Brocade Network Advisor IP User Manual v12.3.0 - Manual (Page 1022)

970 Brocade Network Advisor IP User Manual
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VLAN routing
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Assigning an MSTP instance to a VLAN
NOTE
For Network OS products in standalone mode, you can configure from 1 through 31 MSTP instances
and for Fabric OS DCB switches, you can configure from 1 through 15 MSTP instances; for the Fabric
OS converged 10 GbE switch module for the IBM BladeCenter, you can configure from 1 through 31
MSTP instances.
1. Click the STP button on the VLAN Manager dialog box to display the STP Configuration dialog
box.
2. Select a VLAN node (in this example, a FOS node) in the Selected VLANs list, and click the left
arrow button.
The target is automatically set to FOS VLAN in the Target Context list.
3. Select MSTP from the Spanning Tree list.
The STP Configuration dialog box displays the Available MSTP Instances list.
4. Select one instance from the Available MSTP Instances list and, using the right arrow button,
assign it to a VLAN in the Selected VLANs list.
Adding an MSTP instance
1. Click the STP button on the VLAN Manager dialog box to display the STP Configuration dialog
box.
2. Select a VLAN node (in this example, a FOS node) in the Selected VLANs list, and click the left
arrow button.
The target is automatically set to FOS VLAN in the Target Context list.
3. Select MSTP from the Spanning Tree list.
The STP Configuration dialog box displays the Available MSTP Instances list.
4. Select an MSTP instance from the list under the Available MSTP Instances list, or enter the
MSTP instance number.
5. Click Add.
A new row is added to the Available MSTP Instances list. You can change the bridge priority,
which is set, by default, to 32768.
VLAN routing
A VLAN restricts the broadcast domain to only its interface members. If nodes connected to two
different VLANs want to communicate, they require an external router to route between the VLANs.
Optionally, DCB products offer the ability to create a Switch Virtual Interface (SVI) to route between
VLANs.
An SVI is a VLAN of switch ports represented by one interface to a routing or bridging system. There
is no physical interface for the VLAN and the SVI provides the Layer 3 processing for packets from
all switch ports associated with the VLAN. There is one-to-one mapping between a VLAN and an
SVI; therefore, only a single SVI can be mapped to a VLAN. The VLAN is mapped to a network
address using the SVI. All the nodes in the VLAN will belong to the subnet of the SVI.