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New Features in Junos OS Release 10.4 for SRX Series Services Gateways and J Series Services Routers
Point-to-Point Protocol over Ethernet (PPPoE)
R2CP radio-to-router protocol support
—This feature is supported on all SRX Series and
J Series devices.
Junos OS Release 10.4 supports the Network Centric Waveform (NCW) radio-specific
radio-to-router control protocol (R2CP), which is similar to the PPPoE radio-to-router
protocol. Both of these protocols exchange dynamic metric changes in the network
that the routers use to update the OSPF topologies.
In radio-router topologies, the router connects to the radio over a Gigabit Ethernet link
and the radio transmits packets over the radio frequency (RF) link. The radio periodically
sends metrics to the router, which uses RF link characteristics and other data to inform
the router on the shaping and OSPF link capacity. The router uses this information to
shape the data traffic and provide the OSPF link cost for its SPF calculations. The radio
functions like a Layer 2 switch and can only identify remote radio-router pairs using
Layer 2 MAC addresses. With R2CP the router receives metrics for each neighboring
router, identified by the MAC address of the remote router. The R2CP daemon translates
the MAC addresses to link the local IPv6 addresses and sends the metrics for each
neighbor to OSPF. Processing these metrics is similar to the handling of PPPoE PADQ
metrics. Unlike PPPoE, which is a point-to-point link, these R2CP neighbors are treated
as nodes in a broadcast LAN.
You must configure each neighbor node with a per-unit scheduler for CoS. The scheduler
context defines the attributes of Junos class-of-service(CoS). To define CoS for each
radio, you can configure virtual channels to limit traffic. You need to configure virtual
channels for as many remote radio-router pairs as there are in the network. You
configure virtual channels on a logical interface. You can configure each virtual channel
to have a set of eight queues with a scheduler and an optional shaper. When the radio
initiates the session with a peer radio-router pair, a new session is created with the
remote MAC address of the router and the VLAN over which the traffic flows. Junos
OS chooses from the list of free virtual channels and assigns the remote MAC and the
eight CoS queues and the scheduler to this remote MAC address. All traffic destined
to this remote MAC address is subjected to the CoS that is defined in the virtual channel.
A virtual channel group is a collection of virtual channels. Each radio can have only one
virtual channel group assigned uniquely. If you have more than one radio connected
to the router, you must have one virtual channel group for each local radio-to-router
pair.
Although a virtual channel group is assigned to a logical interface, a virtual channel is
not the same as a logical interface. The only features supported on a virtual channel
are queuing, packet scheduling, and accounting. Rewrite rules and routing protocols
apply to the entire logical interface.
[LN1000 Mobile Secure Router User Guide]
Copyright © 2011, Juniper Networks, Inc.
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