Manual

Layer 2 Tunnel Protocol Version 3

How to Configure Layer 2 Tunnel Protocol Version 3

Cisco IOS Releases 12.0(29)S and 12.2(25)S

is too small. If the L2TPv3 Control Channel Hashing feature is enabled, message digest validation must

be enabled. Message digest validation deactivates the data path received sequence number update and

restricts the minimum local receive window size to 35.

You may choose to configure control message authentication or control message integrity checking. The

control message authentication requires participation by both peers, and a shared secret must be

configured on both routers. The control message integrity check is unidirectional, and requires

configuration on only one of the peers.

This task configures L2TPv3 Control Channel Hashing feature for an L2TP class.

SUMMARY STEPS

1. enable

2. configure terminal

3. l2tp-class [l2tp-class-name]

4. digest [secret [0 | 7] password] [hash {md5 | sha}]

5. digest check

6. hidden

DETAILED STEPS

Command or Action Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

• Enter your password if prompted.

Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.