Cisco Systems 12000

4Cisco Product Catalog, December, 2000

It provides the following key functions:

•Gigabit speed interconnections between line cards (5 Gbps per slot)

•State-of-the-artscheduling algorithm combined with Virtual Output Queues to eliminate head-of-line blocking (HOLB)

achieving 99% efﬁciency

•Hardware based multicast

•High Availability via redundancy (1:4 for SFC, 1:1 for CSC) with loss-less failover and hot-swap capability.

•Gigabit Route Processor

The Gigabit Route Processor (GRP) is a high performance engine that provides the routing intelligence for the Cisco

12000Series. It is dedicated to determining the network topology and calculating the best path across the network. The

GRP has the following hardware characteristics:

•200 MHz R5000 CPU

•128MB CPU DRAM default for 2.5Gbps packet forwarding line cards or below

•256 CPU DRAM default for 10Gbps packet forwarding line cards (OC192c/STM-64c and 4OC48c/STM-16c)

•512 KB Layer 2 cache

•512 KB conﬁguration NVRAM

•8 MB boot Flash

•Two PCCMIA Type II software upgrades

•Ethernet (RJ45 and MII connectors) for Network Management access

•Local Console and modem ports (DB-25 EIA/TIA-232c)

It provides the following key functions:

•Process Interior Gateway Protocols (IGP) such as IS-IS, IGRP, EIGRP to determine the network topology

•Process External Gateway Protocols (EGP) such as BGP

•Create and maintain the routing table (up to 1 million route entries)

•Distributeand update Express Forwarding (EF) tables on the line cards and maintain copies of each line card’s EF tables

for card initialization

•General maintenance functions such as diagnostics, console support and line card monitoring

•In-band management through SNMP MIB, Telnet, BOOTP and TFTP

•Line Card

Linecards connect the Cisco 12000 Series to other devices via electrical or optical media. The line cards are designed for

thetransmission of IP packets over PPP, Frame Relay or ATMinterfaces. The features and functions of the line cards are

interface speciﬁc.

Packet over SONET/SDH (POS)

POS interfaces on the Cisco 12000 Series enable connections to other Cisco 12000 Series or other Cisco routers, such as

Cisco7500 or 7200 via optical interfaces. These interfaces can be circuits provisioned over a SONET/SDH infrastructure or

darkﬁbers (native ﬁber links) connections or wavelengths of WaveDivision Multiplexing (WDM) systems. The Cisco 12000

Series offers the following POS interfaces:

•4 OC3/STM1 port per line card

•1 OC12c/STM4c ports per line card

•4 OC12c/STM4c ports per line card

•6 Channelized T3 ports to (DS1) per line card

•1 Channelized OC12 port (to DS3) per line card