> # Guidelines and Limitations

> This section lists the guidelines for Cisco TrustSec FC Link Encryption:

> - Ensure that Cisco TrustSec FC Link Encryption is enabled only between MDS switches. This feature is supported only on E-ports or the ISLs, and errors will result if non-MDS switches are used.
> - Ensure that the peers in the connection have the same configurations. If there are differences in the configurations, a “port re-init limit exceeded” error message is displayed.
> - Before applying the SA to the ingress and egress hardware of a switch interface, ensure that the interface is in the admin shut mode.

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