01-02-2013 01:49 AM
Wonder if somebody coud shed some light on the following issue.
We have a DCX and a 48000 that are currently linked up using two trunk groups. Each trunk group consists of two physical links. So in total we have 4 links that are the ISL between the two switches.
We are wanting to do the following, and we are unsure whether it is configuration which would work:
1.Create a virtual switch on the 48000
2.Create a virtual switch on the DCX
3.The virtual switch on each switch will consist of 4 ports
4.Run cabling between the ports on each vswitch
5.Turn the 4 links into an ISL
The end goal is to get the new virtual switches to become the ISL for the physical switches. However, the virtual switches are seperate entities in their own right, so could we merge the virtual switches into the same fabric and then make them the ISL?
01-02-2013 02:17 AM
Thanks for the info, the reason I ask these questions is because this happened recently:
One of the SFPs one of the links that forms one of the ISLs failed. This reduced the TX/RX bandwidth on that ISL to 8gbps. This then created a bottleneck on the link. We would have expected the other trunk to take the workload, but it didn't. This affected service quite badly and a storage array sent some continuos access volumes into an error replication state.
So I suppose the question is, why didnt the other trunk ISL link take over the workload, when the other dropped a link?
If there are two seperate trunks forming two seperate ISLs, will one take the wokrload of the other, if the bandwidth drops to half on the faulting ISL?