Is there a way to either use SNMP or some other menas of management to limit the bandwidth on a 3550 switch port based on time of day? I want to allow a port used for disaster recovery and backups full bandwitch at night but limit it during the day when it will impact other users.
you could combine a policer with a time-based access-list describing the traffic to be policed. Just make sure you use ntp as well, otherwise after a reload your 3550 defines day and night through local system clock not in sync with the rest of the world ... which could be desastrous.
Check the following links for configuration options:
"Understanding QoS Policing and Marking on the Catalyst 3550"
the ACL will either completely block traffic or allow it. Depending on your requirements this might be the proper approach. But then you need to make sure all necessary traffic does not get blocked, like administrative access or the like.
A policer will allow traffic, but provide an upper speed limit.
Which option is favourable in your specific case depends on your policy regarding proper network use.
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