Cisco OL-12518-01 - Manual

Cisco OL-12518-01

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Table of Contents:

  • Page 2 – Typical Customer Requirements
  • Page 3 – Compression; Compression Support in Cisco MDS
  • Page 4 – Compression Modes and Rate
  • Page 5 – Security
  • Page 6 – Cisco Encryption Solutions
  • Page 7 – Write Acceleration; Using FCIP Tape Acceleration
  • Page 8 – FCIP; TCP Operations; TCP Parameters
  • Page 9 – TCP Window Size; TCP Minimum Available Bandwidth
  • Page 10 – Round Trip Time; IPS Module
  • Page 11 – Cisco FCIP
  • Page 12 – Multiprotocol Services Module
  • Page 13 – QoS Requirements in FCIP
  • Page 14 – Applications; Synchronous Replication
  • Page 15 – Service Offerings over FCIP; Service Offering Scenario A—Disaster Recovery
  • Page 16 – Service Offering Scenario B—Connecting Multiple Sites
  • Page 17 – Service Offering Scenario C—Host-based Mirroring
  • Page 18 – MPLS VPN Core
  • Page 19 – Using VRF VPNs
  • Page 20 – Testing Scenarios and Results; Test Objectives
  • Page 21 – VPN VRF—Specific Configurations; MP BGP Configuration—PE1
  • Page 22 – Gigabit Ethernet Interface Configuration—PE1; Gigabit Ethernet Interface Configuration—PE2
  • Page 23 – VRF Configuration—; Scenario 1—MDS 9216i Connection to GSR MPLS Core
  • Page 24 – Configuring TCP Parameters on CPE (Cisco MDS 9216); Configuring the MTU
  • Page 25 – Scenario 2—Latency Across the GSR MPLS Core
  • Page 27 – Scenario 4—Impact of Failover in the Core; Scenario 5—Impact of Core Performance
  • Page 28 – Scenario 6—Impact of Compression on CPE (Cisco 9216i) Performance
  • Page 29 – Application Requirements
  • Page 30 – Remote Tape-Backup Applications; Conclusion
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C H A P T E R

4-1

Data Center High Availability Clusters Design Guide

OL-12518-01

4

FCIP over IP/MPLS Core

This chapter discusses the transport of Fibre Channel over IP (FCIP) over IP/Multiprotocol Label
Switching (MPLS) networks and addresses the network requirements from a service provider (SP)
perspective. This chapter also describes service architectures and storage service offerings using FCIP
as a primary storage transport mechanism.

Overview

Storage extension solutions offer connectivity between disparate storage “islands,” and promote
transport solutions that are specifically geared towards carrying storage area network (SAN) protocols
over WAN and MAN networks. This emerging demand is providing a new opportunity for carriers. SPs
can now deliver profitable SAN extension services over their existing optical (Synchronous Optical
Network [SONET]/Synchronous Digital Hierarchy [SDH] and Dense Wavelength Division Multiplexing
[DWDM]) or IP infrastructure. DWDM networks are ideal for high-bandwidth, highly resilient networks
and are typically deployed within metro areas. Transporting storage traffic over the existing
SONET/SDH infrastructure allows SPs to maximize the use of their existing SONET/SDH ring
deployments. Some applications do not mandate stringent requirements offered by optical networks.
These applications can be easily transported over IP networks using FCIP interfaces. The obvious
advantage of transporting storage over IP is the ubiquitous nature of IP.

Disk replication is the primary type of application that runs over an extended SAN network for business
continuance or disaster recovery. The two main types of disk replication are array-based (provided by
EMC

2

SRDF, Hitachi True Copy, IBM PPRC XD, or HP DRM, and host-based (for example, Veritas

Volume Replicator). Both disk replication types run in synchronous and asynchronous modes. In
synchronous mode, an acknowledgement of a host-disk write is not sent until a copy of the data to the
remote array is completed. In asynchronous mode, host-disk writes are acknowledged before the copy
of the data to the remote array is completed.

Applications that use synchronous replication are highly sensitive to response delays and might not work
with slow-speed or high-latency links. It is important to consider the network requirements carefully
when deploying FCIP in a synchronous implementation. Asynchronous deployments of FCIP are
recommended in networks with latency or congestion issues. With FCIP, Fibre Channel SAN can be
extended anywhere an IP network exists and the required bandwidth is available. FCIP can be extended
over metro, campus, or intercontinental distances using MPLS networks. FCIP may be an ideal choice
for intercontinental and coast-to-coast extension of SAN.

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Summary

Page 2 - Typical Customer Requirements

4-2 Data Center High Availability Clusters Design Guide OL-12518-01 Chapter 4 FCIP over IP/MPLS Core Typical Customer Requirements Typical Customer Requirements Small-to-medium businesses (SMBs) represent about 90 percent of all companies in the United States. These companies typically employ a few ...

Page 3 - Compression; Compression Support in Cisco MDS

4-3 Data Center High Availability Clusters Design Guide OL-12518-01 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 (IPS...

Page 4 - Compression Modes and Rate

4-4 Data Center High Availability Clusters Design Guide OL-12518-01 Chapter 4 FCIP over IP/MPLS Core Typical Customer Requirements Hardware-based compression is available with SAN-OS version 2.0 and with new hardware (MDS 9216i/MLS14/2). Compression is applied per FCIP interface (tunnel) with a vari...

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