Configuring Lac Tunnel Selection Parameters; Configuring The Failover Between Preference Levels Method - Juniper JUNOSE 11.1.X - BROADBAND ACCESS CONFIGURATION GUIDE 6-4-2010 Configuration Manual

JUNOSe 11.1.x Broadband Access Configuration Guide
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.
Related Topics

Configuring LAC Tunnel Selection Parameters

This section presents the capabilities of the LAC's tunnel selection process. L2TP
allows you to specify:
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 358.
When the E Series LAC determines that a PPP session should be tunneled, it selects
a tunnel from a set of tunnels associated with either the PPP user or the PPP user's
domain. The router provides the following methods for selecting tunnels:
1. Configuring the Failover Between Preference Levels Method on page 370
2. Configuring the Failover Within a Preference Level Method on page 371
3. Configuring the Maximum Sessions per Tunnel on page 372
4. Configuring the Weighted Load Balancing Method on page 372

Configuring the Failover Between Preference Levels Method

When a user tries to log into a domain, in the default method, the router attempts
to connect to a destination in that domain with the highest preference level. If more
than one destination in the preference level is considered reachable, the router
randomly selects a destination and attempts to contact it. If the router is unsuccessful,
it marks the destination as unreachable and does not try to connect to that destination
for five minutes. The router then moves to the next lower preference level and repeats
370
Configuring LAC Tunnel Selection Parameters
l2tp ignore-transmit-address-change
l2tp reject-transmit-address-change
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.
Tunnel selection failover between preference levels (the default behavior)
Tunnel selection failover within a preference level
Maximum sessions per tunnel
Weighted load balancing