Configuring Metro Features
December 2005 © Foundry Networks, Inc. 8 - 3
Configuring a Topology Group
To configure a topology group, enter commands such as the following:
FastIron SuperX Router(config)# topology-group 2
FastIron SuperX Router(config-topo-group-2)# master-vlan 2
FastIron SuperX Router(config-topo-group-2)# member-vlan 3
FastIron SuperX Router(config-topo-group-2)# member-vlan 4
FastIron SuperX Router(config-topo-group-2)# member-vlan 5
FastIron SuperX Router(config-topo-group-2)# member-group 2
These commands create topology group 2 and add the following:
• Master VLAN 2
• Member VLANs 2, 3, and 4
• Member VLAN group 2
Syntax: [no] topology-group <group-id>
The <group-id> parameter specifies the topology group ID and can be from 1 – 256.
Syntax: [no] master-vlan <vlan-id>
This command adds the master VLAN. The VLAN must already be configured. Make sure all the Layer 2 protocol
settings in the VLAN are correct for your configuration before you add the VLAN to the topology group. A topology
group can have only one master VLAN.
NOTE: If you remove the master VLAN (by entering no master-vlan <vlan-id>), the software selects the next-
highest numbered member VLAN as the new master VLAN. For example, if you remove master VLAN 2 from the
example above, the CLI converts member VLAN 3 into the new master VLAN. The new master VLAN inherits the
Layer 2 protocol settings of the older master VLAN.
NOTE: If you add a new master VLAN to a topology group that already has a master VLAN, the new master
VLAN replaces the older master VLAN. All member VLANs and VLAN groups follow the Layer 2 protocol settings
of the new master VLAN.
Syntax: [no] member-vlan <vlan-id>
The <vlan-id> parameter specifies a VLAN ID. The VLAN must already be configured.
Syntax: [no] member-group <num>
The <num> specifies a VLAN group ID. The VLAN group must already be configured.
NOTE: Once you add a VLAN or VLAN group as a member of a topology group, all the Layer 2 protocol
configuration information for the VLAN or group is deleted. For example, if STP is configured on a VLAN and you
add the VLAN to a topology group, the STP configuration is removed from the VLAN. Once you add the VLAN to
a topology group, the VLAN uses the Layer 2 protocol settings of the master VLAN.
If you remove a member VLAN or VLAN group from a topology group, you will need to reconfigure the Layer 2
protocol information in the VLAN or VLAN group.
Displaying Topology Group Information
The following sections show how to display STP information and topology group information for VLANS.
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