HP procurve 8100fl series Management And Configuration Manual page 134

Spanning-Tree Operation
Configuring MSTP
9-18
Syntax: spanning-tree max-hops < hop-count >
This command resets the number of hops allowed for BPDUs in an
MST region. When an MSTP switch receives a BPDU, it decrements
the hop-count setting the BPDU carries. If the hop-count reaches zero,
the receiving switch drops the BPDU. Note that the switch does not
change the message-age and maximum-age data carried in the BPDU
as it moves through the MST region and is propagated to other
regions. (Range: 1 - 40; Default: 20)
Syntax: spanning-tree force-version < stp-compatible | rstp-operation | mstp-operation >
Sets the spanning-tree compatibility mode. When the switch is
configured with MSTP mode, this command forces the switch to
emulate behavior of earlier versions of spanning tree protocol or
return to MSTP behavior. The command is useful in test or debug
applications, and removes the need to reconfigure the switch for
temporary changes in spanning-tree operation.
stp-compatible: The switch applies 802.1D STP operation on all ports.
rstp-operation: The switch applies 802.1w operation on all ports except
those ports where it detects a system using 802.1D Spanning Tree.
mstp-operation: The switch applies 802.1s MSTP operation on all ports
where compatibility with 802.1D or 802.1w spanning tree protocols
is not required.
This command is available when the protocol version is set to mstp
(see 'protocol-version' above).
Note that even when mstp-operation is selected, if the switch detects
an 802.1D BPDU or an 802.1w BPDU on a port, it communicates
with the device linked to that port using STP or RSTP BPDU packets.
Also, if errors are encountered as described in the "Note on Path Cost"
on page 9-14, setting force-version to stp-compatible forces the MSTP
switch to communicate out all ports using operations that are
compatible with IEEE 802.1D STP.
Syntax: spanning-tree hello-time < 1..10 >
If MSTP is running and the switch is operating as the CIST root for
your network, this command specifies the time in seconds between
transmissions of BPDUs for all ports on the switch configured with
the Global option. (the default). This parameter applies in MSTP, RSTP
and STP modes. During MSTP operation, you can override this global
setting on a per-port basis with this command:
spanning-tree hello-time < 1..10 > (page 9-19). (Default: 2.)