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Chapter 9
Configuring Multihop
Restrictions for Multihop
The Multihop feature has the following restrictions:
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To preserve the IP TOS field of tunneled IP packets, the following restrictions apply:
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Required Configuration Tasks for Multihop
To configure the Multihop feature on the Cisco 10000 router, perform the following configuration tasks:
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Enabling VPDN and Multihop Functionality
To enable VPDN and multihop functionality, enter the following commands in global configuration
mode:
Command
Step 1
Router(config)# vpdn enable
Step 2
Router(config)# vpdn multihop
OL-2226-23
The performance routing engine, part number ESR-PRE1 does not support the Multihop feature.
Tunnel switching is based on a session's domain or tunnel in which the session arrived. The
Cisco 10000 router does not support switching of individual sessions by using the CLI.
The Cisco 10000 router does not support multichassis Multilink PPP (MLPPP).
The Cisco 10000 router supports the Multihop feature for L2TP, but does not support the L2F
protocol.
You cannot apply per session features to switched sessions. For example, you cannot apply an ACL
or a service policy to the sessions.
The Cisco 10000 router supports only the L2TP tunneling protocol.
The tunneled link must carry IP to preserve the TOS field.
The Cisco 10000 router does not support proxy PPP dialin.
Enabling VPDN and Multihop Functionality, page 9-3
Terminating the Tunnel from the LAC, page 9-4
Mapping the Ingress Tunnel Name to an LNS, page 9-4
Purpose
Enables VPDN functionality.
Enables VPDN multihop functionality.
Cisco 10000 Series Router Software Configuration Guide
Restrictions for Multihop
9-3
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Table of Contents
Troubleshooting
