Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 328)

NOTE
You cannot enable Designated Protection and Root Guard on the same port.
Enabling Designated Protection on a port
To disallow the designated forwarding state on a port in STP (802.1d or 802.1w), run the spanning-
tree designated-protect command in interface configuration mode for that port.
The following example shows that the designated forwarding state is disallowed
on Ethernet interface 1/1/1.
Brocade(config)# ethernet interface 1/1/1
Brocade(config-if-e1000-1/1/1)# spanning-tree designated-protect
Syslog message for a port in designated inconsistent state
The following syslog message is generated when a port is put in the designated inconsistent state.
5d19h00m12s:I:STP: VLAN 100 Designated-protect port 2/1/7, inconsistent, Put into
Listening state
Error disable recovery
If a BPDU Guard violation or loop detection violation occurs, or the number of inError packets exceeds
the configured threshold, a port is placed into an error-disabled state, which is functionally equivalent
to a disable state. Once in an error-disabled state, the port remains in that state until it is enabled
either automatically or manually.
Enabling an error-disabled port automatically
To enable a port to recover automatically from the error-disabled state after the expiry of a configured
error recovery timer, run the errdisable recovery cause command in global configuration mode.
For example, to enable error-disable recovery for BPDU guard, enter the following command:
Brocade(config)# errdisable recovery cause bpduguard
Syntax: errdisable recovery cause [ bpduguard | loop-detection | packet-inerror-detect | all ]
Thebpduguard parameter allows the port to recover from the error-disabled state, if the state was
caused by a BPDU guard violation.
The all parameter allows ports to recover from an error-disabled state caused by any reason, for
example, a BPDU guard violation, the number of inError packets exceeding the configured threshold,
or a loop-detection violation.
Enabling Designated Protection on a port
328 FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide
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