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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
L2TP Network Server
Example 5-12 Configuring the LNS
!Configures the VRF.
ip vrf vpn-1
rd 1100:1
!
!Configures the virtual template interface and associates the VRF to it.
interface virtual-template 1
ip vrf forwarding vpn-1
ip unnumbered loopback
ppp authentication chap
!
!Configures a VPDN group to ensure that all the sessions for a particular tunnel get the
same virtual template and thus the same VRF.
vpdn enable
vpdn-group 1
accept-dialin
protocol 12tp
virtual-template 1
terminate-from hostname lac1-vpn1
local name r4-1
12tp tunnel password 7 1511021F0725
12tp tunnel receive-window 100
12tp tunnel retransmit retries 7
12tp tunnel retransmit timeout min 2
Optional Configuration Tasks for LNS
To configure the Cisco 10000 series router as an LNS, perform as many of the following configuration
tasks as desired. All of these configuration tasks are optional.
• Configuring per VRF AAA Services, page 5-31
• Configuring a VRF on the LNS, page 5-36
• Configuring Sessions per Tunnel Limiting on the LNS, page 5-36
• Configuring RADIUS Attribute Accept or Reject Lists, page 5-37
• Configuring the LNS for RADIUS Tunnel Accounting, page 5-39
• Configuring the LNS for RADIUS Tunnel Authentication, page 5-42
Step 6
Router(config-vpdn-acc-in)# protocol 12tp
Specifies the Layer 2 Tunnel Protocol.
Step 7
Router(config-vpdn-acc-in)# virtual-template
template-number
Specifies the virtual template to be used to clone virtual
access interfaces.
Step 8
Router(config-vpdn-acc-in)# exit
Returns to VPDN group configuration mode.
Step 9
Router(config-vpdn)# terminate-from hostname
host-name
Specifies the host name of the remote L2TP access
concentrator (LAC) that will be required when accepting a
VPDN tunnel.
Command Purpose