Framing Mode, Encapsulation, And Crc Support; Configuring Pos Interface Framing Mode; Configuring Pos Interface Encapsulation Type - Cisco ONS 15454 SDH Configuration Manual

Framing Mode, Encapsulation, and CRC Support

Framing Mode, Encapsulation, and CRC Support
The ML-Series cards on the ONS 15454 and ONS 15454 SDH support two modes of the POS framing
mechanism, GFP-F framing and HDLC framing (default). The framing mode, encapsulation, and CRC
size on source and destination POS ports must match for a POS circuit to function properly.
"POS on ONS Ethernet Cards,"
redundancy check (CRC) bit sizes in detail.
Supported encapsulation and CRC sizes for the framing types are detailed in
Table 5-3
ML-Series
ML-Series card POS interfaces normally send PDI-P to the far-end when the POS link goes down or RPR
Note
wraps. ML-Series card POS interfaces do not send PDI-P to the far-end when PDI-P is detected, when
RDI-P is being sent to the far-end or when the only defects detected are GFP LFD, GFP CSF, VCAT
LOM or VCAT SQM.

Configuring POS Interface Framing Mode

You configure framing mode on an ML-Series card only through CTC. For more information on
configuring framing mode in CTC, see

Configuring POS Interface Encapsulation Type

The default Cisco EoS LEX is the primary encapsulation of ONS Ethernet cards. This encapsulation is
used under HDLC framing with the protocol field set to the values specified in Internet Engineering Task
Force (IETF) Request For Comments (RFC) 1841. Under GFP-F framing, the Cisco IOS CLI also uses
the keyword lex. With GFP-F framing, the lex keyword is used to represent standard mapped Ethernet
over GFP-F according to ITU-T G.7041.
To configure the encapsulation type for a ML-Series card, perform the following steps beginning in
global configuration mode:
Command
Step 1
Router(config)# interface pos number
Step 2
Router(config-if)# shutdown
Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0
5-4
explains the framing mechanisms, encapsulations, and cyclic
Supported Encapsulation, Framing, and CRC Sizes for ML-Series Cards on the
ONS 15454 and ONS 15454 SDH
Encapsulations for CRC Sizes for HDLC
HDLC Framing Framing
LEX (default) 16-bit
Cisco HDLC 32-bit (default)
PPP/BCP
Encapsulations for
GFP-F Framing
LEX (default)
Cisco HDLC
PPP/BCP
Chapter 2, "CTC Operations."
Purpose
Activates interface configuration mode to
configure the POS interface.
Manually shuts down the interface. Encapsulation
changes on POS ports are allowed only when the
interface is shut down (ADMIN_DOWN).
Chapter 5 Configuring POS
Chapter 20,
Table 5-3.
CRC Sizes for
GFP-F Framing
32-bit (default)