3.5. Configuring MAC Address Table

Function Introduction

MAC address table contains address information for the switch to forward traffic between ports. The address table includes these types of address:

• Dynamic address: the source address learnt by the switch and will be aged after aging time if this address is not hit. We only support IVL learning mode.

• Static address: the source address manually added by administrators.

Following is a brief description of terms and concepts used to describe the MAC address table:

• IVL: Independent VLAN Learning: for a given set of VLANs, if a given individual MAC Address is learned in one VLAN, it can’t be used in forwarding decisions taken for that address relative to any other VLAN in the given set.

• SVL: Shared VLAN Learning: for a given set of VLANs, if an individual MAC Address is learned in one VLAN, it can be used in forwarding decisions taken for that address relative to all other VLANs in the given set.

Reference to standard:IEEE 802.1D IEEE 802.1Q

Principle Description

N/A

Configuring Address Aging Time

The aging time is not exact time. If aging time set to N, then the dynamic address will be aged after N~2N interval. The default aging time is 300 seconds.

Switch# configure terminal

Switch(config)# mac-address-table ageing-time 10

Switch(config)# end

Switch# show mac address-table ageing-time
MAC address table ageing time is 10 seconds

Configuring Static Unicast Address

Unicast address can be only bound to one port. According to the picture, Mac-Da 0000.1234.5678 should forward via eth-0-1.

Switch# configure terminal

Switch(config)# mac-address-table 0000.1234.5678 forward eth-0-1 vlan 1

Switch(config)# end

Switch# show mac address-table
Mac Address Table
-------------------------------------------
(*) - Security Entry
Vlan Mac Address Type Ports
---- -------------- ------- --------
1 0000.1234.5678 static eth-0-1

Configuring Static Multicast Address

Multicast address can be bound to multi-port.According to the picture, Mac-Da 0100.0000.0000 can forward via eth-0-1 and eth-0-2.

Switch# configure terminal

Switch(config)# mac-address-table 0100.0000.0000 forward eth-0-1 vlan 1
Switch(config)# mac-address-table 0100.0000.0000 forward eth-0-2 vlan 1

Switch(config)# end

Switch# show mac address-table
Mac Address Table
-------------------------------------------
(*) - Security Entry
Vlan Mac Address Type Ports
---- -------------- ------- -------
1 0100.0000.0000 static eth-0-1 eth-0-2

Configuring MAC Filter Address

MAC filter will discard these frames whose source or destination address is set to discard. The MAC filter has higher priority than MAC address.

Switch# configure terminal

Switch(config)# mac-address-table 0000.1234.5678 discard

Switch(config)# end

Switch# show mac-filter address-table
MAC Filter Address Table
----------------------------------
Current count : 1
Max count : 128
Left count : 127
Filter address list :
----------------------------------
0000.1234.5678

Configuring MAC Filter Address with special VLAN

MAC filter will discard these frames whose source or destination address is set to discard with VLAN matches. The MAC filter has higher priority than MAC address.

Switch# configure terminal

Switch(config)# vlan 2

Switch(config-vlan)# exit

Switch(config)# mac-address-table 0000.1234.5678 discard vlan 2

Switch(config)# end

Switch# show mac address-table blackhole
Mac Address Table
-------------------------------------------
(*) - Security Entry (M) - MLAG Entry
(MO) - MLAG Output Entry (MI) - MLAG Input Entry
(E) - EVPN Entry (EO) - EVPN Output Entry
(EI) - EVPN Input Entry
Vlan Mac Address Type Ports
---- ----------- -------- -----
2 0000.1234.5678 blackhole drop