Chapter 47 Configuration Mode Commands
ES-4124 User’s Guide
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47.3 Enabling STP
Use the spanning-tree or the mrstp commands to enable and configure STP on the
Switch. The difference between the commands is that
spanning-tree only allows you to set
up one spanning tree configuration and the
mrstp command allows you to set up multiple
ones.
Syntax:
spanning-tree
spanning-tree priority <0-61440>
spanning-tree hello-time <1-10> maximum-age <6-40> forward-delay <4-30>
spanning-tree <port-list> path-cost <1-65535>
spanning-tree <port-list> priority <0-255>
and
mrstp <treeIndex> <cr>
mrstp <treeIndex> priority <0-61440>
mrstp <treeIndex> hello-time <1-10> maximum-age <6-40> forward-delay
-> <4-30>
mrstp interface <port-list> <cr>
mrstp interface <port-list> path-cost <1-65535>
mrstp interface <port-list> priority <0-255>
mrstp interface <port-list> treeIndex <1-2>
where
spanning-tree
= Enables STP on the Switch.
mrstp <treeIndex>
Enables a specific tree configuration.
priority <0-61440>
= Specifies the bridge priority for the Switch. The lower the
numeric value you assign, the higher the priority for this bridge.
Bridge priority is used in determining the root switch, root port
and designated port. The switch with the highest priority
(lowest numeric value) becomes the STP root switch. If all
switches have the same priority, the switch with the lowest
MAC address will then become the root switch.
Bridge Priority determines the root bridge, which in turn
determines Hello Time, Max Age and Forwarding Delay.
hello-time <1-10>
= Specifies the time interval in seconds between BPDU (Bridge
Protocol Data Units) configuration message generations by the
root switch.
maximum-age <6-40>
= Specifies the maximum time (in seconds) the Switch can wait
without receiving a BPDU before attempting to reconfigure. All
Switch ports (except for designated ports) should receive
BPDUs at regular intervals. Any port that ages out STP
information (provided in the last BPDU) becomes the
designated port for the attached LAN. If it is a root port, a new
root port is selected from among the Switch ports attached to
the network.
