Tarp Processing; Table 9-9 Tarp Pdu Fields; Table 9-10 Tarp Pdu Types - Cisco ONS 15600 Reference Manual

Chapter 9 Management Network Connectivity
Table 9-9
Field
TID Originator
Length
Protocol
Address Length
TID of Target
TID of
Originator
Protocol
Address of
Originator
Table 9-10
Table 9-10
Type
1
2
3
4
5

9.6.5.1 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:
•
•
TARP PDU Fields (continued)
Abbreviation Size (bytes) Description
tar-oln
tar-pln
tar-ttg
tar-tor
tar-por
shows the TARP PDUs types that govern TARP interaction and routing.
TARP PDU Types
Description
Sent when a device has a TID for which
it has no matching NSAP.
Sent when a device has a TID for which
it has no matching NSAP and no
response was received from the Type 1
PDU.
Sent as a response to Type 1, Type 2, or
Type 5 PDUs.
Sent as a notification when a change
occurs locally, for example, a TID or
NSAP change. It might also be sent
when an NE initializes.
Sent when a device needs a TID that
corresponds to a specific NSAP.
TID—TID of the originating NE (tar-tor).
NSAP—NSAP of the originating NE.
1 The number of octets that are in the tar-tor field.
1 The number of octets that are in the tar-por field.
n = 0, 1, 2... TID value for the target NE.
n = 0, 1, 2... TID value of the TARP PDU originator.
n = 0, 1, 2... Protocol address (for the protocol type identified in the
tar-pro field) of the TARP PDU originator. When the
tar-pro field is set to FE (hex), tar-por will contain a
CLNP address (that is, the NET).
Procedure
After an NE originates a TARP Type 1 PDU, the PDU
is sent to all adjacencies within the NE's routing area.
After an NE originates a TARP Type 2 PDU, the PDU
is sent to all Level 1 and Level 2 neighbors.
After a TARP Request (Type 1 or 2) PDU is received,
a TARP Type 3 PDU is sent to the request originator.
Type 3 PDUs do not use the TARP propagation
procedures.
A Type 4 PDU is a notification of a TID or Protocol
Address change at the NE that originates the
notification. The PDU is sent to all adjacencies inside
and outside the NE's routing area.
When a Type 5 PDU is sent, the CLNP destination
address is known, so the PDU is sent to only that
address. Type 5 PDUs do not use the TARP
propagation procedures.
Cisco ONS 15600 Reference Manual, R8.0
9.6.5 TARP
9-33