Cisco ONS 15454 DWDM Installation And Operation Manual page 537

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Chapter 10
Manage the Node
Note
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.
Note
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.
Note
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
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.
T2—Sets the amount of time to wait for a response to a Type 2 PDU. TARP Type 2 PDUs seek a
specific NE TID value within OSI Level 1 and Level 2 areas. The default is 25 seconds. The range
is 0 to 3600 seconds.
T3—Sets the amount of time to wait for an address resolution request. The default is 40 seconds.
The range is 0 to 3600 seconds.
T4—Sets the amount of time to wait for an error recovery. This timer begins after the T2 timer
expires without finding the requested NE TID. The default is 20 seconds. The range is
0 to 3600 seconds.
Note
September 2005
This parameter is only used when the TARP PDUs Origination parameter is enabled.
The L2 TARP Data Cache parameter is designed for Intermediate System Level 1/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.
The LDB 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.
The Send Type 4 PDU on Startup and Type 4 PDU Delay parameters are not used if the
TARP PDUs Origination parameter is not enabled.
The T1, T2, and T4 timers are not used if TARP PDUs Origination is not enabled.
DLP-G284 Modify the TARP Operating Parameters
Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
10-11

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