Ndp C; Introduction To Ndp; Introduction To Ndp Configuration Tasks - 3Com 8807 Configuration Manual

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Introduction to NDP

Introduction to NDP
Configuration Tasks

NDP C

Neighbor discovery protocol (NDP) is used to discover the information about a
neighbor device directly connected, including the type, software/hardware version,
port connected, ID, port address, and hardware platform of the neighbor device.
A device running NDP periodically sends NDP packets to all ports with NDP
enabled while receiving NDP packets from the neighbor device. The device
receiving a NDP packet does not forward it, but maintains an NDP neighbor
information table on the current device and stores the neighbor information
carried in the NDP packets in this table. Besides neighbor device information, NDP
packets contain the information about the aging timer for the NDP information,
which specifies how long the NDP packets will be stored on the receiving device.
If the NDP neighbor information is not updated even after the aging timer for NDP
information expires, the device automatically deletes the entry corresponding to
the NDP information from the NDP neighbor information table. If the neighbor
information received by the device is different from the original information, the
device updates the corresponding entry in the NDP neighbor information table. If
the neighbor information received by the device is the same as the original
information, the device updates only the aging timer in the NDP neighbor
information table.
You can also clear the current NDP information and collect NDP neighbor
information again.
n
Upon receipt of NDP packets, a switch with NDP disabled directly forwards the
packets to all ports in the same VLAN, while a switch with NDP enabled does not
forward any NDP packet.
Table 663 NDP configuration tasks include:
Configuration task
Configure the NDP in the system
Configure the NDP on a port
Configure the aging timer for NDP
information
Configure the interval at which NDP
packets are sent
ONFIGURATION
Description Related section
Required
Required
Optional
Optional
Section "Enabling NDP in the System"
"Enabling NDP in the System".
Section "Configuring NDP on a Port"
"Configuring NDP on a Port".
Section "Configuring the Aging Timer
for NDP Information" "Configuring
the Aging Timer for NDP Information"
Section "Configuring the interval at
which NDP packets are sent"
"Configuring the interval at which
NDP packets are sent"