C613-50055-01 REV A Command Reference for x230 Series Edge Switches 375
AlliedWare Plusâ„¢ Operating System - Version 5.4.5-0.x
VLAN COMMANDS
PORT
-VLAN-FORWARDING-PRIORITY
port-vlan-forwarding-priority
Overview Use this command to set the highest priority protocol to control transitions from
blocking to forwarding traffic. This command prioritizes switch port forwarding
mode control, when more than one of EPSR, Loop Protection, and MAC thrashing
protection protocols are used on the switch.
EPSR, Loop Protection and MAC Thrashing use the same mechanism to block or
forward traffic. This command sets the highest priority protocol to control
transitions from blocking to forwarding traffic. Setting the priority stops
contention between protocols.
For example, If EPSR is set to the highest priority protocol to block traffic on vlan10
on port1.0.2 then this stops MAC Thrashing from forwarding traffic on vlan10 on
port1.0.2.
Use the no variant of this command to restore the default highest priority protocol
back to the default of EPSR.
For more information about EPSR, see the EPSR Feature Overview and
Configuration Guide.
Syntax
port-vlan-forwarding-priority {epsr|loop-protection|none}
no port-vlan-forwarding-priority
Default By default, the highest priority protocol is EPSR
Mode Global Configuration
Usage EPSR, Loop Protection and MAC Thrashing protection do not usually need to be
configured on a switch, because they perform similar functions—each prevents
network loops by blocking a selected port for each (loop containing) VLAN.
However, if more than one of these three features is configured on a switch, you
can use this command to prioritize either EPSR or Loop Protection when their
effects on a port would conflict and override each other. Previously, each protocol
Parameter Description
epsr Sets EPSR as the highest priority protocol. Use this parameter on
an EPSR master node to avoid unexpected broadcast storms.
loop-
protection
Sets Loop Protection as the highest priority protocol.
Note that this option must not be set on an EPSR master node.
Use the epsr parameter option on an EPSR master node to avoid
unexpected broadcast storms.
none Sets the protocols to have equal priority. This was the previous
behavior before this command was added, and allows protocols
to override each other to set a port to forwarding a VLAN.
Note that this option must not be set on a EPSR master node.
Use the epsr parameter option on an EPSR master node to avoid
unexpected broadcast storms.
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