Configuring Lac Tunnel Selection Parameters - Juniper JUNOSE SOFTWARE 11.2.X - BROADBAND ACCESS CONFIGURATION GUIDE 7-20-2010 Configuration Manual

JunosE 11.2.x Broadband Access Configuration Guide
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Configuring LAC Tunnel Selection Parameters

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communicate with the endpoint. However, you can configure the LAC to ignore or reject
the requested change. Setting up the LAC to ignore address changes in SCCRP packets
enables the router to construct tunnels with separate receive and transmit addresses
and to avoid problems due to a misconfiguration. Three possible configurations are
available:
Default configuration—The E Series LAC accepts the change from the endpoint. The
LAC then sends all subsequent packets to, and accepts packets from, the new address.
Ignore configuration (specified by the l2tp ignore-transmit-address-change
command)—The LAC continues to send packets to the original address but accepts
packets from the new address.
host1(config)#l2tp ignore-transmit-address-change
Use the ip-address or udp-port keyword to ignore the specific address component. Omit
the keywords to ignore the entire address change in the SCCRP packet.
Reject configuration (specified by the l2tp reject-transmit-address-change
command)—The LAC sends a Stop-Control-Connection-Notification (StopCCN) to
the original address, then terminates the connection to the endpoint.
host1(config)#l2tp reject-transmit-address-change ip-address
Use the ip-address or udp-port keyword to reject the specific address component.
Omit the keywords to reject the entire address change in the SCCRP packet.
The reject specification takes precedence over the ignore specification.
The router accepts a change in receive address only once, during the tunnel establishment
phase, and only on an SCCRP packet. Subsequent changes result in the router dropping
packets. Any changes do not affect established tunnels.
Use the show l2tp command to display the SCCRP address change configuration.
l2tp ignore-transmit-address-change
l2tp reject-transmit-address-change
This section presents the capabilities of the LAC's tunnel selection process. L2TP allows
you to specify:
Up to 31 destinations for a domain.
Up to eight levels of preference. Preference indicates the order in which the router
attempts to connect to the destinations specified for a domain. Zero (0) is the highest
level of preference.
Up to 31 destinations for a single preference level.
For information about setting up destinations and preference levels for a domain, see
"Mapping a User Domain Name to an L2TP Tunnel Overview" on page 351.
Copyright © 2010, Juniper Networks, Inc.