[trill] [TRILL FGL] A question about RFC7172

[Zouwenyu <[e-mail]>]

Hi Donald,

    In RFC7172, there are three types of RBridge: VL RBridge, FGL-safe RBridge and FGL RBridge.

    As specified in [RFC7172], Section 8.2, the flag 1 in the TRILL-VER sub-TLV should be set to indicate that a RBridge is FGL-safe.

    For FGL-edge RBridge, the Interested Labels and Spanning Tree Roots Sub-TLV which is specified in [RFC7176], Section 2.3.8, could indicate that a RBridge is FGL RBridge.

    But how to decide whether a RBridge is FGL or not, which is only a transit FGL RBridge? I have not seen any TLV or flags to indicate that.


Thanks.
Regards,
wenyu

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