01-19-2012 07:19 AM - edited 03-07-2019 04:26 AM
I have one VLAN on a 3750 where I do not see any MAC addresses even though it is in use. This is an unrouted VLAN between a WLC on a port-channel/LAG and an access port to an ASA for guest traffic. When I do a show MAC add I get nothing for VLAN 60 (guest DMZ) but all other VLANs seem to be OK. Spanning tree is not showing TC counters incrementing either.
I also was told when put a port on this VLAN the laptop did not get a DHCP address form the ASA, but the wireless guest clients are working fine. I can see the DHCP leases and ARP entries in the ASA and the ASA ARP in the WLC so some traffic is passing fine. I'm not onsite right now so troubleshooting is all remote which limits some options.
Any ideas on why there would be no MAC addresses for just one VLAN?
01-19-2012 07:40 AM
Type 'show vlan' and make sure Vlan 60 is on the L2 Vlan Database and shows as ACTIVE.
01-19-2012 07:46 AM
Yes it is there and active.
60 GuestWirelessDMZ active Gi2/0/1, Gi2/0/43
I wish the port-channels showed up in the show vlan. If there any tuning (by allowed or pruning) of vlans it slows troubleshooting compared to other vendor switches where trunks are displayed.
01-19-2012 07:47 AM
show int trunk
01-19-2012 07:52 AM
My point exactly an extra step. IMHO I'd like it to be displayed in the show vlan to keep it all together.
Still not understanding why the MAC table is empty...
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