Tarp Processing, Pdu | Cisco Systems ONS 15600 guide

Chapter 9 Management Network Connectivity

9.7.5 TARP

Table 9-10	TARP PDU Fields (continued)

Field		Abbreviation	Size (bytes)	Description

TID Originator		tar-oln	1	The number of octets that are in the tar-tor field.
Length

Protocol		tar-pln	1	The number of octets that are in the tar-por field.
Address Length

TID of Target		tar-ttg	n = 0, 1, 2...	TID value for the target NE.

TID of		tar-tor	n = 0, 1, 2...	TID value of the TARP PDU originator.
Originator

Protocol		tar-por	n = 0, 1, 2...	Protocol address (for the protocol type identified in the
Address of				tar-pro field) of the TARP PDU originator. When the
Originator				tar-pro field is set to FE (hex), tar-por will contain a
				CLNP address (that is, the NET).

Table 9-11shows the TARP PDUs types that govern TARP interaction and routing.

Table 9-11		TARP PDU Types

Type	Description		Procedure

1	Sent when a device has a TID for which		After an NE originates a TARP Type 1 PDU, the PDU
	it has no matching NSAP.		is sent to all adjacencies within the NE’s routing area.

2	Sent when a device has a TID for which		After an NE originates a TARP Type 2 PDU, the PDU
	it has no matching NSAP and no		is sent to all Level 1 and Level 2 neighbors.
	response was received from the Type 1
	PDU.

3	Sent as a response to Type 1, Type 2, or		After a TARP Request (Type 1 or 2) PDU is received,
	Type 5 PDUs.		a TARP Type 3 PDU is sent to the request originator.
			Type 3 PDUs do not use the TARP propagation
			procedures.

4	Sent as a notification when a change		A Type 4 PDU is a notification of a TID or Protocol
	occurs locally, for example, a TID or		Address change at the NE that originates the
	NSAP change. It might also be sent		notification. The PDU is sent to all adjacencies inside
	when an NE initializes.		and outside the NE’s routing area.

5	Sent when a device needs a TID that		When a Type 5 PDU is sent, the CLNP destination
	corresponds to a specific NSAP.		address is known, so the PDU is sent to only that
			address. Type 5 PDUs do not use the TARP
			propagation procedures.

9.7.5.1 TARP Processing

A TARP data cache (TDC) is created at each NE to facilitate TARP processing. In CTC, the TDC is displayed and managed on the node view Maintenance > OSI > TDC subtab. The TDC subtab contains the following TARP PDU fields:

•TID—TID of the originating NE (tar-tor).

•NSAP—NSAP of the originating NE.

Cisco ONS 15600 Reference Manual, R7.2

9-34

ONS 15600 specifications

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Cisco Systems ONS 15600 manual Tarp Processing, Type Description Procedure, Pdu

Models: ONS 15600

Field

Type

Description

Procedure

PDU.

9.7.5.1 TARP Processing

ONS 15600 specifications