Cisco Systems WSC4500X16SFP Manual De Usuario

5-3

Software Configuration Guide—Release 12.2(25)SG

OL-7659-03

Chapter 5 Checking Port Status and Connectivity

Displaying MAC Addresses

In addition to displaying the MAC address range for a module using the show module command, you
can display the MAC address table information of a specific MAC address or a specific interface in the
switch using the show mac-address-table address and show mac-address-table interface commands.

This example shows how to display MAC address table information for a specific MAC address:

Switch# show mac-address-table address 0050.3e8d.6400

vlan mac address type protocol qos ports

-----+---------------+--------+---------+---+--------------------------------

200 0050.3e8d.6400 static assigned -- Switch

100 0050.3e8d.6400 static assigned -- Switch

5 0050.3e8d.6400 static assigned -- Switch

4 0050.3e8d.6400 static ipx -- Switch

1 0050.3e8d.6400 static ipx -- Switch

1 0050.3e8d.6400 static assigned -- Switch

4 0050.3e8d.6400 static assigned -- Switch

5 0050.3e8d.6400 static ipx -- Switch

100 0050.3e8d.6400 static ipx -- Switch

200 0050.3e8d.6400 static ipx -- Switch

100 0050.3e8d.6400 static other -- Switch

200 0050.3e8d.6400 static other -- Switch

5 0050.3e8d.6400 static other -- Switch

4 0050.3e8d.6400 static ip -- Switch

1 0050.3e8d.6400 static ip -- Route

1 0050.3e8d.6400 static other -- Switch

4 0050.3e8d.6400 static other -- Switch

5 0050.3e8d.6400 static ip -- Switch

200 0050.3e8d.6400 static ip -- Switch

100 0050.3e8d.6400 static ip -- Switch

Switch#

This example shows how to display MAC address table information for a specific interface:

Switch# show mac-address-table interface gigabit 1/1

Multicast Entries

vlan mac address type ports

-------+---------------+-------+-------------------------------------------

ffff.ffff.ffff system Switch,Gi6/1,Gi6/2,Gi6/9,Gi1/1

Switch#

Checking Cable Status Using TDR

You can use the Time Domain Reflectometer (TDR) feature to determine if cabling is at fault when you
cannot establish a link.

Note

This test is especially important when replacing an existing switch, upgrading to Gigabit Ethernet, or
installing new cable plants.