what's actually trying to be accomplished. If the issue bandwidth consumption on the serial link? If so, policing after the traffic has crossed the link (inbound) doesn't give precise results. If it's a question of about outbound bandwidth on the serial link, CBWFQ with bandwidth allocations might be a better choice.
"Does this add a lot of overhead to the router?"
Policing generally doesn't.
"How would I do this config for the three IP addresses? "
We have a 21mbs DS3 connection. Our LAN, web server, FTP server and mail server use this DS3 connection.
I'm trying to prevent our web and FTP server from using up all the bandwidth. I would like the web server, FTP server and mail server to each have a maximum of 3mbs of bandwidth. In peak conditions this would leave 12mbs available for our LAN connection.
Is the config you provided a good way of doing this? Thanks.
For outbound, I would suggest your first try FQ for all traffic.
int serial 1/0
service-policy output anExample
If that isn't enough (and it might be vs. a default FIFO on a high speed serial), you can further extend the CBWFQ policy. You could weight traffic types (or per source server) differently (somewhat effective if the FQ is actually WFQ - many platforms IOSs are) or you can break the servers into other classes and adjust their class parameters.
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