Figure 26-2 Rpr-Ieee Data Frames - Cisco ONS 15454 SDH Configuration Manual

RPR-IEEE Framing Process
Figure 26-2 RPR-IEEE Data Frames
Basic Data Frame
1
TTL to Dest
1 Base Control
6 MAC da
6 MAC sa
1 TTL Base
1 Extended Control
2 hec
2 Protocol Type
n Service Data Unit
4 FCS
Table 26-1
Table 26-1
Field
MAC Destination Address
(MAC da)
MAC Source Address (MAC sa) A fourth-eight-bit field specifying the MAC address of a specific
Base Control
TTL Base
Extended Control
Extended DA
Extended SA
Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0
26-4
Header
Payload
Trailer
defines the most important fields in the RPR-IEEE data frame.
Definitions of RPR-IEEE Frame Fields
Definition
A forty-eight-bit field specifying the destination as a multicast MAC
address or the MAC address of a specific ML-Series card in the
RPR-IEEE.
ML-Series card in the RPR-IEEE as the source.
A field that includes the ring indicator (RI) bit, the fairness eligible
(FE) bit, the frame type (FT) bit, and the service class (SC) bit.
A field that contains the time to live (TTL) setting. The sending station
sets the TTL, which remains unchanged for the life of the packet.
A field that contains the flood indicator (FI) bit and the strict order
(SO) bit.
A forty-eight-bit field specifying the MAC address of the ultimate
destination.
A forty-eight-bit field specifying the MAC address of the ultimate
source.
Chapter 26 Configuring IEEE 802.17b Resilient Packet Ring
Extended Data Frame
1 TTL to Dest
Base Control
1
6 MAC da
6 MAC sa
1 TTL Base
1 Extended Control
2 hec
6 Extended DA
6 Extended SA
2 Protocol Type
n
Service Data Unit
4 FCS
Header
Payload
Trailer