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This is the only thing we found. we are trying it out tonight https://supportforums.cisco.com/discussion/12162221/catalyst-4506-e-sup-8e-arp-issues-any-vlan?referring_site=bss&channel=bdp
I ran into the same issue this morning. For us its more like a few hours but forcing a switchover is the only way to bring things back up.Anyone else run into this ?