Cisco Nexus 5000 Series - Advanced Fibre Channel Features and Concepts; Fibre Channel Timeout Values

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Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
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Advanced Fibre Channel Features and Concepts
This chapter describes the advanced Fibre Channel features provided in Cisco Nexus 5000 Series
switches. It includes the following sections:
• Fibre Channel Timeout Values, page 1-1
• World Wide Names, page 1-5
• FC ID Allocation for HBAs, page 1-7
• Switch Interoperability, page 1-9
• Default Settings, page 1-15
Fibre Channel Timeout Values
You can modify Fibre Channel protocol-related timer values for the switch by configuring the following
timeout values (TOVs):
• Distributed services TOV (D_S_TOV)—The valid range is from 5,000 to 10,000 milliseconds. The
default is 5,000 milliseconds.
• Error detect TOV (E_D_TOV)—The valid range is from 1,000 to 10,000 milliseconds. The default
is 2,000 milliseconds. This value is matched with the other end during port initialization.
• Resource allocation TOV (R_A_TOV)—The valid range is from 5,000 to 10,000 milliseconds. The
default is 10,000 milliseconds. This value is matched with the other end during port initialization.
Note The fabric stability TOV (F_S_TOV) constant cannot be configured.
This section includes the following topics:
• Timer Configuration Across All VSANs, page 1-2
• Timer Configuration Per-VSAN, page 1-2
• About fctimer Distribution, page 1-3
• Enabling or Disabling fctimer Distribution, page 1-3
• Committing fctimer Changes, page 1-3
• Discarding fctimer Changes, page 1-4
• Fabric Lock Override, page 1-4