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Introducing the Cache Engine

Introducing the Cache Engine

This chapter describes the Cisco Cache Engine, its specifications, and considerations for using the system. Before you install the Cache Engine, take time to carefully plan the placement of the Cache Engine on your networks. This helps ensure that you receive the maximum benefit of caching web traffic.

Overview

The Cache Engine is a special-purpose hardware and software carrier-class solution that has been designed from the ground up as a loosely coupled, multinode network system optimized to provide robust shared network caching.

The Cache Engine works with routers running Cisco IOS software with the Web Cache Communication Protocol (WCCP). WCCP redirects Hypertext Transfer Protocol (HTTP) traffic to a Cache Engine; the Cache Engine then manages the web request. See Appendix B, "Web Cache Communication Protocol Version 1," for more information on WCCP, Version 1. See Appendix C, "Web Cache Communication Protocol Version 2," for more information on WCCP, Version 2.

The Cache Engine works in tandem with a router to handle web traffic. This traffic includes user requests to view pages and graphics (objects) on World Wide Web servers, whether internal or external to your network, and the replies to
those requests.

When a user requests an object from a web server, the router first sends the request to a Cache Engine. If the Cache Engine has a copy of the requested object in storage, the Cache Engine sends the user the object. Otherwise, the Cache Engine gets the requested objects from the web server, stores a copy of the objects (caches them), and simultaneously forwards the objects on to the user.

By caching web objects in this manner, the Cache Engine can speed the satisfaction of user requests if more than one user wants to access the same objects. This also reduces the amount of traffic between your network and the Internet, potentially improving your overall network performance and optimizing your bandwidth usage.

Cache Engine Specifications

Table 1-1 lists the specifications of the Cache Engine.


Table 1-1: Cisco Cache Engine Specifications
Specifications Model 505 Model 550 Model 570

Hard disk storage

1 9.1-GB Ultra2 LVD SCSI hard drive1

2 9.1-GB Ultra2 LVD SCSI hard drives

2 18-GB Ultra2 LVD SCSI hard drives

Memory

8-MB Flash memory

128-MB SDRAM

256-KB EPROM

512-KB L2 cache

8-MB Flash memory

256-MB SDRAM

256-KB EPROM

512-KB L2 cache

8-MB Flash memory

384-MB SDRAM

256-KB EPROM

512-KB L2 cache

CPU

266 MHz

366 MHz

375 MHz

Ethernet controller

Intel 82588

Intel 82588

Intel 82588

Dimensions

Height: 1.72 inches (43.69 mm)

Width: 17.5 inches (444.50 mm)

Depth: 14.1 inches (358.14 mm)

Height: 1.72 inches (43.69 mm)

Width: 17.5 inches (444.50 mm)

Depth: 14.1 inches (358.14 mm)

Height: 1.72 inches (43.69 mm)

Width: 17.5 inches (444.50 mm)

Depth: 14.1 inches (358.14 mm)

Weight

11.2 pounds (5.08 kg)

12.5 pounds (5.67 kg)

12.5 pounds (5.67 kg)

Power

  • Universal input: 100-120 VAC
    200-240 VAC

  • Freqency:
    50-60 Hz

  • Maximum power: 65 watts

  • Universal input: 100-120 VAC
    200-240 VAC

  • Freqency:
    50-60 Hz

  • Maximum power: 65 watts

  • Universal input: 100-120 VAC
    200-240 VAC

  • Freqency:
    50-60 Hz

  • Maximum power: 65 watts

Current

  • 120-VAC input, with PFC (power factor correction) 1.05A

  • 230-VAC input, with PFC (power factor correction) 0.51A

  • 120-VAC input, with PFC (power factor correction) 1.05A

  • 230-VAC input, with PFC (power factor correction) 0.51A

  • 120-VAC input, with PFC (power factor correction) 1.05A

  • 230-VAC input, with PFC (power factor correction) 0.51A

Connectors

Console: 1 RJ-45 connector

Network: 2 10/100 BaseTX Ethernet RJ-45 connectors (MDI)


External SCSI: 68-pin high-density connector (Ultra2 LVD)


Support for a maximum of 80 MBps data transfer

Console: 1 RJ-45 connector

Network: 2 10/100 BaseTX Ethernet RJ-45 connectors (MDI)


External SCSI: 68-pin high-density connector (Ultra2 LVD)


Support for a maximum of 80 MBps data transfer

Console: 1 RJ-45 connector

Network: 2 10/100 BaseTX Ethernet RJ-45 connectors (MDI)


External SCSI: 68-pin high-density connector (Ultra2 LVD)


Support for a maximum of 80 MBps data transfer

Maximum station-to-station cabling distances

10/100BaseTX Ethernet: Category 5 UTP: 328 ft (100 m)

SCSI Ultra2 LVD: 12 m maximum

10/100BaseTX Ethernet: Category 5 UTP: 328 ft (100 m)

SCSI Ultra2 LVD: 12 m maximum

10/100BaseTX Ethernet: Category 5 UTP: 328 ft (100 m)

SCSI Ultra2 LVD: 12 m maximum

LEDs

Power

System

LINK (2)

100 Mbps (2)

Drive 0

Drive 1

SW Status (4)

Power

System

LINK (2)

100 Mbps (2)

Drive 0

Drive 1

SW Status (4)

Power

System

LINK (2)

100 Mbps (2)

Drive 0

Drive 1

SW Status (4)

Agency approvals

FCC Class A (47 CFR Part 15)

EN 55022A Class B on shielded UTP

VCCI Class A

UL 1950

CSA-C22.2 No. 950

IEC 60950

EN 60950

CE Mark

FCC Class A (47 CFR Part 15)

EN 55022A Class B on shielded UTP

VCCI Class A

UL 1950

CSA-C22.2 No. 950

IEC 60950

EN 60950

CE Mark

FCC Class A (47 CFR Part 15)

EN 55022A Class B on shielded UTP

VCCI Class A

UL 1950

CSA-C22.2 No. 950

IEC 60950

EN 60950

CE Mark

Placement

Rack-mounted, mid, front, or back (standard 19-inch and 23-inch racks)

Rack-mounted, mid, front, or back (standard 19-inch and 23-inch racks)

Rack-mounted, mid, front, or back (standard 19-inch and 23-inch racks)

Temperature

Operating: 41 to 104°F (5 to 40°C)

Nonoperating: -13 to 158°F (-25 to 70°C)

Operating: 41 to 104°F (5 to 40°C)

Nonoperating: -13 to 158°F (-25 to 70°C)

Operating: 41 to 104°F (5 to 40°C)

Nonoperating: -13 to 158°F (-25 to 70°C)

Operating humidity

5 to 95%, noncondensing

5 to 95%, noncondensing

5 to 95%, noncondensing

1One additional 9.1-GB Ultra2 LVD SCSI disk drive can be added to the Model 505 to increase storage.


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Posted: Tue Jun 5 19:00:46 PDT 2001
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