Specifications

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Cisco SCE 2000 and SCE 1000 CLI Command Reference
OL-26797-03
Chapter 2 CLI Command Reference
l2tp identify-by
l2tp identify-by
Configures the port number that the LNS and LAC use for L2TP tunnels.
l2tp identify-by port-number port-number
l2tp identify-by default port
Syntax Description
Command Default port-number = 1701
Command Modes Linecard Interface Configuration
Command History This table includes the following release-specific history entries:
Usage Guidelines Use the default port keyword to replace the user-configured port number with the default port.
Note that if external fragmentation exists in the L2TP environment, it is required to configure a
quick-forwarding-ignore Traffic Rule (see the section "Configuring Traffic Rules and Counters" in the
Cisco SCE 2000 and SCE 1000 Software Configuration Guide) that bypasses all IP traffic targeted to
either the LNS or LAC IP address. This will make sure that any packets not having the L2TP port
indication (i.e. non-first fragments) will not require handling by the traffic processors.
In addition, in order to prevent reordering of L2TP tunneled fragments, it is advised to define a
quick-forwarding traffic-rule for all the L2TP traffic. This can be done based on the IP ranges in use by
the internal IPs in the tunnel (as allocated by the LNS), or simply for all of the traffic passing through
the SCE platform.
Note that flow redirection and flow blocking cannot be performed on the quick-forwarded traffic.
Authorization: admin
Examples The following example configures port# 1000 as the L2TP port.
SCE>enable 10
Password:<cisco>
SCE#config
SCE(config)#interface linecard 0
SCE(config if)#l2tp identify-by port-number 1000

SCE(config if)#
port-number The port number to be configured for L2TP tunnels.
Release Modification
2.5.7 This command was introduced.