Spanning-Tree Operation
802.1s Multiple Spanning Tree Protocol (MSTP)
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' later).
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 MSTP Rapid State Transitions” on
page 6-55, 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 Use Global (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 < port-list > hello-
time < 1..10 > (page
6-61). (Default: 2.)
6-60
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