CLI Guide

Layer 2 Switching Commands 460
Ethernet Ring Protection does not support Non-Stop Forwarding. A stack
failover is destructive to the ring, even when configured on stack units that
are not rebooted during the stack failover.
Fault detection depends on the configured CCM transmission period. The
N3000 and N2000 switches support software-based CCM messaging only. All
other switches support hardware-based CCM messaging. Fault detection on
the N2000/N3000 series switches is on the order of seconds. Fault detection
on the other switch models may occur in milliseconds depending on the value
of the CCM transmission period.
Ethernet Ring Protection does not operate in a stack configuration. Do not
configure Ethernet Ring Protection in a stack. Stack failover is not compatible
with Ethernet Ring Protection.
Example
console (config)# ethernet ring g8032 profile profile1
console (config-erp-profile1)#
Command History
Command introduced in firmware release 6.6.1.
timer
This command configures the timer expiry values for an Ethernet ring profile.
Use the no form of the command to reset the timers to the defaults.
Syntax
timer {guard milliseconds | hold-off milliseconds | wtr minutes}
no timer {guard | hold-off | wtr }
• guard timer—The guard timer is used to prevent ring nodes from acting
upon outdated R-APS messages and prevents the possibility of forming a
closed loop. Range: 10ms to 2000 ms in steps of 10ms.
• hold-off timer—When a new defect or more severe defect occurs, this
event will not be reported immediately to protection switching if the
provisioned hold-off timer value is non-zero. Instead, the hold-off timer
will be started. When the hold-off timer expires, it will be checked whether
a defect still exists on the trail that started the timer. If it does, that defect