When we deal with Cisco / Brocade Fabric switches ,we come across Domains .
What exactly is the purpose of a domain in a switch and how many Domains can we 've ?
Appreciate if some one can give some insight. Thanks in advance!
Like everything else FC, it's complicated. Here's an intro article to start with.
They're something akin to subnets; a mechanism FC uses to route packets to the correct hardware.
Chris has answered the 'what' question, the 'how many' varies from device to device but for Cisco MDS's running NX-OS 5.0 the domain can be from 1 to 239, so 239 per switch/domain.