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C-6

Cisco 6400 Software Setup Guide

OL-1183-04

AppendixC Optimizing the Number of Virtual Connections on the Cisco 6400

Guidelines for Maximizing the Number of Virtual Connections

Shrinking ITT Blocks

Once an ITT block expands, it does not automatically shrink if the block becomes larger than necessary

for the ATM port and VPI combination. The unused portion of the block, especially when adjacent to an

unused fragment of ITT memory, can instead be used to create another ITT block.

Note This functionality is available in Cisco IOS Release 12.1(4)DB and later releases.

To enable ITT blocks to shrink in place when they are larger than necessary for the current virtual

connections, use the following command in global configuration mode:

Note Enable block shrinking only when you actively remove virtual connections or high VCI values. Block

shrinking significantly increases processor and memory resource usage, and can affect system

performance.

Example

In the following example, block shrinking is enabled while PVCs with high VCIs are deleted. Then block

shrinking is disabled to prevent draining processor and memory resources.

Switch(config)# atm input-xlate-table autoshrink

Switch(config)# interface atm 1/0/0

Switch(config-if)# no atm pvc 0 1010

Switch(config-if)# no atm pvc 0 1011

Switch(config-if)# exit

Switch(config)# no atm input-xlate-table autoshrink

Verifying ITT Block Shrinking

To verify ITT block shrinking, use the show atm input-xlate-table inuse EXEC command in

combination with the show atm vc interface atm slot/subslot/port EXEC command. The displayed size

of the blocks in use should be just large enough to accommodate the displayed VCIs.

Displaying ITT Allocation

To display ITT allocation, use the following command in EXEC mode:

Command Purpose

Switch(config)# atm input-xlate-table autoshrink

Enables ITT blocks to shrink in place when they are larger than

necessary to accommodate the configured virtual connections.

Command Purpose

Switch> show atm input-xlate-table [inuse]

Displays ITT allocation, including both used and unused ITT memory.

Optionally, with the inuse keyword, displays only the allocated ITT

blocks and the ATM interfaces and VPI values associated with each

block.

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