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CHAPTER 7
Configuring the R2CP Radio-to-Router
Protocol
R2CP Radio-to-Router Protocol Overview
Copyright © 2010, Juniper Networks, Inc.
R2CP Radio-to-Router Protocol Overview on page 45
Configuring the R2CP Radio-to-Router Protocol on page 46
Verifying R2CP Interfaces on page 49
The Network Centric Waveform (NCW) radio-specific radio-to-router control protocol
(R2CP) 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 the
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 address 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. 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. Each virtual channel can be configured 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.
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