Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 613)

Multi-Service IronWare Switching Configuration Guide 583
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Configuration considerations
17
NOTE
Because free ports are not controlled by the master port’s Layer 2 protocol, they are assumed
always to be in the forwarding state, when enabled.
Configuration considerations
The configuration considerations are as follows:
• You can configure up to 256 topology groups. Each group can control up to 4000 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.
Therefore, you configure the master VLAN and member VLANs or member VLAN groups before
you configure a topology group.
• After you add a VLAN as a member of a topology group, the device deletes all the Layer 2
protocol information on that VLAN.
• 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 a new
candidate master. The new master VLAN inherits the Layer 2 protocol settings of the older
master VLAN.
• After 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. After 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 need to reconfigure
the Layer 2 protocol information in the VLAN or VLAN group.
• On platforms where the Ethernet Service Instance (ESI) framework is supported, master VLANs
in a topology group must either be in the default ESI or within the same ESI. Master and
member VLANs cannot span multiple ESIs.
Configuring a topology group
To configure a topology group, enter commands such as the following.
Brocade(config)# topology-group 2
Brocade(config-topo-group-2)# master-vlan 2
Brocade(config-topo-group-2)# member-vlan 3
Brocade(config-topo-group-2)# member-vlan 4
Brocade(config-topo-group-2)# member-vlan 5
Brocade(config-topo-group-2)# member-group 2