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Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 5 Configuring the Layer 2 Tunnel Protocol Access Concentrator and Network Server
Layer 2 Access Concentrator
Restrictions for LAC
When configured as a LAC device, the Cisco 10000 series router has the following restrictions:
• The L2TP LAC per session features do not support PPP quality of service (QoS) and security access
control lists (ACLs).
• The Cisco 10000 series router does not support the configuration of L2TP tunnels over the
management Fast Ethernet interface. Do not set up L2TP tunnels over this interface.
Required Configuration Tasks for LAC
To configure the Cisco 10000 series router to act as a LAC, perform the following required configuration
task:
• Enabling the LAC to Look for Tunnel Definitions, page 5-7
Enabling the LAC to Look for Tunnel Definitions
To enable the LAC to look for tunnel definitions, you must enable the VPDN feature on the LAC. To
enable VPDN, enter the following commands:
Optional Configuration Tasks for LAC
To configure the Cisco 10000 series router as a LAC, perform any of the following optional tasks:
• Enabling Sessions with Different Domains to Share the Same Tunnel, page 5-8
• Enabling the LAC to Conduct Tunnel Service Authorization, page 5-8
• Configuring Sessions Per Tunnel Limiting on the LAC, page 5-12
Command Purpose
Step 1
Router> enable
Enters privileged EXEC mode.
Step 1
Router# config terminal
Enters global configuration mode.
Step 1
Router(config)# vpdn enable
Enables VPDN networking on the router and informs the
router to look for tunnel definitions in a local database and
on a remote authorization server (home gateway), if one is
present.
Step 2
Router(config)# vpdn-group group-name
Defines a local group name for which you can assign other
VPDN variables. Enters VPDN group configuration mode.
Step 3
Router(config-vpdn)# request-dialin
Enables the LAC to request L2TP tunnels to the
Cisco
10000 router and enters VPDN request-dialin group
mode.
Step 4
Router(config-vpdn-req-in)# protocol 12tp
Specifies the Layer 2 Tunnel Protocol.
Step 5
Router(config-vpdn-req-in)# exit
Returns to VPDN group configuration mode.
Step 6
Router(config-vpdn)# initiate-to ip ip-address
[priority priority-number]
Specifies the LNS IP address and optionally the priority of
the IP address (1 is the highest).