Selecting Service Modules For Lns Sessions Using Mlppp - Juniper JUNOSE SOFTWARE 11.2.X - BROADBAND ACCESS CONFIGURATION GUIDE 7-20-2010 Configuration Manual

JunosE 11.2.x Broadband Access Configuration Guide
Related Topics

Selecting Service Modules for LNS Sessions Using MLPPP

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Configuration
Destination address
Transport ipUdp
Virtual router default
Peer address 10.10.76.12
Statistics
Destination profile current session count is 0
Host profile attributes
Remote host is LAC
Configuration
Tunnel password is TunnelPass
Local host name is LNS
Local ip address is 46.1.1.2
Disconnect-cause avp is enabled
Tunnels are single-shot
Override out-of-resource-result-code is enabled
Statistics
Current session count is 0
1 L2TP host profile found
session-out-of-resource-result-code-override
show l2tp destination profile
You can install multiple service modules in an E Series router deployed as an LNS where
the tunnel sessions carry MLPPP. To use an LNS, at least one Service line module (SM),
ES2-S1 Service IOA, or a module that supports the use of shared tunnel-server ports must
be installed in the E Series router.
The router selects service modules based on the LNS sessions that underlie the PPP link
interfaces of an MLPPP bundle, also known as bundled sessions. To determine the
appropriate SM where it places the first bundled session for an MLPPP bundle, the router
uses a load-balancing mechanism. After the router determines the appropriate SM, it
places all sessions for the same bundle on the same SM. By default, the router determines
bundled membership based on the endpoint discriminator that the LNS receives from
the LAC in the proxy LCP information.
For example, an ERX1440 Broadband Services Router has service modules installed in
slots 4, 9, and 12. Using the load-balancing mechanism, the router determines that the
SM in slot 4 can accommodate the first bundled session for MLPPP bundle A, and places
it there. The first bundled session for bundle A has an endpoint discriminator of 5. The
router subsequently places all bundled sessions for bundle A (which have an endpoint
discriminator of 5) on the SM in slot 4.
When the SM on which the bundled sessions reside has no more space for additional
sessions, the router refuses the L2TP session. This can happen even when other service
modules installed in the router have available space.
For more information about endpoint discriminators, see the Configuring Multilink PPP
chapter in JunosE Link Layer Configuration Guide.
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