Cisco Systems RJ-45-to-AUX manual Viewing the CAM MAC Address Table on a CLI−Based IOS, 328

Port path cost 100, Port priority 128

Designated root has priority 32768, address 0000.0C00.4BD0

Designated bridge has priority 32768, address 0030.8054.6C00

Designated port is Ethernet 0/12, path cost 100

Timers: message age 20, forward delay 15, hold 1

Port Ethernet 0/25 of VLAN1 is Forwarding

Port path cost 100, Port priority 128

Designated root has priority 32768, address 0000.0C00.4BD0

Designated bridge has priority 32768, address 0030.8054.6C00

Designated port is Ethernet 0/25, path cost 100

Timers: message age 20, forward delay 15, hold 1

Port FastEthernet 0/26 of VLAN1 is Blocking

Port path cost 10, Port priority 128

Designated root has priority 32768, address 0000.0C00.4BD0

Designated bridge has priority 32768, address 0030.8054.6C00

Designated port is FastEthernet 0/26, path cost 100

Timers: message age 20, forward delay 15, hold 1

Port FastEthernet 0/27 of VLAN1 is Blocking

Port path cost 10, Port priority 128

Designated root has priority 32768, address 0000.0C00.4BD0

Designated bridge has priority 32768,		address 0030.8054.6C00
Designated port	is FastEthernet 0/27,	path cost 100
Timers: message	age 20, forward delay	15, hold 1

Viewing the CAM (MAC Address) Table on a Set/Clear Command−Based IOS

A switch uses the CAM table to make forwarding decisions on the switch. Let’s take a look at the available command options, syntaxes, and an example of the output using the show cam command:

Catalyst5002> (enable) show cam ?

Usage: show cam [count] <dynamicstaticpermanentsystem> [vlan] show cam <dynamicstaticpermanent> <mod_num/port_num>

show cam <mac_addr> [vlan] show cam agingtime

Catalyst5002> (enable) show cam dynamic 2

VLAN	Dest MAC/Route Des	Destination Ports or VCs
2	00−30−19−4C−80−A6	2/4
2	00−30−19−4C−80−A8	2/18
2	00−30−19−4C−80−A6	2/15
2	00−30−19−4C−80−A6	2/12
2	00−30−19−4C−80−BC	2/9
2	00−30−19−4C−80−3F	2/10
2	00−30−19−4C−80−D4	2/6
2	00−30−19−4C−80−B3	2/7
2	00−30−19−4C−80−A2	2/2
2	00−80−00−00−12−D0	2/22
2	00−30−19−4C−80−C4	2/1
2	00−30−19−4C−80−3B	2/23
Total	Matching CAM Entries Displayed = 12

Viewing the CAM (MAC Address) Table on a CLI−Based IOS

On a CLI−based IOS, the show mac command is used to view the CAM table that makes forwarding decisions for frames arriving on the switch. Let’s take a look at the output using the show mac command:

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