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3-45

Multiple Instance Spanning-Tree Operation

Configuring MSTP

All switches in a region must be configured with the same VLAN ID-to-

MSTI mappings and the same MSTP configuration identifiers (region

name and revision number).

■ Flexibility: By preconfiguring identical VLAN ID-to-MSTI mappings on all

switches in an MST region, you can combine switches that support

different maximum numbers of VLANs.

■ Network stability: You can reduce the interruptions in network connec-

tivity caused by the regeneration of spanning trees in the entire network

each time a configuration change in VLAN-to-MSTI mapping is detected

on a switch. The negative impact on network performance is reduced if

all newly created VLANs are pre-mapped to the correct MST instances.

Later, VLAN creation and deletion are ignored by MSTP and no interrup-

tion in spanning-tree traffic occurs.

■ Usability: Dynamically learned GVRP VLANs can be mapped to MSTIs and

support MSTP load balancing.

PreConfiguring VLANs in an MST Instance

When you configure an MSTP regional topology, you create multiple spanning-

tree instances. Each MST instance provides a fully connected active topology

for a particular set of VLANs.

Each switch in an MSTP region is configured with the following set of common

parameters:

■ Region name (spanning-tree config-name)

■ Region revision number (spanning-tree config-revision)

■ Identical VLAN ID-to-MSTI mapping (spanning-tree instance vlan)

Each MST instance supports a different set of VLANs. A VLAN that is mapped

to an MST instance cannot be a member of another MST instance.

The MSTP VLAN configuration enhancement allows you to ensure that the

same VLAN ID-to-MSTI assignments exist on each MSTP switch in a region.

Before a static VLAN is configured or a dynamic VLAN is learned on the switch,

you can used the spanning-tree instance vlan command to map VLANs to each

MST instance in the region. Later, when the VLAN is created, the switch

automatically assigns it to the MST instance to which you had previously

mapped it.

Brand

Model

ProCurve 5412ZL

HP ProCurve 5412ZL User Manual

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