MDS : RSCN delay for up to 2000msec - how does it really work ?

[pknurek]

I was wondering about how Cisco MDS uses RSCN delay

As such my quesion is :

When I configure RSCN delay for 2sec would following events take place or I am mistaken

1. RSCN created by switch and send to all other switches (due to target going OFFLINE)
2. RSCN delivered to end-node registered/zoned. No delay here is expected - correct ?
3. _SHALL ANOTHER RSCN BE ON WAY TO END-NODE THAT RECIVED PREVIOUS RSCN – DELAY IT_ <- is it the way it works ?
4. After delay deliver

Looking forward to hear from you.

pk

[dakester]

Hi PK,

What is the big picture?  Why are you interested in delaying an RSCN?

This is the only command I could find that involved delaying an RSCN.
rscn coalesce swrscn vsan 1 delay 800

It works like this,

A linecard or switch or switches are reloaded and 100's or 1000's of RSCN's need to be sent to adjacent switches.
The switch collects them for the configured delay (500 to 2000 ms), then sends them to adjacent switches as bulk RSCNs.
The receiving switch will also delay and coalesce swrscns.
I did not find anything definite on regular N_port rscns (non-swrscns) delay (Some T11 documents said regular rscns should not be delayed more than 2 seconds.) nor I did not see an option to delay regular rscns in NX-OS.