Cisco Nexus 5000 Series Switch Fabric Manager Software Configuration Guide, NX-OS 4.0 (OL-16598-01, June 2008)

CHAPTER
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22-1
Nexus 5000 Series Switch Fabric Manager Software Configuration Guide
OL-16598-01
22
Advanced Features and Concepts
This chapter describes the advanced Fibre Channel features provided in Nexus 5000 Series switches. It
includes the following sections:
• Fibre Channel Timeout Values, page 22-1
• World Wide Names, page 22-5
• FC ID Allocation for HBAs, page 22-6
• Switch Interoperability, page 22-7
• Default Settings, page 22-12
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 22-2
• Timer Configuration Per-VSAN, page 22-3
• About fctimer Distribution, page 22-4
• Enabling or Disabling fctimer Distribution, page 22-4
• Database Merge Guidelines, page 22-4