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Table 6 Catalyst 8500 ATM Trafﬁc Classes

Trafﬁc Classes Available Today Typical Use

Constant Bit Rate (CBR) Typically used for telephony or legacy, site-to-site videoconferencing applications, ATM circuit emulation

service

Real-Time Variable Bit Rate (RT-VBR) Designed for delay- and jitter-sensitive applications, such as many-to-many desktop videoconferencing

applications

Non-Real-Time Variable Bit Rate (NRT-VBR) Designed for delay- and jitter-tolerant, but bandwidth-hungry applications, such as one-to-many video

broadcasts

Available Bit Rate (ABR) + Minimum Cell Rate (MCR) Best effort with congestion feedback notiﬁcation plus an optionally deﬁned minimum bandwidth, typically

used in the WAN

Unspeciﬁed Bit Rate (UBR) + MCR Cisco-unique trafﬁc class for best-effort trafﬁc with a speciﬁed minimum bandwidth, typically used in the

LAN for strategic resources or applications or in the WAN for an ATM committed information rate

(CIR)-like service

Unspeciﬁed Bit Rate (UBR) Most legacy data applications using fair best-effort service

Table 7 Catalyst 8500 Features and Beneﬁts Summary

Feature Comment/Description Beneﬁt

High Performance, High Scalability

Wire-Speed, Low-Latency Switching for IP, IPX, IP

Multicast, and Layer 2 Bridging

• Catalyst 8510—6 million pps, 10G nonblocking

switching fabric

• Catalyst 8540—24 million pps, 40G nonblocking

switching fabric

• Nonblocking performance means that the total

switching capacity of each Catalyst 8500 series

platform is greater than what is needed to switch the

total trafﬁc load across all the respective interfaces

simultaneously, even if all the trafﬁc is to be routed.

Cisco Express Forwarding (CEF) • Same switching paradigm used to scale Cisco 7500

and GSR 12000 series routers by isolating control

plane (routing) and data plane (switching)

• CEF, designed originally to solve Internet scalability

issues, provides needed scalability to emerging

enterprise intranets and applications.

Hardware-Based Routing Tables on Each Port • Cisco’s highly optimized lookup algorithm, the FIB,

is downloaded to the ASICs on each line card

• This optimized algorithm, together with the CEF

architecture, ensures that the route processor is free

to keep the network topology consistent and to

converge quickly in the event of topology changes or

link failures.

SRP/MSRP in the Catalyst 8510 Is R4600 RISC-Based

RP/MRP in the Catalyst 8540 Is R5000 RISC-Based

• 100-MHz clock speed

• 200-MHz clock speed

• High performance meets requirements for quick

convergence of routing protocols upon topology

changes or link failures and for running resource and

policy admission control, and so on.

Cisco IOS Routing Support

Cisco IOS IP Routing Support • OSPF

• EIGRP

• IGRP

• RIP

• RIP-2

• CIDR support

• VLSM

• IP multicast: PIM—sparse and dense mode and

DVMRP interoperability support

• Consistent LAN and WAN implementation

• Fast convergence around failures with OSPF and

EIGRP

• Stable, time-tested, and proven industry-standard

routing protocol feature set

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