Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010, Configuration Manual

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For more information about using the subscriber management application, see
JUNOSe Broadband Access Configuration Guide .
Placing Dynamic IP Routes in the Routing Table
If you want to insert a dynamic IP route into the routing table of the relevant virtual
router to point to the subscriber’s subinterface, you can use the Framed-Route [22]
RADIUS attribute to do so. Defined by RFC 2865—Remote Authentication Dial In
User Service (RADIUS) (June 2000), the Framed-Route attribute can be returned in
Access-Accept messages to specify the route as follows:
Framed-Route = ipAddress / mask nextHop
For dynamic IP interfaces, the next hop might not be known when you create the
user record. In this case, use the value 0.0.0.0 for the next hop; the E Series router
then assigns the subinterface associated with the user as the next hop in the routing
table.
auto-configure Command
You use the auto-configure command to configure an ATM 1483 subinterface to
support a dynamic interface. After the subinterface is configured, it performs
autodetection to identify the encapsulation, resulting in the dynamic creation of the
higher protocol layers. This command specifies one or more types of next upper
dynamic encapsulations that the static interfaces can detect or accept.
NOTE: On static ATM 1483 interfaces, dynamic encapsulation types can be bridged
Ethernet, IP, IPv6, PPP, or PPPoE.
Encapsulation Type Lockout
You can configure E Series routers to support dynamic encapsulation type lockout.
With this feature, you can temporarily prevent an ATM 1483 subinterface from
autodetecting, accepting, and creating dynamic interface columns for a configurable
time period.
On ATM 1483 subinterfaces, encapsulation type lockout is the default behavior for
IPoA, bridged Ethernet, PPP, and PPPoE encapsulation types.
Benefits
Using dynamic encapsulation type lockout provides the following benefits:
■
Enables autodetection of other encapsulation types when a dynamic interface
for a specified encapsulation type cannot be created.
For example, when running a PPPoE client, DSL modems might transmit bridged
Ethernet frames among the PPPoE frames. When bridged Ethernet and PPPoE
encapsulation types are configured for autodetection with the
auto-configure
command, and a subscriber is configured for the bridged Ethernet encapsulation
type, RADIUS sends a deny response after the router attempts to authenticate
About Configuring Dynamic Interfaces over Static ATM
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Chapter 17: Configuring Dynamic Interfaces