Brocade 6910 Ethernet Access Switch Diagnostic Guide (Supporting R2.2.0.0) - Manual (Page 34)

24 Brocade 6910 Ethernet Access Switch Diagnostic Guide
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DRAFT: BROCADE CONFIDENTIAL
MAC address learning
ARP age
The ARP age is the amount of time the device keeps a learned MAC address in the ARP cache. The
device resets the timer to zero each time the ARP entry is refreshed and removes the entry if the
timer reaches the ARP age. The default ARP age is 20 minutes.
Changing the ARP aging period
When the switch places an entry in the ARP cache, it also starts an aging timer for the entry. The
aging timer ensures that the ARP cache does not retain learned entries that are no longer valid. An
entry can become invalid when the device with the MAC address of the entry is no longer on the
network.
ARP age affects dynamic entries only.
MAC address learning show commands
The following command displays information about the MAC address table.
show mac-address-table
Syntax: show mac-address-table
This command displays the MAC address table, which contains MAC addresses learned from other
devices. This table does not contain the MAC addresses of the Brocade device ports.
Console# show mac-address-table
Total entry in system: 3
Interface MAC Address VLAN Type Life Time
--------- ----------------- ---- -------- -----------------
CPU 70-72-CF-32-DD-FD 1 CPU Delete on Reset
Eth 1/ 1 00-01-EC-F8-D8-D6 1 Learn Delete on Timeout
Eth 1/ 1 00-E0-29-94-34-64 1 Learn Delete on Timeout
MAC address learning debug commands
The following command displays information about the MAC address table.
debug hardware dev-amtrdrv
Syntax: debug hardware dev-amtrdrv {mac-table | vidx-table}
• mac-table - Displays all MAC address entries.
• vidx-table - Displays all multicast entries.
This command shows all MAC entries maintained by the address table management driver
(operating in the system ASIC).
Console#debug hardware dev-amtrdrv mac-table
MAC Vid Unit/Port IsTrunk TrunkId Is_Static age_flag Idx
----------------- ---- --------- ------- ------- --------- -------- -----
74-8E-F8-68-02-30 1 1/2 0 0 1 0 40
00-E0-29-94-34-64 1 1/1 0 0 0 1 41
00-E0-0C-10-90-07 1 1/1 0 0 0 1 3108