Users Guide

Default 20 seconds
Command Mode CONFIGURATION
Usage
Information
None
Example
OS10(config)# spanning-tree rstp max-age 10
Supported
Releases
10.2.0E or later
spanning-tree rstp priority
Sets the priority value for RSTP.
Syntax
spanning-tree rspt priority priority value
Parameters priority priority value — Enter a bridge-priority value in increments of 4096, from 0 to 61440.
Valid priority values are: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960,
45056, 49152, 53248, 57344, and 61440. All other values are rejected.
Default Not configured
Command Mode CONFIGURATION
Usage
Information
RSTP determines the root bridge but you can assign one bridge a lower priority to increase the probability
of it being the root bridge. A lower priority value increases the probability of the bridge becoming a
root bridge.
Example
OS10(config)# spanning-tree rstp priority 5002
Supported
Releases
10.2.0E or later
Multiple Spanning-Tree
MSTP is one of the variations of the rapid spanning-tree protocol that mitigates some of the challenges of Rapid-PVST. Rapid-
PVST allows a spanning-tree instance for each VLAN. This 1:1 approach is not suitable if you have multiple VLANs — each
spanning-tree instance costs bandwidth and processing resources. You can configure Multiple Spanning-Tree Instances (MSTIs)
and map multiple VLANs to one spanning-tree instance to reduce the total number of instances..
When you enable MST, all ports in Layer 2 (L2) mode participate in all instances of MST. OS10 only supports one MST region.
You can achieve load balancing using the MST protocol (MSTP). For example, as shown in the following figure, when you map
three VLANs to two multiple spanning-tree instances (MSTIs), VLAN 100 traffic takes a different path than VLAN 200 and 300
traffic.
Configuring MST is a four-step process:
Layer 2
627