Cisco CRS-1 - Carrier Routing System Router Getting Started Manual page 272

Glossary
1. remote procedure call. Technological foundation of client/server computing. RPCs are procedure
RPC
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.
Reverse Path Forwarding. Multicasting technique in which a multicast datagram is forwarded out of all but
RPF
the receiving interface if the receiving interface is the one used to forward unicast datagrams to the source
of the multicast datagram.
Rivest, Shamir, and Adelman digital signature standard.
RSA
Resource Reservation Protocol. Protocol that supports the reservation of resources across an IP
RSVP
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.
The router configuration currently in effect. Although, the user can save multiple versions of the router
running
configuration for future reference, there is only one copy of the running configuration in the router at
configuration
any given time.
The receiver end of a fabric link. All links are unidirectional. See also Tx.
Rx
S
The switch module containing only S2 switch fabric elements. Located in the fabric chassis.
S/2 switch module
Fabric stage. Distributes traffic across all S2 stages.
S1 stage
Stages of the switch fabric. Data enters the switch fabric from one of the "sprayer" ASICs on a line
S1, S2, S3
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.
The switch module containing stages S1 and S3 of the switch fabric. Eight S1/3 boards are located in
S1/3 switch module
each line card rack of a multiple-chassis Cisco CRS-1 Series routing system.
A fabric card that contains all three stages of the switch fabric. Eight S123 boards are located in the
S123 switch module
line card racks for a 16-slot single-chassis configuration.
A type of fabric card that contains all three stages of the switch fabric and optical fiber connectors.
S123T switch
module 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.
Fabric stage. Primarily switching. Queueing based on which S3 stage its going to.
S2 stage
Fabric stage. Switching. Queueing based on egress fabric channel.
S3 stage
system controller on the Cisco router.
SC
shelf controller/fan controller. Combines shelf controller function and fan controller function on one
SCFC
card. Two are installed in each Fabric chassis.
Cisco CRS-1 Series Carrier Routing System Getting Started Guide
GL-14