Name: Cisco IE 3000
Brand: Cisco
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7-20

Cisco IE 3000 Switch Software Configuration Guide

OL-13018-01

Chapter 7 Administering the Switch

Managing the MAC Address Table

• Configuring MAC Address Notification Traps, page 7-21

• Adding and Removing Static Address Entries, page 7-23

• Configuring Unicast MAC Address Filtering, page 7-24

• Displaying Address Table Entries, page 7-26

Building the Address Table

With multiple MAC addresses supported on all ports, you can connect any port on the switch to

individual workstations, repeaters, switches, routers, or other network devices. The switch provides

dynamic addressing by learning the source address of packets it receives on each port and adding the

address and its associated port number to the address table. As stations are added or removed from the

network, the switch updates the address table, adding new dynamic addresses and aging out those that

are not in use.

The aging interval is globally configured. However, the switch maintains an address table for each

VLAN, and STP can accelerate the aging interval on a per-VLAN basis.

The switch sends packets between any combination of ports, based on the destination address of the

received packet. Using the MAC address table, the switch forwards the packet only to the port associated

with the destination address. If the destination address is on the port that sent the packet, the packet is

filtered and not forwarded. The switch always uses the store-and-forward method: complete packets are

stored and checked for errors before transmission.

MAC Addresses and VLANs

All addresses are associated with a VLAN. An address can exist in more than one VLAN and have

different destinations in each. Unicast addresses, for example, could be forwarded to port 1 in VLAN

and ports 9, 10, and 1 in VLAN 5.

Each VLAN maintains its own logical address table. A known address in one VLAN is unknown in

another until it is learned or statically associated with a port in the other VLAN.

Default MAC Address Table Configuration

Table 7-3 shows the default MAC address table configuration.

Ta b l e 7-3 Default MAC Address Table Configuration

Feature Default Setting

Aging time 300 seconds

Dynamic addresses Automatically learned

Static addresses None configured

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