By design, hellos and lsa's are surpressed.  Do a search on CCO for a demand
circuit for further info..

""[EMAIL PROTECTED] (Aaron ZHAO)""  wrote in
message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> hi, all
>
> I have a question about OSPF over DDR. The lab scenario is:
>
> 1. RTA and RTB connect with each other using back-to-back connection with
> serial PPP connection, and use the asynchronous interface as the backup
> interface.
>
> 2. And on each router there is a ethernet interface as a stub network. All
> the networks run ospf and belong to 3 areas respectively. PPP and its
> backup links are all in the area 0.
>
> 3. I have use the "broadcast" key word in the rout map, and correctly
> define the dialer-list with ip permit.
>
> Question:
> When the primary PPP link is down, the DDR works correctly. But there is
> not hello packet can be find on the DDR. When I show the interface
> asynchronous 1 under the ospf, I find that: no hellos (passive interface).
> What is mean?
>
> Why?  can not explain it. Can you help me?
>
> Thanks a lot.




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