C
HAPTER
16
| STP Commands
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DEFAULT SETTING
None
COMMAND USAGE
◆ Use this command to group VLANs into spanning tree instances. MSTP
generates a unique spanning tree for each instance. This provides
multiple pathways across the network, thereby balancing the traffic
load, preventing wide-scale disruption when a bridge node in a single
instance fails, and allowing for faster convergence of a new topology for
the failed instance.
◆ By default all VLANs are assigned to the Common Internal Spanning
Tree (CIST) that connects all bridges and LANs within the MST region.
This switch supports up to 7 instances. You should try to group VLANs
which cover the same general area of your network. However,
remember that you must configure all bridges within the same MST
Region (page 403) with the same set of instances, and the same
instance (on each bridge) with the same set of VLANs. Also, note that
RSTP treats each MST region as a single node, connecting all regions to
the Common Internal Spanning Tree.
EXAMPLE
STP>msti add 1 2
Add VLAN 2 to MSTI1
STP>
stp port
configuration
This command displays the CIST/MSTI configuration for specified ports.
SYNTAX
stp port configuration [msti] [port-list]
msti - STP bridge instance number. (Range: 0-7, where 0 is the
CIST, and 1-7 are MST instances)
port-list - A specific port or a range of ports. (Range: 1-28, all for
all ports, or 0 for all link aggregation groups)
DEFAULT SETTING
Displays configuration for all ports.
EXAMPLE
STP>msti port configuration 0 1
MSTI Port Path Cost Priority
---- ---- ---------- --------
CIST Aggr Auto 128
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