Configure Multiple Spanning Tree Protocol
Use the following procedure to configure the Multiple Spanning Tree Protocol.
Procedure
Example
Configure Multiple Spanning Tree Protocol to configure the MSTP configuration version.
Switch:1(config)# spanning-tree mstp forward-time 500 max-age 3000 max-hop 200 pathcost-type bits32 priority 8192 tx-holdcount 10 version mstp
Variable Definitions
Use the data in the following table to use the spanning-tree mstp command.
Variable |
Value |
---|---|
forward-time <400-3000> |
Configures the MSTP forward delay for the bridge from 400 to 3000 hundredths of a second. |
max-age <600-4000> |
Assigns the MSTP maximum age time for the bridge from 600 to 4000 one hundredths of a second. |
max-hop <100-4000> |
Assigns the MSTP bridge maximum hop count. The range is 100 to 4000 one hundredths of a second. The original MIB erroneously designated the value in hundredths of a second, when it should have been in hops. The replacement MIB kept the range at 100-4000 to remain backwards compatible. To convert this value to hops, divide by 100 so 100-4000 equals 1-40 hops. |
msti <1-63> priority <0–65535> |
Assigns the MSTP MSTI instance parameter. |
pathcost-type {bits16|bits32} |
Assigns the MSTP default pathcost type to either 16 bits or 32 bits. The default is 32 bits. |
priority <0-61440> |
Assigns the MSTP bridge priority in a range of 0 to 61440 in steps of 4096. |
region [config-id-sel <0-255>] [region-name <WORD 1-32>] [region-version <0-65535>] |
Assigns the MSTP region commands:
|
tx-holdcount <1-10> |
Assigns the MSTP transmit hold count. The range is 1 to 10.The default value is 3. |
version {mstp|rstp|stp-compatible} |
Assigns the bridge version. Although STP and MSTP are variations of the same spanning tree protocol, they communicate information differently. A switch in MSTI mode cannot recognize the spanning tree groups running on a chassis configured with STP. MSTP spanning tree groups are not the same as STP spanning tree groups. Using a switch in MSTP mode with another chassis in STP mode can create a loop in the network. You must configure protocol migration to true on all spanning-tree enabled interfaces when you change the spanning tree version from STP-compatible to MSTP for those interfaces to work in the proper mode. Note:
You cannot configure the MSTP version when MSTP-Fabric Connect Multi Homing is enabled on the switch. |