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5-28
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
Feature History for LNS
Restrictions for the LNS
To function as a LNS, the Cisco 10000 series router has the following restrictions:
• 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.
• In Cisco IOS Release 12.3(7)XI1, the output rate limited traffic on an L2TP VAI can be lower than
than in previous releases due to increases in the overhead included in the policed bps rate.
The configured police bps rate when applied to an L2TP virtual access interface includes the
following 40 bytes of per packet overhead:
–
L2TP (8 bytes)
–
PPP (4 bytes)
–
Outer IP (20 bytes)
–
UDP (8 bytes)
Prerequisites for LNS
To function as an LNS, the Cisco 10000 series router has the following requirements:
• Before you configure RADIUS tunnel accounting or authentication, you must first:
–
Enable AAA on the LNS and the LAC by using the aaa new-model global configuration
command. For more information, see the “AAA Overview” chapter in the Cisco IOS Security
Configuration Guide, Release 12.2.
–
Configure the LNS and LAC to communicate with the RADIUS server. For more information,
see the
“Configuring the LAC to Communicate with the RADIUS Server” section on page 5-11
and see the “Configuring RADIUS” chapter in the Cisco IOS Security Configuration Guide,
Release 12.2.
Note For more information, see the “Configuring Accounting,” “Configuring Authentication,” and
“Configuring RADIUS” chapters in the Cisco IOS Security Configuration Guide, Release 12.2.
Cisco IOS Release Description Required PRE
12.2(4)BZ1 This feature was introduced on the Cisco 10000 series
router.
PRE1
12.3(7)XI1 This feature was integrated into Cisco IOS Release
12.3(7)XI1.
PRE2
12.2(28)SB This feature was integrated into Cisco IOS Release
12.2(28)SB.
PRE2