Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 71)

Topology group configuration considerations
• You must configure the master VLAN and member VLANs or member VLAN groups before you
configure the topology group.
• You can configure up to 30 (256 for ICX 6650) topology groups. Each group can control up to 4096
VLANs. A VLAN cannot be controlled by more than one topology group.
• The topology group must contain a master VLAN and can also contain individual member VLANs,
VLAN groups, or a combination of individual member VLANs and VLAN groups.
• 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.
• If you remove the master VLAN (by entering no master-vlan vlan-id ), the software selects the new
master VLAN from member VLANs. A new candidate master VLAN will be in configured order to a
member VLAN so that the first added member VLAN will be a new candidate master VLAN. Once
you save and reload, a member-vlan with the youngest VLAN ID will be the new candidate master.
The new master VLAN inherits the Layer 2 protocol settings of the older master VLAN.
• Once you add a VLAN as a member of a topology group, all the Layer 2 protocol information on the
VLAN is deleted.
Configuring a topology group
To configure a topology group, enter commands such as the following.
device(config)#topology-group 2
device(config-topo-group-2)#master-vlan 2
device(config-topo-group-2)#member-vlan 3
device(config-topo-group-2)#member-vlan 4
device(config-topo-group-2)#member-vlan 5
device(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
When removing the master VLAN from the topology group, spanning tree is disabled on the master
VLAN.
NOTE
If you remove the master VLAN (by entering no master-vlan vlan-id ), the software selects the new
master VLAN from member VLANs. 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.
Topology group configuration considerations
FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide 71
53-1003086-04