Cisco N5K-M1600 - Expansion Module - 6 Ports Troubleshooting Manual page 29

Chapter 2 Troubleshooting FCoE Issues
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 .
Check for the same values for the FCoE Data Center Bridging and the Type-Length-Value on the
•
host CNA software.
Ensure that the VSAN trunk protocol has been enabled.
•
Use the configuration terminal command to enter into configuration mode and use the trunk
protocol enable command to enable the trunking protocol.
Solution Summary
Review every feature negotiation result.
•
Use the show system internal dcbx info interface ethernet 1/4 command.
(For releases earlier than 4.2(1)N1, use the sh platform software dcbx internal info interface
ethernet x/y command.)
Example:
switch# show system internal dcbx info interface ethernet 1/4
feature type 3 sub_type 0
feature state variables: oper_version 0 error 0 oper_mode 1 feature_seq_no 0
remote_feature_tlv_present 1
remote_tlv_not_present_notification_sent 0 remote_tlv_aged_out 0
feature register params max_version 0, enable 1, willing 0 advertise 1,
disruptive_error 0 mts_addr_node
0x101mts_addr_sap 0x1e5
Desired config cfg length: 1 data bytes:08
Operating config cfg length: 1 data bytes:08
Errors
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Operating configuration
•
DCBX feature might not be working because:
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• An option exists to force PFC mode on an interface.
Use the inerfacet ethernet 1/21 command and the priority-flow-control mode command to force
the PFC mode.
Example:
switch(config)# int eth1/21
switch(config-if)# priority-flow-control mode ?
OL-25300-01
Indicates negotiation error.
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Never expected to happen when connected to CNA.
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– When two Nexus 5000 switches are connected back-to-back, and if PFC is enabled on different
CoS values, then a negotiation error can occur.
Indicates negotiation result.
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– Absence of operating configuration indicates that the peer does not support the DCBX TLV or
that there is a negotiation error.
The remote_feature_tlv_present message indicates whether the remote peer supports this
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feature TLV or not.
Peer does not support the LLDP Protocol.
–
Peer does not support the DCBX Protocol.
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– Peer does not support some DCBX TLVs.
– Unexpected DCBX negotiation result.
Cisco Nexus 5000 Series Troubleshooting Guide
Data Center Bridging
2-5