26-14
Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0
Chapter 26 Configuring IEEE 802.17b Resilient Packet Ring
Configuring a Span Shutdown
Configuring a Span Shutdown
The rpr-ieee shutdown command performs the same task as the rpr-ieee protection request
forced-switch command.
To cause a forced switch on the span of the interface, perform the following procedure, beginning in
global configuration mode:
Configuring Keepalive Events
A station receives fairness messages from a link to determine its status. When the number of
milliseconds that pass without receiving a fairness message from the neighboring stations exceeds a
specified timer, a keepalive event is triggered. The keepalive event generates a protection event.
The timer can have a different value on each span and must be greater than or equal to the hold-off timer.
This feature is independent of the fairness algorithm itself, but is still a function performed by the
fairness machine.
To enable and configure the keepalives, perform the following procedure, beginning in global
configuration mode:
Command Purpose
Step 1
Router(config)# interface rpr-ieee 0
Activates interface configuration mode to
configure the RPR-IEEE interface.
Step 2
Router(config-if)# rpr-ieee shutdown {east
| west}
Causes a forced switch on a specified span of the
interface.
Step 3
Router(config)# end
Returns to privileged EXEC mode.
Step 4
Router# copy running-config startup-config
(Optional) Saves configuration changes to the
TCC2/TCC2P flash database.
Command Purpose
Step 1
Router(config)# interface rpr-ieee 0
Activates interface configuration mode to
configure the RPR-IEEE interface.
Step 2
Router(config-if)# rpr-ieee keepalive-timer
milliseconds
[east | west]
Specifies the amount of time that can pass before
a keepalive event is triggered after not receiving a
fairness message from a neighboring station.
Values range from 2 to 200 milliseconds. The
default is 3 milliseconds.
(Optional) You can also specify the east or west
ringlet.
Caution
The number of milliseconds for the
keepalive timer must be higher than the
number of milliseconds for the holdoff
timer.
Step 3
Router(config)# no shut
Enables the RPR-IEEE interface and changes the
mode from the default passthrough.
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