Table of Contents

T Commands

tag-switching atm allocation-mode

To control the mode used for handling tag binding requests on TC ATM interfaces, use the tag-switching atm allocation-mode global configuration command. To set the allocation mode to its default, use the no form of this command.

tag-switching atm allocation-mode {optimistic | conservative}
no tag-switching atm allocation-mode {optimistic | conservative}

Syntax Description

Default

Conservative

Command Mode

Global configuration

Example

The following example sets the mode for handling binding requests to optimistic on TC ATM interfaces.

tag-switching atm control-vc

To configure the VPI/VCI to be used for the initial link to the tag switching peer, use the tag-switching atm control-vc interface configuration command. This control VC is used to establish the TDP session and carry non-IP traffic. To set the control VPI/VCI to the default, use the no form of this command.

tag-switching atm control-vc vpi vci
no tag-switching atm control-vc vpi vci

Syntax Description

Default

0/32

Command Mode

Interface configuration

Usage Guidelines

On a VP tunnel, the default VPI is the tunnel number and the default VCI is 32.

Example

The following example shows how to select VPI 1 and VCI 34 as the control VC.

Related Command

tag-switching ip (interface)

tag-switching atm vc-merge

To control whether VC-merge (multipoint-to-point VCs) is supported for unicast tag VCs, use the tag-switching atm vc-merge global configuration command. To disable this feature, use the no form of this command.

tag-switching atm vc-merge
no tag-switching atm vc-merge

Syntax Description

This command has no keywords or arguments.

Default

Enabled.

Command Mode

Global configuration

Example

Since the default mode is to enable VC merge, it is not necessary to issue the tag-switching atm vc-merge command. However to disable VC merge, you must enter the no form of the command.

Related Commands

show tag-switching atm-tdp bindings
show tag-switching atm-tdp capability

tag-switching atm vpi

To configure the range of values to use in the VPI field for tag VCs, use the tag-switching atm vpi interface configuration command. To clear the interface configuration, use the no form of this command.

tag-switching atm vpi vpi [- vpi]
no tag-switching atm vpi vpi [- vpi]

Syntax Description

Default

1 - 1

Command Mode

Interface configuration

Usage Guidelines

The value will be negotiated with its peer.

You cannot enter a VPI range on a VP tunnel; the VPI is the PVP number of the tunnel.

If the TDP neighbor is a router, the VPI range cannot be larger than 2; for example, from 5 to 6 (a range of 2), not 5 to 7 (a range of 3).

Example

The following example shows you how to select a VPI range from 5 to 6.

tag-switching ip (global)

To allow tag switching of IPv4 packets, use the tag-switching ip global configuration command. To disable IP tag switching across all interfaces, use the no form of this command.

tag-switching ip
no tag-switching ip

Syntax Description

This command has no keywords or arguments.

Default

Enabled

Command Mode

Global configuration

Usage Guidelines

Dynamic tag switching (that is, the distribution of tags based on routing protocols) is allowed by this optional command, but is not actually enabled until the interface-level tag-switching ip command is issued on at least one interface. The no form of this command stops the distribution of dynamic tags and the sending of outgoing tagged packets on all interfaces. The sending of tagged packets on TSP tunnels is not affected by this command.

For TC ATM, the no form of this command prevents tag VCs beginning at, terminating at, or passing through the platform.

Example

The following example shows how to enable the distribution of dynamic tags on all interfaces.

Related Command

tag-switching ip (interface)

tag-switching ip (interface)

To enable tag switching of IPv4 packets on an interface, use the tag-switching ip interface configuration command. To disable IP tag switching on an interface, use the no form of this command.

tag-switching ip
no tag-switching ip

Syntax Description

This command has no keywords or arguments.

Default

Disabled

Command Mode

Interface configuration

Usage Guidelines

The first time this command is issued on any interface, dynamic tag switching is enabled on the entire switch. TDP Hellos are issued on this interface. When an outgoing tag for a destination routed out through this interface is received, packets sent to that destination are tagged as outgoing.

The no form of this command causes packets routed out through this interface to be sent as untagged, and outgoing TDP Hellos are no longer sent.

When the no form is issued on the only interface for which tag switching is enabled, dynamic tag switching is disabled on the entire switch.

For TC ATM, the no form of this command prevents tag VCs beginning at, terminating at, or passing through the this interface.

Example

In the following example, tag switching is enabled on ATM interface 1/1/0.

Related Commands

tag-switching atm allocation-mode
tag-switching ip (global)

tag-switching tdp discovery

To configure the interval between transmission of TDP discovery Hello messages and the hold time for a TDP transport connection, use the tag-switching tdp discovery global configuration command. To set the interval and hold time to their defaults, use the no form of this command.

tag-switching tdp discovery {hello | directed-hello} {holdtime | interval} seconds
tag-switching tdp discovery {hello | directed-hello} {holdtime | interval}

Syntax Description

Default

See the syntax descriptions.

Command Mode

Global configuration

Example

In the following example, the interval for which a connection stays up if no Hello packets are received is set to 5 seconds.

