Unless specifically stated in the debug output that these are OSPF
neighbor hello's then the hello's you are seeing sent are not to verify the
neighbor still exists, rather the link/interface.
To test you can specify a longer hello-interval for OSPF, and then debug.
If you set the OSPF neighbor hello-interval to say 15 secs and leave the
interface default to say 8/10 secs, and if you debug and see the hello
packet sent at 8/10 secs you'll know it's the link hello.. If you see the
hello sent at 15 secs you'll know its the OSPF hello..
Can't explain why the other side debug doesn't show receipt... unless debug
doesn't pickup receipt of interface hellos, but the routing protocol
instead.
enough contemplation.. :)
"Jaeheon Yoo" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi,
>
> in p.463 of Building Scalable Cisco Networks
> ---------------------------------------------------
> During testing with debug commands, it was found that OSPF does send
> Hello and DBD packets on passive interfaces, but does not send LSUs.
> EIGRP does not send anything on passive interfaces.
> -----------------------------------------------------
>
> I tested it by myself, Yes, it is true when you believe what the
> debugger says, "debug ip packet" reports it's sending hellos on a
> passive interface, But on the other end, the same "debug ip packet"
> says no hellos from the passive interface are received.
>
> So what's going on here? I still firmly believe no hellos are sent on
> a passive interface. Then is it a BUG in IOS?
>
> Thanks in advance.
>
> Jaeheon
>
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