HP Cisco Nexus 5000 Cisco MDS 9000 Family CLI Configuration Guide - Release 4. - Page 1253

Chapter 51 Monitoring Network Traffic Using SPAN Monitoring Traffic Using Fibre Channel Analyzers Send documentation comments to [email protected] Figure 51-5 Fibre Channel Analyzer Usage Without SPAN FC Analyzer usage without SPAN Cisco MDS 9000 switch fc1/1 Storage device Cisco MDS 9000 switch fc1/1 RX =TX 1 FC Analyzer 2 TX RX Storage device 85651 This type of connection has the following limitations: • It requires you to physically insert the FC analyzer between the two network devices. • It disrupts traffic when the Fibre Channel analyzer is physically connected. • The analyzer captures data only on the Rx links in both port 1 and port 2. Port 1 captures traffic exiting interface fc1/1 and port 2 captures ingress traffic into interface fc1/1. With SPAN Using SPAN you can capture the same traffic scenario shown in Figure 51-5 without any traffic disruption. The Fibre Channel analyzer uses the ingress (Rx) link at port 1 to capture all the frames going out of the interface fc1/1. It uses the ingress link at port 2 to capture all the ingress traffic on interface fc1/1. Using SPAN you can monitor ingress traffic on fc1/1 at SD port fc2/2 and egress traffic on SD port fc2/1. This traffic is seamlessly captured by the FC analyzer as shown in Figure 51-6. OL-18084-01, Cisco MDS NX-OS Release 4.x Cisco MDS 9000 Family CLI Configuration Guide 51-13