Related Commands

show tag-switching interfaces
show tag-switching atm-tdp summary
show tag-switching tdp parameters

tag-switching tdp holdtime

To configure the hold time for a TDP session, use the tag-switching tdp holdtime global configuration command. To set the hold time to the default, use the no form of this command.

tag-switching tdp holdtime seconds

Syntax Description

Default

15 seconds

Command Mode

Global configuration

Usage Guidelines

When a TDP session is initiated, the hold time is negotiated to the lower of the values configured at the two ends.

This command configures the hold time determined by this tag switch.

Example

The following example configures the hold time of TDP sessions to 30 seconds.

Related Command

show tag-switching tdp parameters

tag-switching tsp-tunnels

To enable support for TSP tunnel negotiation, use the tag-switching tsp-tunnels global configuration command or interface configuration command. To disable support for TSP tunnel negotiation, use the no form of this command.

tag-switching tsp-tunnels
no tag-switching tsp-tunnels

Syntax Description

This command has no keywords or arguments.

Default

Disabled

Command Modes

Global configuration
Interface configuration

Usage Guideline

Enabling TSP tunnel negotiation using the tag-switching tsp-tunnels command in the interface configuration mode has no effect unless command is also issued in the global configuration mode.

Example

The following example shows how to enable TSP tunnel negotiation globally, then enable it at the interface.

Related Command

show tag-switching tsp-tunnels

tftp-server

To specify that the switch or Flash device operates as a TFTP server, use the tftp-server global configuration commands. To remove a previously defined filename, use the no form of this command with the appropriate filename.

tftp-server flash [device:] filename1 [alias filename2] [rom alias filename2] [atm-accounting
filename3]
no tftp-server flash [device:] filename1 [alias filename2] [rom alias filename2]
[atm-accounting filename3]

Syntax Description

Default

Disabled

Command Mode

Global configuration

Usage Guidelines

You can specify multiple filenames by repeating the tftp-server command. The system sends a copy of the system image contained in ROM or one of the system images contained in Flash memory to any client that issues a TFTP Read Request with this filename.

If the specified filename1 or filename2 exists in Flash memory, a copy of the Flash image is sent. On systems that contain a complete image in ROM, the system sends the ROM image if the specified filename1 or filename2 is not found in Flash memory.

Images that run from ROM cannot be loaded over the network. Therefore, you should not use TFTP to offer the ROMs on these images.

The system sends a copy of the file contained on one of the Flash memory devices to any client that issues a TFTP Read Request with its filename.

Examples

In the following example, the system uses TFTP to send a copy of the version-11.1 file located in Flash memory in response to a TFTP Read Request for that file. The requesting host is checked against access list 22.

In the following example, the system uses TFTP to send a copy of the version-11.1.4 file in response to a TFTP Read Request for that file. The file is located on the Flash memory card inserted in slot 0 of the processor card.

Related Command

access-list (extended)

timer

To configure the PNNI timers, use the timer PNNI node configuration command. To return to the default values, use the no form of this command.

timer [ack delay tenths-of-seconds] [called-integrity seconds]
[calling-integrity seconds] [hello-holddown tenths-of-seconds] [hello-interval seconds]
[hrz-link-inactivity seconds] [inactivity-factor number] [retransmit-interval seconds]
no timer [ack delay] [called-integrity] [calling-integrity] [hello-holddown] [hello-interval]
[hrz-link-inactivity] [inactivity-factor] [retransmit-interval]

Syntax Description

Default

See the syntax descriptions.

Command Mode

PNNI node configuration

Usage Guidelines

Decreasing the hello-interval allows PNNI to detect neighbor nodes that have stopped functioning more quickly. The inactivity-factor is used as a multiplier of the hello-interval in received Hello packets to determine the dead interval, the time after which the neighbor node is declared down if no Hello packets are received. The inactivity-factor can be increased on unreliable interfaces to avoid false alarms.

Decreasing the retransmit-interval causes retransmission to increase when a PNNI packet gets lost. However, this increases the risk of unnecessarily retransmitting PNNI packets that are delayed but actually reaches the neighbor. Increasing ack-delay causes more PTSEs to be acknowledged in one ack packet. Lowering hello-holddown allows another Hello packet to be sent shortly after one was sent. To avoid an overload in switch processing, you should adjust these parameters carefully.

For more information, refer to the LightStream 1010 ATM Switch and Catalyst 8510 MSR Software Configuration Guide.

Example

The following script shows how to change the hello-interval to 5 seconds.

Related Command

show atm pnni local-node

transit-restricted

To indicate to the network that this node does not allow calls to transit through, use the transit-restricted PNNI node configuration command. To allow calls to transit through the node, use the no form of this command.

transit-restricted
no transit-restricted

Syntax Description

This command has no keywords or arguments.

Default

Enabled

Command Mode

PNNI node configuration

Usage Guidelines

This command enables the network administrator to prevent connections from transiting nodes that only originate or terminate connections, for example, low-end edge switches that do not have the capacity to support transit calls.

For more information, refer to the LightStream 1010 ATM Switch and Catalyst 8510 MSR Software Configuration Guide.

Example

The following script shows how to access the transit-restricted PNNI node configuration command.

Related Command

show atm pnni local-node

transmit-interface

tunnel

tx-queue-limit