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Point-to-Point Protocol. Successor to SLIP that provides router-to-router and host-to-network
PPP
connections over synchronous and asynchronous circuits. Whereas SLIP was designed to work with IP,
PPP was designed to work with several network layer protocols, such as IP, IPX, and ARA. PPP also
has built-in security mechanisms, such as CHAP and PAP. PPP relies on two protocols: LCP and NCP.
The first route processor configured for DSC or logical router operation. If a second RP is configured
primary RP
as a redundant RP, it becomes the secondary RP.
Q
quality of service. A set of parameters that describes a flow of data, such as guaranteed bandwidth,
QoS
delay, and delivery guarantee.
R
remote copy protocol. A protocol that allows users to copy files to and from a file system residing on
RCP
a remote host or server on the network. The RCP protocol uses TCP to ensure the reliable delivery of
data.
Routing Information Base. This is the set of all available routes from which to choose the FIB. The RIB
RIB
essentially contains all routes available for selection. Essentially, it is the sum of all routes learned by
dynamic routing protocols, all directly attached networks (that is. networks to which a given router has
interfaces connected), and any additional configured routes, such as static routes.
Routing Information Protocol. A simple routing protocol that is part of the TCP/IP protocol suite and
RIP
the most common IGP in the Internet. RIP determines a route based on the smallest hop count between
source and destination. It is a distance vector protocol that broadcasts routing information to
neighboring routers. It is known to use excessive bandwidth. See also hop count and IGP.
ROM Monitor
ROM Monitor is a bootstrap program that initializes the hardware and boots the system when a router
is powered on or reset. ROM Monitor mode is also known as "ROMMON," which reflects the CLI
prompts for the mode.
rommon B1> (Cisco CRS-1 routers)
or
rommon1> (Cisco XR 12000 Series Routers)
ROMMON
See ROM Monitor.
Network layer device that uses one or more routing metrics to determine the optimal path along which
router
network traffic should be forwarded. Routers forward packets from one network to another based on
network layer information.
Process of finding a path to a destination host. Routing is very complex in large networks because of
routing
the many potential intermediate destinations a packet might traverse before reaching its destination
host.
OL-10957-02
Cisco IOS XR Getting Started Guide
Glossary
GL-9
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Troubleshooting
