Managing The L2Tp Destination Lockout Process; Modifying The Lockout Procedure - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - BROADBAND ACCESS CONFIGURATION GUIDE 2010-10-12 Configuration Manual

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Managing the L2TP Destination Lockout Process

Modifying the Lockout Procedure

Copyright © 2010, Juniper Networks, Inc.
To set up the router to always generate the Receive Speed (AVP 38), complete the
following steps:
On the ATM subinterface, configure the advisory receive speed. See Configuring ATM
1.
in the JunosE Link Layer Configuration Guide for information about configuring the
advisory speed.
host1(config-subif)#atm atm1483 advisory-rx-speed 2000
Specify that the RX Speed AVP is always generated. If you do not specify this
2.
command, the RX Speed AVP is generated only when the RX speed differs from the
TX speed.
host1(config)#l2tp rx-connect-speed-when-equal
atm atm1483 advisory-rx-speed
l2tp rx-connect-speed-when-equal command
When multiple sets of tunneling parameters are available, L2TP uses a selection algorithm
to choose the best tunnel for subscriber traffic. As part of this selection process, the
JunosE Software's L2TP implementation includes a lockout feature in which the router
locks out, or disregards, destinations that are assumed to be unavailable.
By default, when a destination becomes unavailable, L2TP locks out that destination for
a lockout timeout of 300 seconds (5 minutes). After the lockout timeout expires, L2TP
assumes that the destination is now available and includes the destination when
performing the selection algorithm.
Tasks to manage the L2TP lockout process include:
Modifying the Lockout Procedure on page 365
1.
Verifying That a Locked-Out Destination Is Available on page 367
2.
3. Configuring a Lockout Timeout on page 367
Unlocking a Destination that is Currently Locked Out on page 367
4.
Starting an Immediate Lockout Test on page 368
5.
You can optionally configure your own lockout procedure by specifying the lockout
timeout you want to use or enabling a lockout test, or both. When the lockout timeout
expires, the destination is either immediately unlocked (if lockout testing is not enabled)
or begins the lockout test to verify that the destination is available.
L2TP performs the lockout test by attempting to establish a tunnel to the unavailable
destination. For the test, L2TP must first obtain the parameters for a tunnel to the
destination. If no such tunnel currently exists, L2TP must wait until it receives a new
session request that has tunnel parameters for the locked out destination. The destination
remains locked out while L2TP waits for the tunnel parameters and becomes available
Chapter 12: Configuring an L2TP LAC
365