Dell S6100 Configuration Manual page 348

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Only RSTP and PVST are supported in the VLT environment. Enabling either RSTP or PVST effects FRRP functionality even though

these features are disabled on FRRP enabled interfaces.

Dell Networking OS does not support coexistence of xSTP and FRRP configurations. Meaning, if there is any active FRRP ring in the

system, then you cannot enable xSTP in the system globally or at the interface level. Similarly, if xSTP is enabled, then you cannot

configure FRRP in the system.

You cannot configure VLT LAG interfaces as FRRP ring interfaces.

When ICL is configured as an FRRP ring interface, you cannot remove ICL and VLT domain configurations.

When FRRP is enabled on a VLT domain, you cannot enable any flavor of the spanning tree protocol (STP) concurrently on the nodes

corresponding to that VLT domain. Meaning, FRRP and xSTP cannot coexist in a VLT environment.

Force10 Resilient Ring Protocol (FRRP)

Troubleshooting