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Arista EOS MAC Address Table: Show Commands and Aging

Arista EOS MAC Address Table: Show Commands and Aging

Arista EOS MAC address table (FDB) commands: show mac address-table, dynamic vs static entries, aging timers, hardware limits and flapping-MAC trouble

admin admin 2026-09-06
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Troubleshoot MAC Flaps and Layer 2 Loops on Catalyst Switches

Troubleshoot MAC Flaps and Layer 2 Loops on Catalyst Switches

Fix MAC flapping on Cisco Catalyst switches: read %SW_MATM-4-MACFLAP_NOTIF logs, trace the flapping MAC hop by hop, and apply UDLD and storm control.

admin admin 2026-08-27
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Unexpected MAC Learning on Catalyst 9000 Switches

Unexpected MAC Learning on Catalyst 9000 Switches

Catalyst 9300 learned the gateway MAC on random access ports, breaking a VLAN. How packet reflection, dot1x MAB and stuck MACs caused it, proven with

admin admin 2026-08-23
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