MPLS TE

MSC

MTU

multicast

Glossary

Multiprotocol Label Switching traffic engineering. A switching method that forwards IP traffic using a label. This label instructs the routers and switches in the network where to forward the packets based on pre-established IP routing information.

modular services card. Module in which the ingress and egress packet processing and queueing functions are carried out in the Cisco CRS-1 architecture. Up to 16 MSCs are installed in a line card chassis; each MSC must have an associated physical line interface module (PLIM) (of which there are several types to provide a variety of physical interfaces). The MSC and PLIM mate together on the line card chassis midplane. See also PLIM.

MSCs are also referred to as line cards.

maximum transmission unit. Maximum packet size, in bytes, that a particular interface can handle.

Multicast is a feature that refers to single packets copied by the network and sent to a specific subset of network addresses. These addresses are specified in the Destination Address Field. See also unicast.

N

netboot

Loading software images from a network server, such as TFTP.

node

A card installed and running on the router.

NSF

nonstop forwarding. Packets keep flowing during events such as failover, process restarts, and the

 

upgrade or downgrade of software packages. Nonstop forwarding is the ability of a router to continue

 

to forward traffic toward a router that may be recovering from a transient failure and the ability of a

 

router recovering from a transient failure in the control plane to continue correctly forwarding traffic

 

sent to it by a peer.

NTP

Network Time Protocol. Protocol built on top of TCP that ensures accurate local time-keeping with

 

reference to radio and atomic clocks located on the Internet. This protocol is capable of synchronizing

 

distributed clocks within milliseconds over long time periods.

NVRAM

nonvolatile RAM. Static random access memory that is made into nonvolatile storage by having a

 

battery permanently connected.

O

OC-x

Optical carrier, where x=3, 12, 48, or 192, relating to the various speeds within a SONET network.

OIR

online insertion and removal. Feature that permits the addition, replacement, or removal of cards

 

without interrupting the system power, entering console commands, or causing other software or

 

interfaces to shut down. Sometimes called hot-swapping or power-on servicing.

 

 

Cisco IOS XR Getting Started Guide

 

 

 

 

 

 

 

OL-10957-02

 

 

GL-7

 

 

 

 

 

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Cisco Systems Cisco IOS XR manual Loading software images from a network server, such as Tftp, Sent to it by a peer, GL-7