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Multiple Instance Spanning-Tree Operation
802.1s Multiple Spanning Tree Protocol (MSTP)
1. Configure the VLANs you want included in any instances in the new
region. When you create the pending region, all VLANs configured on the
switch will be assigned to the pending IST instance unless assigned to
other, pending MST instances.
2. Configure MSTP as the spanning-tree protocol, then execute write mem
and reboot. (The pending option is available only with MSTP enabled.)
3. Configure the pending region name to assign to the switch.
4. Configure the pending config-revision number for the region name.
5. If you want an MST instance other than the IST instance, configure the
instance number and assign the appropriate VLANs (VIDs). (The pending
command creates the region’s IST instance automatically.)
6. Repeat step 5 for each additional MST instance you want to configure.
7. Use the show spanning-tree pending command to review your pending
configuration (page 46).
8. Use the spanning-tree pending apply command to exchange the currently
active MSTP configuration with the pending MSTP configuration.
Syntax: spanning-tree pending
< apply | config-name | config-revision | instance | reset >
apply
Exchanges the currently active MSTP configuration with
the pending MSTP configuration.
config-name
Specifies the pending MST region name. Must be the same
for all MSTP switches in the region. (Default: The switch’s
MAC address.)
config-revision
Specifies the pending MST region configuration revision
number. Must be the same for all MSTP switches in the
region. (Default: 0).
instance < 1..16 > vlan [< vid | vid-range >
Creates the pending instance and assigns one or more
VLANs to the instance.
reset
Copies the switch’s currently active MSTP configuration
to the pending configuration. This is useful when you
want to experiment with the current MSTP configuration
while maintaining an unchanged version.
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