Cisco Proprietary Rpr Framing Process; Figure 17-3 Cisco Proprietary Rpr Frame For Ml-Series Card - Cisco ONS 15454 SDH Configuration Manual

Chapter 17 Configuring Cisco Proprietary Resilient Packet Ring

Cisco Proprietary RPR Framing Process

Cisco proprietary RPR on the ML-Series card uses a proprietary RPR frame and high-level data link
control (HDLC) or GFP-F framing. It attaches the Cisco proprietary RPR frame header to each Ethernet
frame and encapsulates the Cisco proprietary RPR frame into the SONET/SDH payload for transport
over the SONET/SDH topology. the Cisco proprietary RPR header is removed at the egress ML-Series
card.
Figure 17-3 Cisco Proprietary RPR Frame for ML-Series Card
1 byte 1 byte 1 byte 2 bytes
Flag Add Control Protocol
0x7E 0x0F 0x00 0x0042
The Cisco proprietary RPR framing and header includes a number of fields, including four bytes for
source and destination station information and another four bytes for control and quality of service
(QoS).
important fields.
Figure 17-3 illustrates the Cisco proprietary RPR frame.
4 byte 4 bytes
RPR Address RPR Control
7 byte
Preamble SFD
Figure 17-4 illustrates the Cisco proprietary RPR frame format.
Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0
68-1522 bytes
RPR Payload
60-1514 bytes
Ethernet Payload
1 byte 6 bytes 6 bytes 6 bytes
DA SA Ln/Type
Cisco Proprietary RPR Framing Process
2-4 bytes 1 byte
CRC
46-1500 bytes 4 bytes
Data/Pad FCS
Table 17-1 defines the most
Flag
0x7F
17-5