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9-3
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 9 Configuring Multihop
Restrictions for Multihop
Restrictions for Multihop
The Multihop feature has the following restrictions:
• 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.
To preserve the IP TOS field of tunneled IP packets, the following restrictions apply:
• 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.
Required Configuration Tasks for Multihop
To configure the Multihop feature on the Cisco 10000 router, perform the following configuration tasks:
• 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
Enabling VPDN and Multihop Functionality
To enable VPDN and multihop functionality, enter the following commands in global configuration
mode:
Command Purpose
Step 1
Router(config)# vpdn enable
Enables VPDN functionality.
Step 2
Router(config)# vpdn multihop
Enables VPDN multihop functionality.