Spanning-Tree Operation
802.1s Multiple Spanning Tree Protocol (MSTP)
– Force-Version operation
spanning-tree force-version
– Forward Delay
spanning-tree forward-delay
– Hello Time (used if the switch operates as the root device.)
spanning-tree hello-time
– Maximum age to allow for STP packets before discarding
spanning-tree max-age
– Device spanning-tree priority. Specifies the priority value used
along with the switch MAC address to determine which device is
root. The lower a priority value, the higher the priority.
spanning-tree priority
3. Configure MST instances.
• Configure one instance for each VLAN group that you want to operate
as an active topology within the region to which the switch belongs.
When you create the instance, you must include a minimum of one
VID. You can add more VIDs later if desired.
spanning-tree instance < 1 - 16 > vlan < vid >
To move a VLAN from one instance to another, first use no spanning-
tree instance < n > vlan < vid > to unmap the VLAN from the current
instance, then add the VLAN to the other instance. (While the VLAN
is unmapped from an MSTI, it is associated with the region’s IST
instance.)
4. Configure the priority for each instance.
spanning-tree instance <n> priority <n>
5. Configure MST instance port parameters. Enable edge-port for ports
connected to end nodes (page 63), but leave it disabled (the default) for
connections to another switch, a bridge, or a hub. Set the path cost value
for the port(s) used by a specific MST instance. Leaving this setting at the
default auto allows the switch to calculate the path-cost from the link
speed.
spanning-tree instance < 1 - 16 | ist > port-list < port-list >
6. Enable spanning-tree operation on the switch.
spanning-tree
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