proposed TRILL IS-IS System ID text

    3. An implementation that has only PPP links might have no previously
       configured Media Access Control (MAC) that can function as an
       IS-IS System ID.  In this case, the System ID is formed by adding
       a randomly generated 14-bit leading number (in place of an OUI) to
       the link's unique LCP Magic Number. The Magic Number MUST be
       unique for all links and all known link peers. This pseudo-MAC
       MUST have both the "locally-assigned" and "broadcast/multicast"
       (group) bits set to 1; that is, the least significant two bits of
       the most significant octet are both set to 1.

...

    Operational Considerations

       Although the probability of conflict with another IS-IS System ID
       is minuscule, each implementation MUST have a configuration option
       to override the System ID.
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