Figure 3-11 False Connection Of Interface - Zte ZXR10 5900E Product Description

ZXR10 5900E Product Description

In aggressive mode, sends Hello neighbor joining message, and receives Echo
message which indicates the neighbor of the peer-end is not itself.

In aggressive mode, receives Hello neighbor joining message, and sends Echo
message; but no Echo message from the peer-end is received.

In aggressive mode, all neighbors at the interface exceed the aging period, and no
Hello detection message is received.
When the interface is Down or other accidents occurs that leads to failure of the interface,
the device needs to send a flush message to notify the adjacent L2 device to delete the
information of it.
Initiate UDLD: if the Echo message received indicates that the neighbor of the peer-end
is not itself; it's a false connection of interface. UDLD shut down the interface whatever
the mode is as shown iin the following Figure:

Figure 3-11 False connection of interface

TX
TX
54
Device A
PORT
RX
RX
PORT
Device B
PORT
TX RX
TX RX
PORT
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