Catalyst Troubleshooting Tools
585
Switch_A> (enable) show cam dynamic 1
VLAN Dest MAC/Route Des Destination Ports or VCs
1 00-80-2f-9f-54-5f 2/3
1 00-08-27-ca-c9-cd 3/18
1 00-08-27-ca-cd-da 3/23
1 00-08-27-ca-d1-20 3/27
1 00-08-27-29-89-80 3/44
1 00-08-27-29-88-a7 4/41
1 00-08-27-d2-ce-43 4/1
1 00-08-27-9a-0e-e9 3/13
1 00-08-27-ca-db-5e 4/38
1 00-08-27-ca-db-70 4/30
1 00-08-27-29-82-5d 2/22
1 00-08-27-8c-fd-e5 3/7
1 00-08-27-8c-fc-c0 3/32
1 00-08-27-d2-f8-10 4/43
1 00-08-27-ca-e0-47 4/29
1 00-08-27-ca-e0-6c 2/20
1 00-08-27-d2-fd-ab 3/2
1 00-08-27-d2-fe-4a 4/36
1 00-08-27-d2-fe-f5 2/24
1 00-08-27-d2-ff-c7 2/23
1 00-08-27-d2-ff-dd 4/45
1 00-08-27-d2-f1-87 2/8
Total Matching CAM Entries Displayed = 21
Duplicate MAC Addresses
Some network devices may be configured with the same MAC address on each
interface, including certain dual-homed UNIX workstations. This is a common
event that can create substantial problems in the network. The show cam com-
mand is one of the best methods for finding this issue, although prevention via
communication and change control can be more beneficial. If the administration
of workstations and network services is divided in an administrator's organiza-
tion, it is recommended that this issue be reviewed and that duplicate MAC
addresses be used only when required. Documentation of the installation should
accompany such a decision.
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