Cisco Systems 15327 Assigning the ML-Series Card POS Ports to the SPR Interface

17-14
Ethernet Card Software Feature and Configuration Guide, R7.2
January 2009
Chapter 17 Configuring Cisco Proprietary Resilient Packet Ring
Assigning the ML-Series Card POS Ports to the SPR Interface
Assigning the ML-Series Card POS Ports to the SPR Interface
Caution The SPR interface is the routed interface. Do not ena ble Layer 3 addresses or assign bridge groups on
the POS interfaces assigned to the SPR interface.
Caution When traffic coming in on an SPR interface needs to be policed, the same input service policy needs to
be applied to both POS ports that are part of the SPR interface.
The POS ports require LEX encapsulation to be used in Cisco pr oprietary RPR. The first step of
configuration is to set the encapsulation of POS 0 and POS 1 ports to LEX.
Each of the ML-Series card’s two POS ports must also be assigned to the SPR interface. To configure
LEX encapsulation and assign the POS interfaces on the ML-Series card to the SPR, perform the
following procedure, beginning in global configuration mode:
Command Purpose
Step 1 Router(config)# interface pos 0 Enters the interface configuration mode to configure the
first POS interface that you want to assign to the SPR.
Step 2 Router(config-if)# encapsulation lex Sets POS interface encapsulation as LEX (default).
Cisco proprietary RPR on the ML-Series card requires
LEX encapsulation.
Step 3 ( Router(config-if)# spr-intf-id
shared-packet-ring-number
Assigns the POS interface to the SPR interface. The
shared packet ring number must be 1, which is the only
shared packet ring number that you can assign to the SPR
interface.
Step 4 Router(config-if)# carrier-delay msec
milliseconds
(Optional) Sets the carrier delay time. The default setting
is 200 msec, which is optimum for SONET/SDH
protected circuits.
Note The default unit of time for setting the carrier
delay is seconds. The msec command resets the
time unit to milliseconds.
Step 5 Router(config-if)# pos trigger defect
ber_sd-b3
(Optional) Configures a trigger to bring down the POS
interface when the SONET/SDH bit error rate exceeds
the threshold set for the signal degrade alarm. Bringing
the POS interface down initiates the Cisco proprietary
RPR wrap.
This command is recommended for all Cisco proprietary
RPR POS interfaces, since excessive SONET/SDH bit
errors can cause packet loss on Cisco proprietary RPR
traffic.
Note This command should not be used when a
Cisco ONS 15310 is part of the ring. It might
cause inconsistent Cisco proprietary RPR
wrapping.
Step 6 Router(config-if)# no shutdown Enables the POS port.