Cisco SCE8000 Specifications download pdf (Page 269)

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Cisco SCE 8000 CLI Command Reference

Chapter 2 CLI Command Reference

ip-tunnel l2tp skip

Configures the recognition of L2TP tunnels and skipping into the internal IPv4 or IPv6 packet.

To disable tunnel recognition and classify traffic by the external IP address, use the no form of this

command.

ip-tunnel l2tp skip

no ip-tunnel

Syntax Description This command has no arguments or keywords.

Command Default IP tunnel recognition is disabled.

Command Modes Interface Linecard Configuration

Command History This table includes the following release-specific history entries:

Usage Guidelines L2TP is an IP-based tunneling protocol. The system must be specifically configured to recognize the

L2TP flows, based on the UDP port used for L2TP. The Cisco SCE platform can then skip the external

IP, UDP, and L2TP headers and reach the internal IP, which is the actual subscriber traffic.

If L2TP is not configured, the system treats the external IP header as the subscriber traffic. All of the

flows in the tunnel are seen as a single flow.

On Cisco SCE 8000, L2TP skip mode supports only L2TP IPv6 over IPv4 and L2TP IPv4 over IPv4.

L2TP IPv6 over IPv6 and L2TP IPv4 over IPv6 flows are treated as native IPv6 flows.

IP tunnel mode is mutually exclusive with other MPLS or VLAN-based classifications.

To configure the port number that the LNS and LAC use for L2TP tunnels, use the l2tp identify-by

command.

Caution L2TP tunneling can be enabled or disabled only when no applications are loaded or the line card is shut

down.

Authorization: admin

Examples The following example shows how to enable recognition of L2TP tunnels.

Release Modification

3.0.0 This command was introduced.

4.1.0 Updated for IPv6.

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