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4-27
Multiple Instance Spanning-Tree Operation
Configuring MSTP
Syntax: [no] spanning-tree < port-list > auto-edge-port
Supports the automatic identification of edge ports. The
port will look for BPDUs for 3 seconds; if there are none it
begins forwarding packets. If admin-edge-port is enabled
for a port, the setting for auto-edge-port is ignored whether
set to yes or no. If admin-edge-port is set to No, and auto-
edge-port has not been disabled (set to No), then the auto-
edge-port setting controls the behavior of the port. (Default:
Yes - enabled)
The no spanning-tree < port-list > auto-edge-port command
disables auto-edge-port operation on the specified ports.
Syntax: spanning-tree < port-list > hello-time < global | 1 - 10 >
When the switch is the CIST root, this parameter specifies
the interval (in seconds) between periodic BPDU
transmissions by the designated ports. This interval also
applies to all ports in all switches downstream from each
port in the < port-list >. A setting of global indicates that the
ports in < port-list > on the CIST root are using the value set
by the global spanning-tree hello-time value (page 4-23).
When a given switch “X” is not the CIST root, the per-port
hello-time for all active ports on switch “X” is propagated
from the CIST root, and is the same as the hello-time in use
on the CIST root port in the currently active path from
switch “X” to the CIST root. (That is, when switch “X” is
not the CIST root, then the upstream CIST root’s port hello-
time setting overrides the hello-time setting configured on
switch “X”).
(Default Per-Port setting: Use Global.
Default Global Hello-Time: 2.)
Syntax: spanning-tree < port-list > mcheck
Forces a port to send RST/MST BPDUs for 3 seconds. This
tests whether all STP bridges on the attached LAN have been
removed and the port can migrate to native MSTP mode
and use RST/MST BPDUs for transmission.