For more details, please see ourCookie Policy.

Fibre Channel (SAN)

Posts: 0

Different FOS levels on a Fabric



We currently have a mixture of 5300, 5100 , 4100 and blade switches on both our fabrics.

I have recently upgraded the FOS level of the 5300 to a 6.3.2e while all the other switches are on 6.1.1d

Are there any issues running switches on the same fabric at different OS levels?

Is it best practise to run same level.


I cant find any documentation with specifics.



Frequent Contributor
Posts: 80
Registered: ‎01-28-2010

Re: Different FOS levels on a Fabric

[ Edited ]

we( more i) run two fabrics (~3000ports) that consists of different generations brocade switches (4xxx, 5xxx, 6xxx 8510-8, 7800) with different fos versions 6.4.3d, 7.0, 7.01, 7.1.1 and 7.2something.

 from my work with brocade equipment there seems not to be any issue, or might haven been lucky the past 10 years or possibly doing everything right, hehehe, nevertheless there are some points to consider when it comes to features like bottleneckmon that has been introduced in fos 6.3.0 or flow monitor that has been introduced in fos 7.2. both feathers can come in quite handy when it comes to troubleshooting issues on the san.

 maybe the other guys in this forum can list additional features added in the fos versions, i havent mentioned.


ah one more thing you might wanna have a look on the link


or in short to quote my post


doges wrote:

page 343


Best practices for zoning
The following are recommendations for using zoning:
Always zone using the switch with
the latest Fabric OS release level.
Switches with earlier Fabric OS versions do not have the capability to view all the functionality
that a newer Fabric OS version provides, as fu
nctionality is backwards-compatible but not
Zone using the core switch versus an edge switch.
Zone using a Backbone rather than a switch.
A Backbone has more resources to hand
le zoning changes and implementations.


i knew there are two documents on this



i know this is about how to design a san and such, but its never bad to rethink your current design and see if there´s room for improvment, atm i am considering moving all the backend san traffic, that would be -> storagebased mirroring and storage virtualization traffic away from the production data traffic onto a new hardware, but thats just an idea


how do you monitor your san, what tools do you use?

Join the Broadcom Support Community

Get quick and easy access to valuable resources across the Broadcom Community Network.