Cisco Systems ONS 15454

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Cisco ONS 15454 Procedure Guide, R7.0

November 2007

Chapter22 DLPs A500 to A599

DLP- A535 Provision or Modify TARP Operating Parameters

•TARP PDUs Origination—If checked (default), the node performs all TARP origination functions

including:

–

TID to Network Service Access Point (NSAP) resolution requests (originate TARP Type 1 and

Type 2 PDUs)

–

NSAP to TID requests (originate Type 5 PDUs)

–

TARP address changes (originate Type 4 PDUs)

Note TARP Echo and NSAP to TID is not supported.

•TARP Data Cache—If checked (default), the node maintains a TARP data cache (TDC). The TDC

is a database of TID to NSAP pairs created from TARP Type 3 PDUs received by the node and

modified by TARP Type 4 PDUs (TID to NSAP updates or corrections). TARP3 PDUs are

responses to Type 1 and Type 2 PDUs. The TDC can also be populated with static entries entered

on the TARP > Static TDC tab.

Note This parameter is only used when the TARP PDUs Origination parameter is enabled.

•L2 TARP Data Cache—If checked (default), the TIDs and NSAPs of NEs originating Type 2

requests are added to the TDC before the node propagates the requests to other NEs.

The TARP Data Cache parameter is designed for Intermediate System Level1/Level 2 nodes that are

connected to other Intermediate System Level 1/Level 2 nodes. Enabling the parameter for Intermediate

System Level 1 nodes is not recommended.

•LDB—If checked (default), enables the TARP loop detection buffer. The LDB prevents TARP PDUs

from being sent more than once on the same subnet.

The LDP parameter is not used if the Node Routing Mode is provisioned to End System or if the TARP

PDUs L1 Propagation parameter is not enabled.

•LAN TARP Storm Suppression—If checked (default), enables TARP storm suppression. This

function prevents redundant TARP PDUs from being unnecessarily propagated across the LAN

network.

•Send Type 4 PDU on Startup—If checked, a TARP Type 4 PDU is originated during the initial

ONS 15454 startup. Type 4 PDUs indicate that a TID or NSAP change has occurred at the NE. (The

default setting is not enabled.)

•Type 4 PDU Delay—Sets the amount of time that will pass before the Type 4 PDU is generated when

Send Type 4 PDU on Startup is enabled. 60 seconds is the default. The range is 0 to 255 seconds.

Note The Send Type 4 PDU on Startup and Type 4 PDU Delay parameters are not used if TARP

PDUs Origination is not enabled.

•LDB Entry—Sets the TARP loop detection buffer timer. The LDB buffer time is assigned to each

LDB entry for which the TARP sequence number (tar-seq) is zero. The default is 5 minutes. The

range is 1 to 10 minutes.

•LDB Flush—Sets the frequency period for flushing the LDB. The default is 5 minutes. The range is

0 to 1440 minutes.

•T1—Sets the amount of time to wait for a response to a Type 1 PDU. Type 1 PDUs seek a specific

NE TID within an OSI Level 1 area. The default is 15 seconds. The range is 0 to 3600 seconds.