01-30-2012 06:25 AM
I currently have 2 existing switches running in production - Brocade 48000 (SAN core) and Brocade 5100 (SAN edge). These 2 switches are currently connected by a single 4G ISL. The ISL port on the 5100 is enabled for trunking but the ISL port on the 48000 is not enabled for trunking. I have 2 questions:
1) If I enable trunking on the ISL port on the 48000, will that cause a brief outage? Can trunking be enabled "on the fly" even when the port is in use?
2) If I add another connection between the 2 switches mentioned above (using the same quad ASIC as the current ISL) and trunking is enable on both new ports, will the trunk form without any outage or downtime?
01-30-2012 11:30 AM
you can change / enable E-port trunk on a port on the fly from a technical point of view. This will generate a port down and port up cycle. This will interrupt your traffic. As well the routing table will be updated and change. Sometimes this can be a problem for tape backups which are running. So choose a time with low traffic.
The trunk will form if all requirements fulfilled. Same speed, same portgroup and same lenght of the cable and a vaild license key on both switches. Avoid diffenrent cable lenght.
01-31-2012 07:44 AM
Thanks for your assistance. I just require some further clarification on the forming of a trunk:
If I have a single ISL currently up and running between two switches and all the criteria to form a trunk are fulfilled. Will there be a brief outage (i.e. port down and port up cycle) when I bring up a second ISL with the purpose of creating a trunk? Or can the creation of a trunk be accomplished without interrupting traffic?