H3C Technologies H3C S3100 Series Switches - Manual (Page 160)

Operation Manual – DLDP
H3C S3100-52P Ethernet Switch Chapter 1 DLDP Configuration
1-6
Packet type Processing procedure
If the neighbor entry already exists on the local
device, DLDP updates the entry aging timer.
Flush packet Deletes the neighbor entry from the local device
Creates the neighbor entry if this neighbor
entry does not exist on the local device.
Probe packet
Sends echo
packets
containing both
neighbor and its
own information
to the peer
If the neighbor entry already exists on the local
device, updates the entry aging timer.
No Discards this echo packet
No Discards this echo packet
Sets the neighbor flag bit
to bidirectional link
Echo packet
Checks
whether
the local
device is
in the
probe
state
Yes
Checks
whether
neighbor
information
in the
packet is
the same
as that on
the local
device
Yes
If all neighbors are in the
bidirectional link state,
DLDP switches from the
probe state to the
advertisement state, and
sets the echo waiting
timer to 0.
3) If no echo packet is received from the neighbor, DLDP performs the following
processing:
Table 1-6
Processing procedure when no echo packet is received from the neighbor
No echo packet received
from the neighbor
Processing procedure
In normal mode, no echo
packet is received when the
echo waiting timer expires.
In enhanced mode, no echo
packet is received when the
enhanced timer expires
DLDP switches to the disable state, outputs log and
tracking information, and sends flush packets.
Depending on the user-defined DLDP down mode,
DLDP disables the local port automatically or
prompts you to disable the port manually. DLDP
sends an RSY message and deletes the neighbor
entry.
1.1.2 Precautions during DLDP Configuration
z
DLDP works only when the link is up.
z
To ensure unidirectional links can be detected, you must make sure that DLDP is
enabled on both sides, and that the interval between sending advertisement
packets, authentication mode, and password are consistent on both sides.
z
You can adjust the interval between sending advertisement packets in different
network circumstances so that DLDP can respond rapidly to a link failure. The