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.