On a T640 routing node, provides control and monitoring functions for router components , working in conjunction with a Routing Engine.
CCC
Circuit cross-connect. A JUNOS software feature that allows you to configure transparent connections between two circuits, where a circuit can be a Frame Relay DLCI, an ATM VC, a PPP interface, a Cisco HDLC interface, or an MPLS label-switched path (LSP).
CE device
Customer edge device. Router or switch in the customer's network that is connected to a service provider's provider edge (PE) router and participates in a Layer 3 VPN.
CFM
Cubic feet per minute. Measure of fan speed.
channel service unit
See [CSU/DSU]
CIDR
Classless interdomain routing. A method of specifying Internet addresses in which you explicitly specify the bits of the address to represent the network address instead of determining this information from the first octet of the address.
CIP
Connector Interface Panel. On an M160 or M40e router or a T640 routing node, the panel that contains connectors for the Routing Engines and alarm relay contacts.
circuit cross-connect
See [CCC]
class of service
See [CoS]
CLI
Command-line interface. Interface provided for configuring and monitoring the routing protocol software.
client peer
In a BGP route reflection, a member of a cluster that is not the route reflector.
See also [nonclient peer]
CLNP
Connectionless Network Protocol. ISO-developed protocol for OSI connectionless network service. CLNP is the OSI equivalent of IP.
cluster
In BGP, a set of routers that have been grouped together. A cluster consists of one system that acts as a route reflector, along with any number of client peers. The client peers receive their route information only from the route reflector system. Routers in a cluster do not need to be fully meshed.
community
In BGP, a group of destinations that share a common property. Community information is included as one of the path attributes in BGP update messages.
confederation
In BGP, a group of systems that appears to external autonomous systems to be a single autonomous system.
constrained path
In traffic engineering, a path determined using RSVP signaling and constrained using CSPF. The ERO carried in the packets contains the constrained path information.
core
The central backbone of the network.
CoS
Class of service. A group of privileges and features assigned to a particular service.
CPE
Customer premises equipment. Telephone or other service provider equipment located at a customer site.
craft interface
Mechanisms used by a Communication Workers of America craftsperson to operate , administer, and maintain equipment or provision data communications. On a Juniper Networks router, the craft interface allows you to view status and troubleshooting information and perform system control functions.
CSNP
Complete sequence number PDU. Packet that contains a complete list of all the LSPs in the IS-IS database.
CSPF
Constrained Shortest Path First. An MPLS algorithm that has been modified to take into account specific restrictions when calculating the shortest path across the network.
CSU/DSU
Channel service unit/data service unit. Channel service unit connects a digital phone line to a multiplexer or other digital signal device. Data service unit connects a DTE to a digital phone line.