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PowerConnect B-Series FCX Configuration Guide 291
53-1002266-01
802.1s Multiple Spanning Tree Protocol
8
NOTE
Once under MSTP mode, CIST always controls all ports in the system. If you do not want a port to run
MSTP, configure the no spanning-tree command under the specified interface configuration.
Using the [no] option on a system that is configured for MSTP mode changes the system to
non-MSTP mode. When this switch is made, all MSTP instances are deleted together with all MSTP
configurations. ALL VLANs inside the original MSTP scope will not run any Layer-2 protocols after
the switch.
Reduced occurrences of MSTP reconvergence
When a VLAN is deleted, the Dell PowerConnect device retains the associated VLAN to MSTI
mapping instead of deleting it from the configuration. This way, a VLAN can be pre-mapped to an
MSTI and MSTP reconvergence may not be necessary when a VLAN is added to or deleted from the
configuration. As long as the VLAN being created or deleted is pre-mapped to an MSTI, and the
VLAN to MSTI mapping has not changed, MSTP reconvergence will not occur.
NOTE
MSTP reconvergence occurs when the VLAN to MSTI mapping is changed using the mstp instance
command.
You can optionally remove VLAN to MSTI mappings from the configuration. Refer to “Deleting a
VLAN to MSTI mapping” on page 292.
The following shows an example application.
Example application
The following example shows the running configuration file before and after deleting a VLAN from
the configuration. The VLAN to MSTI mapping is retained in the running configuration, even after
the VLAN is deleted.