Configuration Guide User guide

FastIron Configuration Guide 1155
53-1002494-02
STP feature configuration
Syntax: [no] master-vlan <num>
This command adds a master VLAN to the STP group. The master VLAN contains the STP
settings for all the VLANs in the STP per VLAN group. The <num> parameter specifies the
VLAN ID. An STP group can contain one master VLAN.
If you delete the master VLAN from an STP group, the software automatically assigns the first
member VLAN in the group to be the new master VLAN for the group.
Syntax: [no] member-vlan <num> [to <num>]
This command adds additional VLANs to the STP group. These VLANs also inherit the STP
settings of the master VLAN in the group.
Syntax: [no] member-group <num>
This command adds a member group (a VLAN group) to the STP group. All the VLANs in the
member group inherit the STP settings of the master VLAN in the group. The <num>
parameter specifies the VLAN group ID.
NOTE
This command is optional and is not used in the example above. For an example of this
command, refer to “Configuration example for STP load sharing”.
Configuration example for STP load sharing
Figure 152 shows another example of a STP per VLAN group implementation.
FIGURE 152 More complex STP per VLAN group example
In this example, each of the devices in the core is configured with a common set of master VLANs,
each of which contains one or more member VLANs. Each of the member VLANs in an STP group
runs the same instance of STP and uses the STP parameters configured for the master VLAN.
Member VLANs
2 - 200
Member VLANs
202 - 400
Member VLANs
402 - 600
Member VLANs
3802 - 4000
Root bridge
for master VLAN 1
Root bridge
for master VLAN 201
Root bridge
for master VLAN 401
Root bridge
for master VLAN 3801
FWD 1
FWD 1
FWD 1
BLK 1
BLK 1
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