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60-11
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 60 Monitoring Network Traffic Using SPAN
Monitoring Traffic Using Fibre Channel Analyzers
Figure 60-8 Fibre Channel Analyzer Usage Without SPAN
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 60-8 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 60-9.
Cisco
MDS 9000
switch
Cisco
MDS 9000
switch
fc1/1
fc1/1
RX
TX RX
=TX
1
2
FC Analyzer
Storage
device
Storage
device
FC Analyzer usage without SPAN
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