Spanning-Tree Operation
802.1s Multiple Spanning Tree Protocol (MSTP)
[ mcheck ]
Forces a port to send RSTP BPDUs for 3 seconds. This
allows for another switch connected to the port and
running RSTP to establish its connection quickly and for
identifying switches running 802.1D STP. If the whole-
switch force-version parameter is set to stp-compatible,
the switch ignores the mcheck setting and sends 802.1D
STP BPDUs out all ports. Disable this feature on all ports
that are known to be connected to devices that are running
802.1D STP. (Default: Yes - enabled)
The no spanning-tree < port-list > mcheck ] command disables
mcheck.
Syntax: spanning-tree < port-list > < hello-time | path-cost | point-to-point-mac |
priority >
[ 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 62).
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.)
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