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port flapping and web filter

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I have persistent syslog message being sent from my 4510R regarding
'vlan 4 is flapping between two ports'. One of the ports is the link to
my external firewall, the other is the blocking port of my web filter. I
am assuming that this is probably normal behavior for this setup, I am
just curious if there is anything I need to do or watch for?

If this is normal behavior, is there any way to turn off the messages
for specific interfaces so that they are not sent to my kiwi box every
few seconds?
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