what changed. Domain format SW-RSCNs can cause problems with some non-Cisco MDS switches (refer
to the ).
To suppress the transmission of these SW RSCNs over an ISL, follow these steps:
Step 1 switch# config terminal
switch(config)#
Enters configuration mode.
Step 2 switch(config)# rscn suppress domain-swrscn vsan 105
Suppresses transmission of domain format SW-RSCNs for VSAN 105.
You cannot suppress transmission of port address or area address format RSCNs.
Note
Coalesced SW-RSCN
In order to improve the performance of the Fibre Channel protocols on the Cisco MDS 9000 switch, SW-RSCNs
are delayed, collected and sent as a single coalesced SW-RSCN to all the switches in the fabric in a single
Fibre Channel exchange.
Enabling Coalesced SW-RSCNs
Restrictions
• All the switches in the fabric should be running Cisco MDS 6.2(7) and above.
• This feature does not have interoperability with non-Cisco MDS switches.
To enable the coalesced SW-RSCNs, follow these step:
Step 1 switch# config terminal
Enters configuration mode.
Step 2 switch(config)# rscn coalesce swrscn vsan 1
switch(config)#
Enables coalescing of Switch Registered State Change Notification (SWRSCN) in VSAN 1. The default delay is 500
milliseconds.
Step 3 switch(config)# rscn coalesce swrscn vsan 1 delay 800
switch(config)#
Enables coalescing of Switch Registered State Change Notification (SWRSCN) in VSAN 1. Delays the SW-RSCNs
maximum by 800 milliseconds.
Cisco MDS 9000 Series Fabric Configuration Guide, Release 8.x
231
Managing FLOGI, Name Server, FDMI, and RSCN Databases
Coalesced SW-RSCN
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