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When troubleshooting Layer 2 issues, verify:
-
That the MAC addresses are learned, in the correct Virtual
LAN (VLAN), and are not blackhole entries.
- To display FDB entries, use the show fdb command.
-
Your VLAN configuration, including the VLAN tag, ports
in the VLAN, and whether or not the ports are tagged.
-
To display detailed information for each VLAN
configured on the switch, use the show vlan detail command.
For additional VLAN troubleshooting tips, see VLANs.
-
To display detailed information for each VLAN
configured on the switch, use the show vlan detail command.
-
Your Spanning Tree Protocol (STP) configuration, including
the STP domain (STPD) number, VLAN assignment, and port state.
-
To display STP information, use the following
commands:
show stpd detail—Displays the STP settings on the switchshow stpd ports—Displays the STP state of a portshow vlan stpd—Displays the STP configuration of the ports assigned to a specific VLAN
For additional STP troubleshooting tips, see STP.
-
To display STP information, use the following
commands: