Cisco Systems OL-12518-01 manual Compression Support in Cisco MDS

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Chapter 4 FCIP over IP/MPLS Core

Typical Customer Requirements

The requirements are as follows:

•FCIP transport over an optimized IP/MPLS network

•Some type of compression mechanism (software or hardware)

•Security mechanism (IPSec, encryption, and VPN networks)

•End-to-end management of FCIP traffic

Compression

The primary objective of compression is to reduce the amount of overall traffic on a particular WAN link. This is achieved when a data rate equal to the WAN link speed is compressed, thereby reducing the total amount of data on the WAN link. In this case, non-compressed storage data requires all of the 45 Mb/sec DS3 WAN connection. By enabling compression on the storage data (assuming an average of 2 to 1 compression), the effective utilization of the WAN link by storage traffic would be 22.5 Mb/sec. This allows the WAN link to be used by other IP traffic. The second objective for compression may be to carry more data over a WAN link than it is normally capable of carrying. An example of this is to compress a 90-Mbps Fibre Channel data stream and carry it over a 45-Mbps WAN link (still assuming an average of compression ratio of 2 to 1).

There are several types of compression algorithms. The most common type used in data networks is lossless data compression (LZS). This type of compression converts the original data into a compressed format that then can be restored into the original data. The service adapter modules (7600-SA-VAM, SA-VAM2) and the storage services module (MDS-IPS-8 IP) use the IP Payload Compression Protocol (IPPCP)/LZS (RFC 2395) algorithm for compressing data.

The LZS compression algorithm works by searching for redundant data strings in the input data stream and then replaces these strings with data tokens that are shorter in length than the original data. A table is built of these string matches, pointing to previous data in the input stream. The net result is that future data is compressed based on previous data. The more redundant the data in the input stream, the better the compression ratio. Conversely, the more random the data, the worse the compression ratio will be.

The compression history used by LZS is based on a sliding window of the last 2000 bytes of the input stream. When the data is transmitted, it contains both literal data and compressed tokens. Literal data are input data streams that cannot be compressed and are transmitted uncompressed. Compressed tokens are pointer offsets and data length that point to the compression history table. The remote side rebuilds the data from the compressed history table based on the pointers and length fields.

Note A full description of IPPCP and LZS are available in RFC 2395 and in ANSI X.3241-1994.

Compression Support in Cisco MDS

Both software- and hardware-based compression are supported by the Cisco MDS product line. Depending on the SAN-OS version and the hardware used, customers can determine which compression methods apply.

The software-based compression solution is available on the IPS-IP Storage Service Module for the Cisco MDS 9216/MDS 9216i fabric switch and the Cisco MDS 9500 series storage directors. This feature is available in SAN-OS version 1.3(2a) and later releases. The software-based compression is available on each of the eight IPS-8 Gigabit Ethernet ports. The number of Gigabit Ethernet ports used on the IPS does not affect the performance of the compression with this feature enabled.

Data Center High Availability Clusters Design Guide

 

OL-12518-01

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Contents A P T E R OverviewSAN Extension Through SP Network Typical Customer RequirementsCompression Support in Cisco MDS CompressionCompression Modes and Rate 2shows a comparison of the Cisco compression solutionsSecurity Cisco Compression SolutionsVPNSM-DES, 3DES MDS MPS-DES, 3DES, AES192 Cisco Encryption SolutionsWrite Acceleration Using Fcip Tape AccelerationTCP Parameters TCP OperationsTCP Window Size TCP Maximum BandwidthTCP Minimum Available Bandwidth Cisco Round Trip TimeIPS Module Cisco Fcip Cisco MDSCPE Selection-Choosing between the 9216i Multiprotocol Services ModuleQoS Requirements in Fcip Applications Synchronous ReplicationAsynchronous Replication Service Offering Scenario A-Disaster Recovery Service Offerings over FcipFcip over SP IP/MPLS Core for Disaster Recovery Solutions Service Offering Scenario B-Connecting Multiple SitesSP Mpls Service Offering Scenario C-Host-based MirroringCPE Mpls VPN CoreMpls VPN for Storage Architecture Using VRF VPNsTesting Scenarios and Results Lab Setup and TopologyTest Objectives MP BGP Configuration-PE1 VPN VRF-Specific ConfigurationsGigabit Ethernet Interface Configuration-PE2 Gigabit Ethernet Interface Configuration-PE1VRF Configuration-PE1 MP BGP Configuration-PE2Scenario 1-MDS 9216i Connection to GSR Mpls Core VRF Configuration-PE2Configuring the MTU Configuring TCP Parameters on CPE Cisco MDSThroughput Scenario 2-Latency Across the GSR Mpls CoreScenario 3-Cisco MDS 9216i Connection to Cisco 7500 PE/GSR P Scenario 5-Impact of Core Performance Scenario 4-Impact of Failover in the Core17shows the MDS Fcip and compression latency Compression Ratio Comparisons Application RequirementsConclusion Remote Tape-Backup Applications

OL-12518-01 specifications

Cisco Systems OL-12518-01, also known as the Cisco Management Services for Wireless LAN Controller, is a key component for businesses seeking to enhance their wireless networking capabilities. This product offers a comprehensive management solution designed to ensure high performance and security of wireless networks.

One of the main features of OL-12518-01 is its centralized management interface, which simplifies the deployment and operation of multiple access points across an organization. This centralized approach allows network administrators to manage all wireless devices from a single pane of glass, significantly improving operational efficiency and reducing the potential for human error.

The product is built upon various robust technologies that enhance its performance. It includes advanced features like Quality of Service (QoS) support, which prioritizes bandwidth for critical applications. This ensures that mission-critical operations run smoothly, even in environments with high user density. Furthermore, the Wireless LAN Controller supports a variety of security protocols, including WPA3, ensuring that user data and wireless networks are protected against unauthorized access.

A significant characteristic of OL-12518-01 is its scalability. As businesses grow, their network requirements can change dramatically. The Cisco Management Services solution is designed to scale easily alongside the organization’s needs, allowing for the addition of more access points and the integration of advanced features seamlessly. This adaptability makes it suitable for both small businesses and large enterprises, ensuring consistent wireless connectivity across diverse spaces.

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In summary, Cisco Systems OL-12518-01 is a powerful wireless LAN management solution that combines centralized management, advanced security features, scalability, and comprehensive analytics. These characteristics make it an ideal choice for organizations aiming to optimize their wireless networking performance while ensuring security and reliability in their operations. By investing in OL-12518-01, businesses can achieve a robust wireless infrastructure that meets their current and future needs.
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