Juniper JUNOSE 11.0.X MULTICAST ROUTING, Configuration Manual

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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
l2tp ignore-transmit-address-change
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l2tp reject-transmit-address-change
Configuring LAC Tunnel Selection Parameters
This section presents the capabilities of the LAC’s tunnel selection process. L2TP
allows you to specify:
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Up to 31 destinations for a domain.
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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.
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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 352.
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:
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Tunnel selection failover between preference levels (the default behavior)
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Tunnel selection failover within a preference level
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Maximum sessions per tunnel
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Weighted load balancing
1. Configuring the Failover Between Preference Levels Method on page 364
2. Configuring the Failover Within a Preference Level Method on page 365
3. Configuring the Maximum Sessions per Tunnel on page 366
4. Configuring the Weighted Load Balancing Method on page 366
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
364 ■
Configuring LAC Tunnel Selection Parameters
JUNOSe 11.0.x Broadband Access Configuration Guide