Configuring Span For Generation 2 Fabric Switches - HP Cisco MDS 9020 - Fabric Switch Configuration Manual

Chapter 52 Monitoring Network Traffic Using SPAN
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
To configure a SPAN filter, follow these steps:
Command
Step 1
switch# config t
Step 2
switch(config)# span session 1
switch(config-span)#
Step 3
switch(config-span)# source interface fc9/1 tx
switch(config-span)# source filter vsan 1-2
switch(config-span)# source interface fc7/1 rx
To configure a span drop-threshold for a SPAN session, follow these steps::
Command
Step 1
switch# config t
Step 2
switch(config)# span drop-threshold 15
switch(config-span)#
By default, SPAN frames are dropped if the sum of the bandwidth of the source interfaces exceed the
Caution
bandwidth of the destination port. With a higher value, the SPAN traffic has a higher probability of
reaching the SPAN destination port instead of being dropped at the expense of data traffic throughput.
The span drop-threshold can be changed only if no span sessions are currently active on the switch.
Caution
Caution By default, SPAN frames are dropped if the sum of the bandwidth of the source interfaces exceed the
bandwidth of the destination port. With a higher value, the SPAN traffic has a higher probability of
reaching the SPAN destination port instead of being dropped at the expense of data traffic throughput.
The span drop-threshold can be changed only if no span sessions are currently active on the switch.
Caution

Configuring SPAN for Generation 2 Fabric Switches

Cisco Generation 2 Fabric Switches (such as MDS 9124) support SPAN sessions in both directions, Rx
and Tx.
Note While using Generation 2 Fabric Switches, you cannot create an additional active SPAN session when
you already have one.
The following example shows how to configure SPAN sessions for the ingress direction for this switch.
OL-16184-01, Cisco MDS SAN-OS Release 3.x
Purpose
Enters configuration mode.
Configures the specified session (1).
Configures the source fc9/1 interface in the
egress (Tx) direction.
Configures VSANs 1 and 2 as session filters.
Configures the source fc7/1 interface in the
ingress (Rx) direction.
Purpose
Enters configuration mode.
Configures the SPAN drop-threshold.
Cisco MDS 9000 Family CLI Configuration Guide
Configuring SPAN
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