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Configuring High Availability VLANs

page 3-14

Release 5.1.6.R02 User Guide Supplement

To remove a MAC address associated with a high availability VLAN, use the no form of the mac-
address-table port-mac vlan mac command. For example, the following command removes MAC 
address 00:25:9a:5c:2f:10 from VLAN 20:

-> mac-address-table port-mac vlan 20 no mac 

00:25:9a:5c:2f:10 

To remove more than one MAC address from a high availability VLAN using a single command, enter 
each address on the same command line separated by a space. For example, to remove MAC addresses 
00:25:9a:5c:2f:11, 00:25:9a:5c:12, and 01:00:00:3f:4c:10, from high availability VLAN 30, you would 
enter:

-> mac-address-table port-mac vlan 30 no mac 

00:25:9a:5c:2f:11 00:25:9a:5c:12 

01:00:00:3f:4c:10.

Note. Removing the last MAC address from an HA VLAN is not allowed. Deleting the VLAN is required 
when there is only one MAC address left.

One scenario using HA VLANs involves configuring ingress ports on one switch and egress ports on a 
second switch. In this case, the ports that connect the two switches require an 802.1Q tag for the HA 
VLAN. 

The 

 command is used to tag a port with an HA VLAN. Once this is done, the tagged ports are 

identified as inter-switch ports and will carry HA VLAN traffic between the two switches. See 

 for an example of using inter-switch ports.

Note the following regarding inter-switch ports:

• Fixed ports, 802.1Q tagged ports, and link aggregates on a second-generation module are eligible to 

become inter-switch ports for HA VLANs. 

• Once a link aggregate is tagged with an HA VLAN, it is not possible to add any more member ports to 

the aggregate.

• The HA VLAN and the default VLAN for an inter-switch port should participate in the same Spanning 

Tree instance, especially when there are redundant inter-switch connections. If this is not possible—
such as when the 1x1 mode is active and there is one instance per VLAN—then ensure that the Span-
ning Tree state of the inter-switch port remains the same for both VLANs. 

For more information about 802.1Q tagging, see 

Chapter 10, “Configuring 802.1Q.”

 For more informa-

tion about Spanning Tree modes and instances, see 

Chapter 6, “Configuring Spanning Tree Parameters,”

 

and 

Chapter 3, “Using 802.1s Multiple Spanning Tree.”