Cisco 15327 - Manual (Page 264)

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Ethernet Card Software Feature and Configuration Guide, R7.2
Chapter 17 Configuring Cisco Proprietary Resilient Packet Ring
Configuring Cisco Proprietary RPR Characteristics and the SPR Interface on the ML-Series Card
Step 20 Build the third circuit between POS 0 on Node 3 and POS 1 on Node 1. Use the same procedure
described in Steps
1 through 18 , but substitute Node 3 for Node 1 and Node 1 for Node 2.
Now all of the POS ports in all three nodes are connected by STS point-to-point circuits in an
east-to-west pattern, as shown in
Figure 17-5 on page 17-9 .
Step 21 The CTC circuit process is complete.
Configuring Cisco Proprietary RPR Characteristics and the SPR Interface on the
ML-Series Card
You configure Cisco proprietary RPR on the ML-Series cards by creating an SPR interface using the
Cisco IOS command-line interface (CLI). The SPR interface is a virtual interface for the Cisco
proprietary RPR . An ML-Series card supports a single SPR interface with a single MAC address. It
provides all the normal attributes of a Cisco IOS virtual interface, such as support for default routes.
An SPR interface is configured similarly to a EtherChannel (port-channel) interface. Instead of using the
channel-group command to define the members, you use the spr-intf-id command. Like the
port-channel interface, you configure the virtual SPR interface instead of the physical POS interface. An
SPR interface is considered a trunk port, and like all trunk ports, subinterfaces must be configured for
the SPR interface for it to join a bridge group.
The physical POS interfaces on the ML-Series card are the only members eligible for the SPR interface.
One POS port is associated with the SONET/SDH circuit heading east around the ring from the node,
and the other POS port is associated with the circuit heading west. When the SPR interface is used and
the POS ports are associated, Cisco proprietary RPR encapsulation is used on the SONET/SDH payload.
Caution In configuring an SPR, if one ML-Series card is not configured with an SPR interface, but valid
STS/STM circuits connect this ML-Series card to the other ML-Series cards in the SPR, no traffic will
flow between the properly configured ML-Series cards in the SPR, and no alarms will indicate this
condition. Cisco recommends that you configure all of the ML-Series cards in an SPR before sending traffic.
Caution Do not use native VLANs for carrying traffic with Cisco proprietary RPR.
Note Cisco proprietary RPR on the ML-Series card is only supported with the default LEX encapsulation, a
special CISCO-EOS-LEX encapsulation for use with Cisco ONS Ethernet line cards.