Hi,
in p.463 of Building Scalable Cisco Networks
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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.
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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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