Brocade Flow Vision Administrators Guide (Supporting Fabric OS v7.3.0) - Manual (Page 40)

NOTE
You cannot create a learned flow in a trunk group.
3. Enter flow --show flow_name -feature monitor to view the Flow Monitor statistical data for the
entire trunk group.
NOTE
The accumulated Flow Monitor statistical data for the entire trunk group is stored on the master
port. If the master port changes, the data is transferred to the new master port. To view this data,
you must run the flow --show command on a flow that is defined using the master port. Flow
statistics are not displayed for slave trunk ports.
The following example displays the trunked ports and then creates four flows,
one for each member of the trunk group identified by the switchshow
command.
switch:admin> switchshow
24 24 021800 id N16 Online FC E-Port 10:00:00:05:33:e5:3c:d4 "Odin" (downstream)(Trunk master)
25 25 021900 id N16 Online FC E-Port (Trunk port, master is Port 24)
26 26 021a00 id N16 Online FC E-Port (Trunk port, master is Port 24)
27 27 021b00 id N16 Online FC E-Port (Trunk port, master is Port 24)
switch:admin> flow -create f1 -feature monitor -egrport 24 -srcdev 022b00 -dstdev 033a00
switch:admin> flow -create f2 -feature monitor -egrport 25 -srcdev 022b00 -dstdev 033a00
switch:admin> flow -create f3 -feature monitor -egrport 26 -srcdev 022b00 -dstdev 033a00
switch:admin> flow -create f4 -feature monitor -egrport 27 -srcdev 022b00 -dstdev 033a00
Monitoring Fibre Channel routed fabrics
When you are monitoring Fibre Channel-routed fabrics, you should keep the following points in mind:
• When monitoring a FC-routed fabric, you may find it simpler to use port WWNs rather than proxy
IDs in your flow definitions. This is because you do not need to locate and map the proxy IDs for the
actual source and destination devices.
• When creating flow monitors on EX_Ports, you can use either a WWN or a Fibre Channel ID (FCID)
for the source device (srcdev) and destination device (dstdev).
• Inter-Fabric Link (IFL) flows can be monitored only on 16 Gbps-capable EX_Ports in a Fibre
Channel router.
• IFL flows are not supported on E_Ports or F_Ports.
• Even though a flow definition is always created in the backbone fabric, the perspective of the flow is
from the edge fabric.
Monitoring FC router fabrics using port WWNs
The following figures and their descriptions illustrate how port IDs are assigned in Fibre Channel router
fabrics using World Wide Names (WWNs). Use the flow --control -deviceidmode wwn command to
set the mode to WWN.
The following figure identifies the physical devices as A, B, and C, and shows that they have the port
WWNs a, b, and c, respectively.
Monitoring Fibre Channel routed fabrics
40 Flow Vision Administrators Guide
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