Stp - Supermicro SSE-G48-TG4 Reference Manual

Super Micro Intelligent Switch Command Line Interface User Guide

9 STP

STP (Spanning-Tree Protocol) is a link management protocol that provides path redundancy
while preventing undesirable loops in the network that are created by multiple active paths
between stations. To establish path redundancy, STP creates a tree that spans all of the switches
in an extended network, forcing redundant paths into a standby, or blocked, state.
MSTP defines an extension to RSTP that further develops the usefulness of VLANs. This "per-
VLAN" MSTP configures a separate Spanning Tree for each VLAN group and blocks the links
that are redundant within each Spanning Tree.
If there is only one VLAN in the network, single (traditional) STP works appropriately. If the
network contains more than one VLAN, the logical network configured by single STP would work,
but it is possible to make better use of the redundant links available by using an alternate
spanning tree for different (groups of) VLANs. MSTP allows the formation of MST regions that
can run multiple MST instances (MSTI). Multiple regions and other STP bridges are
interconnected using one single common spanning tree (CST).
The list of CLI commands for the configuration of STP are common to both Single
Instance and Multiple Instance, except for a difference in the prompt that appears for
the Switch with Multiple Instance support.
The prompt for the Global Configuration Mode is,
-
SMIS(config-switch)#
- The prompt for the MSTP Configuration
SMIS(config-switch-mst)#.
The parameters specific to Multiple Instance are stated so, against the respective
parameter descriptions in this document.
The output of the Show commands differ for Single Instance and Multiple Instance.
Hence both the output are documented while depicting the show command examples.
The list of commands to configure STP are:
spanning-tree mode
spanning-tree
spanning-tree compatibility
spanning-tree timers
spanning-tree transmit hold-count
spanning-tree mst max-hops
spanning-tree priority
Release : 1.1f
is,
Mode
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