Configures the following MSTP related
parameters for this port channel:
force-version <0-3> – Sets the protocol
version to either STP(0), Not Supported(1),
RSTP(2) or MSTP(3). MSTP is the default
setting
guard
root – Enforces root bridge placement. Setting the
guard to Root ensures the port is a designated
port. Typically, each guard root port is a
designated port, unless two or more ports (within
the root bridge) are connected together.
If the bridge receives superior (BPDUs) on a guard
root-enabled port, the guard root moves the port to a
root-inconsistent STP state. This state is equivalent to
a listening state. No data is forwarded across the port.
Thus, the guard root enforces the root bridge
position.
portfast – Enables fast transitions on this port
channel. When enabled, BPDU filtering and guarding
can be enforced on this port. Enable the portfast
option and then use the ‘bpdufilter‘ and
bpduguard‘ options to configure BPDU filtering and
guarding parameters. This option is disabled by
default.
port-cisco-interoperability [disable|enable] –
Enables or disables interoperability with Cisco's
version of MSTP, which is incompatible with
standard MSTP. This option is disabled by
default.
spanning-tree link-type [point-to-point|shared]
spanning-tree link-type [point-to-point|
shared]
Configures the link type applicable on this port channel. The options are:
point-to-point – Configures a point-to-point link, which indicates the port should be treated as connected to a point-to-point link. Note, a port connected to the wireless device is a point-to-point link. This is the default setting.
shared – Configures a shared link, which indicates this port should be treated as having a shared connection. Note, A port connected to a hub is on a shared link.
Configures the following MST parameters on
this port:
mst
<0-15> – Select the MST instance from 0 -
15.
cost <1-200000000> – Configures the
port cost from 1 - 200000000. The default
path cost depends on the user defined port
speed.The cost helps determine the role of
the port channel in the MSTP network. The
designated cost is the cost for a packet to
travel from this port to the root in the
MSTP configuration. The slower the media,
higher the cost.
port-priority <0-240> – Configures the port
priority from 0 - 240. The lower the priority,
greater is the likelihood of the port becoming a
designated port.
