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

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

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