Cisco CRS-1 - Carrier Routing System Router Getting Started Guide

Glossary
GL-14
Cisco CRS-1 Series Carrier Routing System Getting Started Guide
RPC
1. remote procedure call. Technological foundation of client/server computing. RPCs are procedure
calls that are built or specified by clients and executed on servers, with the results returned over the
network to the clients.
2. reverse path check. A security feature that checks that a packet was received on the same interface
from which the source IP address is expected.
RPF
Reverse Path Forwarding. Multicasting technique in which a multicast datagram is forwarded out of all but
the receiving interface if the receiving interface is the one used to forward unicast datagrams to the source
of the multicast datagram.
RSA
Rivest, Shamir, and Adelman digital signature standard.
RSVP
Resource Reservation Protocol. Protocol that supports the reservation of resources across an IP
network. Applications running on IP end systems can use RSVP to indicate to other nodes the nature
(bandwidth, jitter, maximum burst, and so on) of the packet streams they want to receive. RSVP
depends on IPv6. Also known as Resource Reservation Setup Protocol. See also IPv6.
running
configuration
The router configuration currently in effect. Although, the user can save multiple versions of the router
configuration for future reference, there is only one copy of the running configuration in the router at
any given time.
Rx
The receiver end of a fabric link. All links are unidirectional. See also Tx.
S
S/2 switch module
The switch module containing only S2 switch fabric elements. Located in the fabric chassis.
S1 stage
Fabric stage. Distributes traffic across all S2 stages.
S1, S2, S3
Stages of the switch fabric. Data enters the switch fabric from one of the “sprayer” ASICs on a line
card, then passes through an S1 element, an S2 element, and an S3 element, and finally arrives at one
of the “sponge” ASICs on the destination line cards.
S1/3 switch module
The switch module containing stages S1 and S3 of the switch fabric. Eight S1/3 boards are located in
each line card rack of a multiple-chassis Cisco CRS-1 Series routing system.
S123 switch module
A fabric card that contains all three stages of the switch fabric. Eight S123 boards are located in the
line card racks for a 16-slot single-chassis configuration.
S123T switch
module
A type of fabric card that contains all three stages of the switch fabric and optical fiber connectors.
Functionally the same as the S123 switch module. Includes an additional optical interface to cross
connect the line card chassis in a dual-chassis configuration. Eight 1T boards are used in each chassis
of the dual-chassis configuration.
S2 stage
Fabric stage. Primarily switching. Queueing based on which S3 stage its going to.
S3 stage
Fabric stage. Switching. Queueing based on egress fabric channel.
SC
system controller on the Cisco router.
SCFC
shelf controller/fan controller. Combines shelf controller function and fan controller function on one
card. Two are installed in each Fabric chassis.

Cisco CRS-1 - Carrier Routing System Router Specifications

General

Brand	Cisco
Model	CRS-1 - Carrier Routing System Router
Category	Network Router
Language	English