Bridge Port Extender General Limitations

In the Extended Edge Switching architecture, Layer-2, Layer-3, multicast, and filtering operations take place on the controlling bridge. The controlling bridge switch and attached BPEs constitute a single, extended switch system. Therefore, the Extended Edge Switching system assumes the scale and limits from the specific controlling bridge model in use. For applicable limits, see the Limits tables in the ExtremeXOS Release Notes.
Certain ExtremeXOS features are not supported or have limitations. For information, see ExtremeXOS Feature Compatibility with V400 Virtual Port Extenders.
A maximum of 48 attached BPEs is supported (20 BEPs for 5420 controlling bridge).
A maximum of 4 levels (tiers) of cascaded BPEs is supported.
A maximum of 4 upstream ports (in a LAG) per BPE is supported (with V400-48).
Trusted ports on BPEs cannot be used as user data ports. No protocols or features should be applied/configured on this port.