Cisco N5K-M1600 - Expansion Module - 6 Ports Troubleshooting Manual page 33

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 .
FKA timeout : 2.4 * FKA_adv_period.
The FKA_adv_period is exchanged and agreed upon with the host as in the FIP advertisement when
responding to a solicitation.
Observe the output from the following commands to confirm FKA misses:
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Solution
Sometimes when congestion is relieved, the VFC comes back up. If the symptom persists, then
additional analysis is required. The possible considerations are:
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CNA
This section includes an overview of best practices for the topology of the Converged Network Adapter
(CNA), a description of troubleshooting with host-based tools, followed by a description of common
problems and their solutions.
Best practice topology for CNA
Best Practice Topology for Direct Connected CNA
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OL-25300-01
show platform software fcoe_mgr info interface vfc<id>
show platform software fcoe_mgr event-history errors
show platform software fcoe_mgr event-history lock
show platform software fcoe_mgr event-history msgs
show platform fwm info pif ethernet <bound-ethernet-interface-id>
The host stopped sending the FKA.
The switch dropped the FKA that was received.
A unique dedicated VLAN must be configured at every converged access switch to carry traffic for
each virtual fabric (VSAN) in the SAN (for example, VLAN 1002 for VSAN 1, VLAN 1003 for
VSAN 2, and so on). If MSTP is enabled, a separate MST instance must be used for FCoE VLANs
Unified Fabric (UF) links must be configured as trunk ports. FCoE VLAN must not be configured
as a native VLAN. All FCoE VLANs must be configured as members of the UF links. This allows
it to be extendible for VF_Port trunking and VSAN management for the VFC interfaces.
UF links must be configured as spanning tree edge ports.
FCoE VLANs must not be configured as members of Ethernet links that are not designated to carry
FCoE traffic. This ensures to limit the scope of the spanning-tree protocol for FCoE VLANs to UF
links only.
If the converged access switches (in the same SAN fabric or in the other) need to be connected to
each over Ethernet links for the purposes of LAN alternate pathing, then such links must explicitly
be configured to exclude all FCoE VLANs from membership. This ensures to limit the scope of the
Spanning Tree Protocol for FCoE VLANs to UF links only.
Separate FCoE VLANs must be used for FCoE in SAN-A and SAN-B.
Cisco Nexus 5000 Series Troubleshooting Guide
CNA
2-9