Re: Action on SeqNumberMismatch

[Acee Lindem <[e-mail]>]

Hi  Igor,

Igor Miroshnik wrote:

>All,
>
>RFC 2328 says:
>
>"  State(s):  Exchange or greater
>
>     Event:  SeqNumberMismatch
>
> New state:  ExStart
>
>    Action:  The (possibly partially formed) adjacency is torn
>      down, and then an attempt is made at
>      reestablishment.  The neighbor state first
>      transitions to ExStart.  The Link state
>      retransmission list, Database summary list and Link
>      state request list are cleared of LSAs.  Then the
>      router increments the DD sequence number in the
>      neighbor data structure, declares itself master
>      (sets the master/slave bit to master), and starts
>      sending Database Description Packets, with the
>      initialize (I), more (M) and master (MS) bits set.
>      This Database Description Packet should be otherwise
>      empty (see Section 10.8)."
>
>Questions:
>
>1) Is the Database Description Packet sent empty?
>
Yes.

>2) If so, what is the meaning of the word "otherwise" in the end of the
>quotaton?
>
It means that the DD packet only contains the OSPF header and the fixed
portion of the DD
packet (i.e., interface mtu, options,  DD bits, and DD sequence number).


>
>Thanks,
>Igor
>
>
>