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

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Nexus 5000 Series Switch Fabric Manager Software Configuration Guide
OL-16598-01
Chapter 22 Advanced Features and Concepts
Fibre Channel Timeout Values
Step 3 Click Apply to save these changes.
About fctimer Distribution
You can enable per-VSAN fctimer fabric distribution for all Cisco SAN switches in the fabric. When you
perform fctimer configurations, and distribution is enabled, that configuration is distributed to all the
switches in the fabric.
You automatically acquire a fabric-wide lock when you enter the first configuration command after you
enabled distribution in a switch. The fctimer application uses the effective and pending database model
to store or commit the commands based on your configuration.
See Chapter 7, “Using Cisco Fabric Services,” for more information on the CFS application.
Enabling or Disabling fctimer Distribution
To enable and distribute fctimer configuration changes using Device Manager, perform this task:
Step 1 Choose FC > Advanced > VSAN Timers.
You see the VSANs Timer dialog box as shown in Figure 22-3.
Step 2 Fill in the timer values that you want to configure.
Step 3 Click Apply to save these changes.
Step 4 Choose commit from the CFS drop-down list to distribute these changes or choose abort from the CFS
drop-down list to discard any unsaved changes.
When you commit the fctimer configuration changes, the effective database is overwritten by the
configuration changes in the pending database and all the switches in the fabric receive the same
configuration. When you commit the fctimer configuration changes without implementing the session
feature, the fctimer configurations are distributed to all the switches in the physical fabric.
Database Merge Guidelines
When merging two fabrics, follow these guidelines:
• Be aware of the following merge conditions:
– The merge protocol is not implemented for distribution of the fctimer values. You must
manually merge the fctimer values when a fabric is merged.
– The per-VSAN fctimer configuration is distributed in the physical fabric.
– The fctimer configuration is only applied to those switches containing the VSAN with a
modified fctimer value.
– The global fctimer values are not distributed.
• Do not configure global timer values when distribution is enabled.