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JunosE 11.2.x Broadband Access Configuration Guide
Related Topics
Enabling Tunnel Switching
Related Topics
Creating Persistent Tunnels
Related Topics
Testing Tunnel Configuration
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L2TP tunnel switching allows you to switch packets between one session terminating
at an L2TP LNS and another session originating at an L2TP LAC. What distinguishes a
tunnel-switched LAC from a conventional one is that there are two interface columns:
one for the incoming session (LNS) and one for the outgoing session (LAC). The router
forwards traffic from the incoming session to the outgoing session and vice versa.
You can select tunnel switching on a per-chassis basis. By default, tunnel switching is
disabled. This preserves current behavior and prevents inadvertent attempts to switch
tunnels.
NOTE: Each individual L2TP session involved in tunnel switching is counted toward the
maximum number of sessions supported on an E Series router.
To enable tunnel switching:
host1(config)#l2tp tunnel-switching
l2tp tunnel-switching
The E Series router supports persistent tunnels. A persistent tunnel is one that is configured
to remain available. Persistent tunnels have only local significance; that is, they apply
only to the end of the tunnel where they are set. If the other end of the tunnel chooses
to terminate the tunnel, the tunnel is removed.
To create a persistent tunnel, you configure an idle-timeout value of zero.
host1(config)#l2tp tunnel idle-timeout 0
l2tp tunnel idle-timeout
You can use the l2tp tunnel test command to force the establishment of a tunnel—this
enables you to verify both the tunnel configuration and connectivity.
This command supports tunnel initiation: incoming calls on the LAC; outgoing calls on
the LNS. The command does not support tunnel respondent: outgoing calls on the LAC;
incoming calls on the LNS.
To test a tunnel configuration:
Copyright © 2010, Juniper Networks, Inc.
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