Users Guide

Layer 2 Switching Commands 457
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. Fault
detection 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. The N3200 Series switches do not support
hardware-based Connectivity Fault Management. The lowest configurable
value for the Continuity Check Message interval is one thousand
milliseconds. Therefore ERP failover on the N3200 platform is on the order of
multiple seconds.
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upon outdated R-APS messages and prevents the possibility of forming a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