04-08-2013 01:10 PM
Hey folks, we have a set of brocades that are 4GB. We recently purchased two new brocades that are capable of 8GB.
We want to merge the two via an ISL but we are not sure how this will impact the speeds.
If we do an ISL will the 8GB capable switches be only able to operate the 4GB so that all speeds are the consistent?
04-08-2013 02:12 PM
Greetings federico.arismendi. Unless you have configured a fixed speed, Brocade switches will auto-negotiate the port speed. In this case, 4 Gb. You can refer to the "port login" section of the FOS Admin Guide for a description of the process.
04-08-2013 02:36 PM
To preview the port speed, you can use portcfgshow: http://www.brocade.com/downloads/documents/html_pr
You can also use switchshow (specifically look for 'speed'): http://www.brocade.com/downloads/documents/html_pr
Please feel free to ask any additional follow up questions you may have.
04-09-2013 04:50 AM
Great, thank you.
So if I configure the port speed to 8GB on the 2 new switches I can merge two sets of switches and half will run at 4GB (old ones) and the others at 8GB (new ones)?
04-09-2013 04:57 AM
To connect a 4GB switch to a 8GB switch, you should force the speed to 4G in both ends.
To connect two 8G switchs, you should force the speed to 8G in both ends of the ISL.
YOu can also set everything to Auto-negotiate and the ISL will stablish at the highest supported speed in both ends, but I personally recommend to fix the speed manually.
04-09-2013 05:03 AM
Thanks felipon that was the answer I was looking for. I was basically asking if I could take advantage of the new 8GB switch speed when I we do an ISL to existing 4GB switches. What I am hearing is that it is not possible. All switches in an ISL must operate at the same speed that is supported across all switches. Correct?
04-09-2013 05:37 AM
--->>>So if I configure the port speed to 8GB on the 2 new switches I can merge two sets of switches and half will run at 4GB (old ones) and the others at 8GB (new ones)?
Speed is a Port, and have nothing to do with Zoning.
Zoning is just a part of config.