L2TP Network Server Command Reference

This command creates a text description which is stored in the configuration file to help identify the content of the entity.

The no form of the command removes the string from the configuration.

This command administratively disables the entity. When disabled, an entity does not change, reset, or remove any configuration settings or statistics. Many entities must be explicitly enabled using the no shutdown command.

The shutdown command administratively disables an entity. The operational state of the entity is disabled as well as the operational state of any entities contained within. Many objects must be shut down before they may be deleted.

This command configures an LNS group.

The no form of the command removes the LNS group ID from the configuration.

This command configures an L2TP ISA Media Dependent Adapter (MDA) for the L2TP ISA group.

The no form of the command removes the MDA ID from the configuration.

This command enables policies referenced in the configure>port-policy context to be created under ports. These are the ports that link the carrier IOM to the ISA, and are hidden within the system (they cannot be created through the CLI). They are created automatically. Use the show port command to view information.

Currently only the port scheduler policy is supported. Each lns-esm port in the lns-group receives an independent port scheduler instance. The port schedulers are instantiated in the carrier IOM on the lns-esm ports that carry PPPoE traffic in the downstream direction towards the ISA before the PPPoE traffic is L2TP encapsulated.

The no form of the command removes the policy name from the configuration.

This command instantiates a port policy manager that applies policies (port scheduler) to be hidden, dynamically created ports for WLAN GW/LNS/NAT.

The no form of the command removes the policy name from the configuration.

This command references a port scheduler policy that is defined under the configure>qos>port-scheduler-policy> hierarchy. Port schedulers are instantiated on carrier IOMs towards all ISAs that are part of the lns-group.

The no form of the command removes the port scheduler policy from the configuration.

This command configures an ISA LNS group MDA.

The no form of the command removes the MDA ID from the LNS group configuration.

This command configures an ISA NAT group.

The no form of the command removes the ID from the configuration.

This command configures the ISA NAT group maximum number of MDA.

The no form of the command removes the number from the configuration.

This command configures an ISA NAT group MDA.

This command configures the ISA NAT group session limits.

This command configures the number of sessions rper block that will be reserved for prioritized sessions.

This command configures the ISA NAT group watermarks.

This command is applicable only to LAC. MRRU option is an indication that the session is of MLPPPoX type. The 7750 SR LAC will never initiate MRRU option in LCP negotiation process. However, it will respond to MRRU negotiation request by the client.

This command provides an option to specifically enable or disable negotiation of MLPPPoX on a capture SAP level or on a group-interface level.

This command is applicable only to LNS.

The tunnel can be explicitly activated (assuming that the parent group is in a no shutdown state) or deactivated by the up and down keywords.

If case that there is no admin-state configured, the tunnel will inherit its administrative state from its parent (group).

This command is applicable within the LAC/LNS context. It provides the last mile link encapsulation information that is needed for proper (shaping) rate calculations and interleaving delay in the last mile.

The encapsulation value will be taken from the following sources in the order of priority:

In case that the encapsulation information is not provided by any of the existing means (LUDB, RADIUS, AVP signaling, PPPoE Tags), then by default pppoea-null encapsulation will be in effect.

The following values are supported encapsulation values on LNS in the 7750 SR.

encap-type:

The values are not supported encapsulation values on LNS in the 7750 SR.

When configured under the l2tp hierarchy, this command is applicable to LNS.

Within the ppp-policy, this command is applicable only to LAC.

The endpoint, according to RFC 1990, represents the system transmitting the packet. It is used during MLPPPoX negotiation phase to distinguish this peer from all others.

In the case that the client rejects the endpoint option during LCP negotiation, the LAC and the LNS must be able to negotiate the LCP session without the endpoint option.

The no form of this command disables sending endpoint option in LCP negotiation.

This command is applicable only to LNS. Interleaving is supported only on MLPPPoX bundles that contain a single member link. If more than one link is present in the MLPPPoX bundle, interleaving will be automatically disabled and a TRAP/log (tmnxMlpppBundleIndicatorsChange) will be generated.

The minimum supported rate of the link on which interleaving is performed is 1kbps.

If configured at this level, interleaving will be enabled on all tunnels within the group, unless it is explicitly disable per tunnel.

This command is applicable only to LNS. Interleaving is supported only on MLPPPoX bundles that contain a single member link. If more than one link is present in the MLPPPoX bundle, interleaving will be automatically disabled and a TRAP/log (tmnxMlpppBundleIndicatorsChange ) will be generated.

The minimum supported rate of the link on which interleaving is performed is 1kbps.

Interleaving configured on this level will overwrite the configuration option under the group hierarchy. If the no form of the command is configured for interleaving at this level, the interleaving configuration will inherit the configuration option configured under the l2tp group.

This command is applicable only to LNS. By default traffic load balancing between the BB-ISAs is based on sessions. Each session is individually assigned to an BB-ISA during session establishment phase.

By introducing MLPPPoX, all sessions of a bundle must be terminated on the same LNS BB-ISA. This is necessary for two reasons:

Therefore, if fragmentation is enabled, load-balancing per tunnel must be configured. In the per tunnel load-balancing mode, all sessions within the same tunnel are terminated on the same LNS BB-ISA.

In the case that we have MLPPPoX sessions with a single member link, both load-balancing methods are valid.

The no form of this command set the per session load balancing.

This command is applicable only to LNS. It determines the maximum fragment delay caused by the transmission that will be imposed on a link.

Fragmentation can be used to interleave high priority packet in-between low priority fragments on a MLPPPoX session with a single link or on a MLPPPoX session with multiple links to better load balance traffic over multiple member links.

This command is applicable only to LNS. It determines the maximum number of links that can be put in a bundle.

Any attempt of a session to join a bundle that is above the max-link limit will be rejected.

If interleaving is configured, it is recommended that max-links be set to 1 or a 創oversion of the command is used (no max-links). Both have the same effect.

The configuration under the tunnel hierarchy will override the configuration under the group hierarchy.

The no form of this command limits the number of links in the bundle to 1.

This command is applicable only to LNS. It determines the time during which the LNS keeps fragments of the same packet in the buffer before it discards them. The assumption is that if the fragments do not arrive within certain time, the chance is that they were lost somewhere in the network. In this case the partial packet cannot be reassembled and all fragments that has arrived up to this point and are stored in the buffer will be discarded in order to free up the buffer. Otherwise, a condition will arise in which partial packets will be held in the buffer until the buffer is exhausted.

The configuration under the tunnel hierarchy will override the configuration under the group hierarchy.

The no form of this command also sets the time-out to 1000ms.

This command is applicable to LAC and LNS. It provides the last mile link rate in the downstream direction that is needed for proper shaping and calculating the interleaving delay.

The rate information in the last mile will be taken from the following sources in the order of priority:

This command enables a peer request to send short sequence numbers. This command is applicable to LAC and LNS. By default, MLPPPoX will negotiate 24bit long sequence numbers. This command allows this to be changed to shorter, 12-bit sequence numbers.