Restarting A Domain; About Domain Manager Fast Restart; Enabling Domain Manager Fast Restart - Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual

Fibre Channel Domains
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m

Restarting a Domain

To restart the fabric disruptively or nondisruptively, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# fcdomain restart vsan 1
switch(config)# fcdomain restart disruptive
vsan 1

About Domain Manager Fast Restart

As of Cisco MDS SAN-OS Release 3.0(2), when a principal link fails, the domain manager must select
a new principal link. By default, the domain manager starts a build fabric (BF) phase, followed by a
principal switch selection phase. Both of these phases involve all the switches in the VSAN and together
take at least 15 seconds to complete. To reduce the time required for the domain manager to select a new
principal link, you can enable the domain manager fast restart feature.
When fast restart is enabled and a backup link is available, the domain manager needs only a few
milliseconds to select a new principal link to replace the one that failed. Also, the reconfiguration
required to select the new principal link only affects the two switches that are directly attached to the
failed link, not the entire VSAN. When a backup link is not available, the domain manager reverts to the
default behavior and starts a BF phase, followed by a principal switch selection phase. The fast restart
feature can be used in any interoperability mode.
Tip We recommend using fast restart on most fabrics, especially those with a large number of logical ports
(3200 or more), where a logical port is an instance of a physical port in a VSAN.

Enabling Domain Manager Fast Restart

To enable the domain manager fast restart feature in Cisco SAN-OS Release 3.0(2) or later, or MDS
NX-OS Release 4.1(1a) or alter, follow these steps:
Command
Step 1
switch# config t
switch(config)#
Step 2
switch(config)# fcdomain optimize fast-restart
vsan 3
switch(config)# fcdomain optimize fast-restart
vsan 7 - 10
switch(config)# no fcdomain optimize
fast-restart vsan 8
Cisco MDS 9000 Family CLI Configuration Guide
18-4
Chapter 18 Configuring Domain Parameters
Purpose
Enters configuration mode.
Forces the VSAN to reconfigure without traffic
disruption.
Forces the VSAN to reconfigure with data
traffic disruption.
Purpose
Enters configuration mode.
Enables domain manager fast restart on
VSAN 3.
Enables domain manager fast restart on the
range of VSANs from VSAN 7 to VSAN 10.
Disables (default) domain manager fast restart
on VSAN 8.
OL-18084-01, Cisco MDS NX-OS Release 4.x