Default Logging Of Basic State Transitions On Ex Series Switches; Failure Detection; Logical Ring; Fdb Flush - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide

Default Logging of Basic State Transitions on EX Series Switches

Failure Detection

Logical Ring

FDB Flush

114
There can be only one RPL owner for each ring. The user configuration must guarantee
this, because the APS protocol cannot check this.
Starting with Junos OS Release 14.1X53-D15, EX Series switches automatically log basic
state transitions for the ERPS protocol. No configuration is required to initiate this logging.
Basic state transitions include ERPS interface transitions from up to down, and down to
up; and ERPS state transitions from idle to protection, and protection to idle.
The basic state transitions are logged in a single file named
the /var/log directory of the switch. The maximum size of this file is 15 MB.
Default logging for ERPS can capture initial ERPS interface and state transitions, which
can help you troubleshoot issues that occur early in the ERPS protocol startup process.
However, if more robust logging is needed, you can enable traceoptions for ERPS by
entering the statement in the
traceoptions
Be aware that for ERPS, only default logging or traceoptions can be active at a time on
the switch. That is, default logging for ERPS is automatically enabled and if you enable
traceoptions for ERPS, the switch automatically disables default logging. Conversely, if
you disable traceoptions for ERPS, the switch automatically enables default logging.
Ethernet ring operation depends on quick and accurate failure detection. The failure
condition signal failure (SF) is supported. For SF detection, an Ethernet continuity check
MEP must be configured for each ring link. For fast protection switching, a 10-ms
transmission period for this MEP group is supported. OAM monitors the MEP group's MA
and reports SF or SF clear events to the Ethernet ring control module. For this MEP group,
the action profile must be configured to update the interface device IFF_LINKDOWN flag.
OAM updates the IFF_LINKDOWN flag to notify the Ethernet ring control module.
You can define multiple logical-ring instances on the same physical ring. The logical ring
feature currently supports only the physical ring, which means that two adjacent nodes
of a ring must be physically connected and the ring must operate on the physical interface,
not the VLAN. Multiple ring instances are usually defined with trunk mode ring interfaces.
When ring protection switching occurs, normally an FDB flush is executed. The Ethernet
ring control module uses the same mechanism as the STP to trigger the FDB flush. The
Ethernet ring control module controls the ring port physical interface's default STP index
to execute the FDB flush.
Starting with Junos OS Release 14.2, the FDB flush depends on the RAPS messages
received on the both the ports of the ring node.
erp-default
[edit protocols protection-group]
Copyright © 2017, Juniper Networks, Inc.
, which resides in
hierarchy.