Specifying The Link Type To Ensure Rapid Transitions - Cisco 3845 - Security Bundle Router Software Manual
Software configuration guide
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Chapter 14
Configuring MSTP
Command
Step 1
configure terminal
Step 2
spanning-tree mst max-hops hop-count
Step 3
end
Step 4
show spanning-tree mst
Step 5
copy running-config startup-config
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 an STP port to another STP port through a point-to-point link and the local port becomes
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 described in the
section on page
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 is 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.
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
spanning-tree link-type point-to-point
Step 4
end
Step 5
show spanning-tree mst interface interface-id
Step 6
copy running-config startup-config
To return the port to its default setting, use the no spanning-tree link-type interface configuration
command.
OL-23400-01
Purpose
Enter global configuration mode.
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 255; the default is 20.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
14-9.
Purpose
Enter global configuration mode.
Specify an interface to configure, and enter interface
configuration mode. Valid interfaces include physical
interfaces, VLANs, and port channels. The VLAN ID range is 1
to 4094. The port-channel range is 1 to 26.
Note
Specify that the link type of a port is point-to-point.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
If the interface is a VLAN, only ports with spanning tree
enabled in the VLAN will run spanning tree.
Configuring MSTP Features
"Rapid Convergence"
14-25
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