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D-4

MAC Address Management

Determining MAC Addresses

CLI: Viewing the Port and VLAN MAC Addresses

The MAC address assigned to each switch port is used internally by such

features as Flow Control and the Spanning Tree Protocol. Using the walkmib

command to determine the MAC address assignments for individual ports can

sometimes be useful when diagnosing switch operation.

The switch allots 24 MAC addresses per slot. For a given slot, if a three-port

module is installed, then the switch uses the first three MAC addresses in the

allotment for slot 1, and the remaining 21 MAC addresses are unused. If a six-

port module is installed, the switch uses the first six MAC addresses in the

allotment, and so-on. The switch’s base MAC address is assigned to VLAN

(VID) 1 and appears in the walkmib listing after the MAC addresses for the

ports. If multiple VLANs are configured, the MAC addresses assigned to these

VLANs appear after the base MAC address.

To display the switch’s MAC addresses, use the walkmib command at the

command prompt:

Note This procedure displays the MAC addresses for all ports and existing VLANs

in the switch, regardless of which VLAN you select.

1. If the switch is at the CLI Operator level, use the enable command to enter

the Manager level of the CLI.

2. Type the following command to display the MAC address for each port on

the switch:

HP4108# walkmib ifPhysAddress

(The above command is not case-sensitive.)

For example, with a six-port module in slot 1, a three-port module in slot 3,

and three VLANs present:

!Software.book Page 4 Thursday, October 10, 2002 6:10 PM

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