VSF restrictions
VSF is mutually exclusive with distributed trunking, mesh, and Q-in-Q.
- VSF port restrictions:
Must be 10Gbps/1Gbps.
A VSF link can only comprise ports with the same speed; either all 10G or all 1G. A VSF port speed which does not match with the global port speed, will be in a down state. The command
show vsf link detail
will display an error message.Maximum eight ports can be configured on one VSF link.
VSF ports must be directly connected and there should be no transit devices between members.
In a VSF virtual chassis, flow-control is not supported between ports on different chassis across VSF links.
A VSF stack downgrade is not allowed if we try to downgrade a 2930 VSF stack having a stack size greater than four members, to an image lesser than 16.06.
For switches running software versions lesser than 16.06, it is recommended to first upgrade to 16.06 for supporting a stack having more than four members.
VSF merge between a fragment running a software version 16.06 and a fragment running an image lesser than 16.06 is not recommended.
A power outage or cable connection failures can split a stack with greater than four members, into more than two fragments (for example, 1-2-3-4, 5-6, and 7-8). To restore the stack to its previous state after addressing the issues, ensure that not more than two fragments are merged at a time. For example, merge 1-2-3-4 with 5-6, followed by merging 1-2-3-4-5-6 with 7-8.