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Catalyst 2960 Switch SoftwareConfiguration Guide
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Chapter16 Configuring MSTP
Configuring MSTP Features
Configuring the Maximum-Hop Count
Beginning in privileged EXEC mode, follow these steps to configure the maximu m-hop count for all
MST instances. This procedure is optional.
To return the switch to its default setting, use the no spanning-tree mst max-hops global configuration
command.
Specifying the Link Type to Ensure Rapid Transitions
If you connect a port to another port through a point-to-point link and the local port become s a
designated port, the RSTP negotiates a rapid transition with the other port by using the
proposal-agreement handshake to ensure a loop-free topology as describe d in the “Rapid Convergence”
section on page 16-7.
By default, the link type is controlled from the duplex mode of the interface: a full-duplex port is
considered to have a point-to-point connection; a half-duplex port i s considered to have a shared
connection. If you have a half-duplex link physically connected point-to-point to a single port on a
remote switch running MSTP, you can override the default setting of the link type and enable rapid
transitions to the forwarding state.
Beginning in privileged EXEC mode, follow these steps to override the default link-type setting. This
procedure is optional.
To return the port to its default setting, use the no spanning-tree link-type interface configuration
command.
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 spanning-tree mst max-hops hop-count Specify the number of hops in a region before the BPDU is
discarded, and the information held for a port is aged.
For hop-count, the range is 1 to 40; the default is 20.
Step3 end Return to privileged EXEC mode.
Step4 show spanning-tree mst Verify your entries.
Step5 copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 interface interface-id Specify an interface to configure, and enter interface
configuration mode. Valid interfaces include physical ports,
VLANs, and port-channel logical interfaces. The VLAN ID
range is 1 to 4094. The port-channel range is 1 to 6.
Step3 spanning-tree link-type point-to-point Specify that the link type of a port is point-to-point.
Step4 end Return to privileged EXEC mode.
Step5 show spanning-tree mst interface interface-id Verify your entries.
Step6 copy running-config startup-config (Optional) Save your entries in the configuration file.