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150 Summit 300-48 Switch Software User Guide
Spanning Tree Protocol (STP)
config stpd <stpd_name> maxage <value> Specifies the maximum age of a BPDU in this
STPD.
The range is 6 through 40. The default setting is
20 seconds.
Note that the time must be greater than, or equal
to 2 * (Hello Time + 1) and less than, or equal to
2 * (Forward Delay –1).
config stpd <stpd_name> ports cost <value>
<portlist>
Specifies the path cost of the port in this STPD.
The range is 1 through 65,535. The switch
automatically assigns a default path cost based
on the speed of the port, as follows:
• For a 10 Mbps port, the default cost is 100.
• For a 100 Mbps port, the default cost is 19.
config stpd <stpd_name> ports priority
<value> <portlist>
Specifies the priority of the port in this STPD. By
changing the priority of the port, you can make it
more or less likely to become the root port.
The range is 0 through 31. The default setting is
16. A setting of 0 indicates the lowest priority.
config stpd <stpd_name> priority <value> Specifies the priority of the STPD. By changing
the priority of the STPD, you can make it more or
less likely to become the root bridge.
The range is 0 through 65,535. The default
setting is 32,768. A setting of 0 indicates the
highest priority.
create stpd <stpd_name> Creates an STPD. When created, an STPD has
the following default parameters:
• Bridge priority — 32,768
• Hello time — 2 seconds
• Forward delay — 15 seconds
enable ignore-bpdu vlan <name> Configures the switch to ignore STP BPDUs,
which prevents ports in the VLAN from becoming
part of an STPD. This command is useful when
you have a known topology with switches outside
your network, and wish to keep the root bridge
within your network. The default setting is
disabled.
enable ignore-stp vlan <vlan name> Configures the switch to ignore the STP protocol,
and not block traffic for the VLAN(s). This
command is useful when multiple VLANs share
the same physical ports, but only some of the
VLANs require STP protection. The default
setting is disabled.
enable stpd {<stpd_name>} Enables the STP protocol for one or all STPDs.
The default setting is disabled.
enable stpd ports {<portlist>} Enables the STP protocol on one or more ports.
If STPD is enabled for a port, bridge protocol
data units (BPDUs) will be generated on that port
if STP is enabled for the associated STPD. The
default setting is enabled.
Table 53: STP Configuration Commands (continued)
Command Description