Juniper IP SERVICES - CONFIGURATION GUIDE V 11.1.X, Configuration Manual

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The access node sending a single copy of the multicast stream to a specific access
node is a more efficient use of the bandwidth. Using this method, the access node
performs the multicast replication for subscribers that reside beyond the access node.
ANCP transactional multicast enables the E Series router to set up a multicast
replication state in the access node. In Asynchronous Transfer Mode (ATM) access
networks, the B-RAS can use the ANCP to set up point-to-multipoint cross-connects
in the access nodes.
OAM
A simple solution based on ANCP provides B-RAS with an access-line test capability.
When enabled through the CLI, the B-RAS uses an ANCP message to trigger the
access-node to perform a loopback test on the local loop (between the access node
and the CPE). The access node reports the results of the test by means of another
ANCP message.
Retrieval of DSL Line Rate Parameters
The router retrieves the DSL line rate parameters from ANCP and reports this
information to the SRC software with the corresponding COPS messages. If the router
cannot retrieve the DSL line rate parameters from ANCP, it retrieves the DSL
information in the following ways:
■
From AAA layer —For PPP interfaces, the router retrieves the DSL line rate
parameters from the AAA layer and reports this information to the SRC software.
■
From DHCP options —For DHCP external server and DHCP local server in
equal-access mode, the router retrieves the DSL line rate parameters from DHCP
options and reports this information to the SRC software. For more information
about retrieval of DSL line rate parameters from DHCP options, see DHCP
Overview Information.
Learning the Partition ID from an Access Node
ANCP running on the network access server can learn the partition ID from an access
node and use this partition ID to communicate with the access node. This learning
option of the ANCP in the virtual router enables the network access server to learn
the partition IDs from all the access nodes. This learned partition ID can be used to
send messages to establish adjacency.
Platform Considerations
Configuring ANCP is supported on all E Series Broadband Services Routers.
For information about the modules supported on E Series routers:
■
See the ERX Module Guide for modules supported on ERX7xx models, ERX14xx
models, and the ERX310 Broadband Services Router.
■
See the E120 and E320 Module Guide for modules supported on the E120 and
E320 Broadband Services Routers.
Platform Considerations
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Chapter 7: Configuring ANCP