HP ProCurve 2810-24G, Management And Configuration Manual

Page: 124 / 272

5-24
Multiple Instance Spanning-Tree Operation
802.1s Multiple Spanning Tree Protocol (MSTP)
Syntax: [no] spanning-tree < port-list > 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.
The
no spanning-tree < port-list > mcheck
command disables
mcheck.
(Default:
Yes
– mcheck is enabled)
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 5-24).
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 > path-cost < auto | 1..200000000 >
Assigns an individual port cost that the switch uses to
determine which ports are forwarding ports in a given
spanning tree. In the default configuration ( auto ) the
switch determines a port’s path cost by the port’s type:
– 10 Mbps: 2000000
– 100 Mbps: 200000
– 1 Gbps:
20000
Refer to “Note on Path Cost” on page 5-5 for information
on compatibility with devices running 802.1D STP for the
path cost values
(Default: Auto).