Port-Vlan-Forwarding-Priority - Allied Telesis IE220 Series Manual

VLAN C
OMMANDS
- - -
PORT VLAN FORWARDING PRIORITY

port-vlan-forwarding-priority

Overview Use this command to specify which protocol has the highest priority for controlling
transitions from blocking to forwarding traffic, when more than one of EPSR, Loop
Protection, and MAC thrashing protection are used on the switch.
These protocols use the same mechanism to block or forward traffic. This
command specifies either EPSR or Loop Protection as the highest priority protocol.
Setting the priority stops contention between protocols.
For more information, see the Usage section below.
CAUTION
EPSR master node. Use the epsr parameter option on an EPSR master node instead.
Setting this command incorrectly on an EPSR master node could cause unexpected
broadcast storms.
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
Configuration_Guide.
port-vlan-forwarding-priority {epsr|loop-protection|none}
Syntax
no port-vlan-forwarding-priority
Default By default, the highest priority protocol is EPSR
Mode Global Configuration
Usage notes Usually, you only need to configure one of EPSR, Loop Protection and MAC
Thrashing protection 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
C613-50644-01 Rev B
: The loop-protection and none parameter options must not be set on an
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 allows protocols to
override each other to set a port to forwarding for 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.
Command Reference for IE220 Series
AlliedWare Plus™ Operating System - Version 5.5.3-0.x
EPSR Feature Overview and
589