ALM-3276800215 A loop is detected on the L2VPN network connected to the interface

Description

LOOPDETECT/4/DetectLoop: OID [OID] The port detected L2VPN loop. (InterfaceIndex=[INTEGER], InterfaceName=[OCTET], VsiName=[OCTET], LoopPeVlan=[OCTET], LoopCeVlan=[OCTET])

The device detected a loop on the L2VPN network connected to its interface.

Attribute

Alarm ID	Alarm Severity	Alarm Type
3276800215	Warning	environmentalAlarm

Parameters

Name	Meaning
OID	Indicates the MIB object ID of the alarm.
InterfaceIndex	Indicates the interface index.
InterfaceName	Indicates the interface name.
VsiName	Indicates the name of the VSI that is bound to the interface.
LoopPeVlan	Indicates the outer ID of the VLAN in which a loop occurs.
LoopCeVlan	Indicates the inner ID of the VLAN in which a loop occurs.

Impact on the System

After the interface is blocked, all the traffic except protocol packets will be blocked.

Possible Causes

Cause 1: Two interfaces on the CE are connected to the same PE, leading to an L2VPN loop.

Cause 2: One interface on the CE is dual homed to the same VPLS network, leading to an L2VPN loop.

Procedure

Find the VSI name and VLAN IDs related to the L2VPN loop according to the alarm information. Check whether the loop occurs on the L2VPN network to which the interface connects. If so, eliminate the loop.