Cisco N5K-M1600 - Expansion Module - 6 Ports Troubleshooting Manual page 19

Chapter 1 Troubleshooting Overview
S e n d d o c u m e n t c o m m e n t s t o n e x u s 5 k - d o c f e e d b a c k @ c i s c o . c o m .
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Monitor Caveats
Limitations of Nexus 5000 SPAN CoS values are not preserved at the monitor (span) destination.
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Configuration limitations: VLAN or port-channel cannot be configured as egress source
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SPAN Configuration
Example:
switch(config)# interface fc3/2
switch(config-if)# switchport mode sd
switch(config-if)# switchport speed 1000
switch(config-if)# no shut
switch(config-if)# exit
switch(config)# monitor session 1
switch(config-monitor)# source interface fc3/1 tx
switch(config-monitor)# source interface fc3/1 rx
switch(config-monitor)# destination interface fc3/2
Verifying the SPAN Session
Example:
switch# show monitor session
SESSION
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1
OL-25300-01
Does not participate in spanning tree while the SPAN session is active.
Is excluded from the source list and is not monitored if it belongs to a source VLAN of any SPAN
session.
Receives copies of sent and received traffic for all monitored source ports. If a destination port is
oversubscribed, it can become congested. This congestion can affect traffic forwarding on one or
more of the source ports.
Packets coming in on the monitor source with an unknown VLAN tag are spanned ouf with a 0
VLAN tag (priority tag).
For Ethernet destination, the monitor session is up only if the destination port is configured as switch
port monitor.
Out of 18 configurable sessions, only two are active (up state). The rest are in down state (hardware
resource unavailable).
VLAN or port channel cannot be a monitor destination.
Only two egress sources supported.
Only one destination port can be configured for a session.
DS-PAA
STATE REASON
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up The session is up
Nexus 5020
FC3/1
FC3/2
DESCRIPTION
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Cisco Nexus 5000 Series Troubleshooting Guide
Fabric Manager Tools and CLI Commands
1-11