Huawei Quidway S5600 Series Operation Manual page 209

Operation Manual - DLDP
Quidway S5600 Series Ethernet Switches-Release 1510
Packet type
Probe packet
Echo packet
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
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
1.1.2 Precautions During DLDP Configuration
DLDP works only when the link is up.
To insure unidirectional links can be detected, you must make sure: DLDP is
enabled on both ends, and the interval of sending advertisement packets,
authentication mode and password are consistent on both ends.
You can adjust the interval of sending advertisement packets in different network
circumstances, so that DLDP can respond rapidly to link failure. The interval must
be shorter than one-third of the STP convergence time, which is generally 30
seconds. If too long an interval is set, an STP loop may occur before DLDP shut
Processing procedure
Send echo Create the neighbor entry if this neighbor entry
packets does not exist on the local device.
containing both
neighbor and its
If the neighbor entry already exists on the local
own information
device, refresh the entry aging timer.
to the peer
No Discard this echo packet
Check
whether
Check
neighbor
whether
information
the local
in
device is
Yes
packet
in probe
the
status
as that on
the
device
DLDP turns into disable status. It outputs log and
tracking
Depending on the user-defined DLDP down mode,
DLDP disables the local port automatically or prompt
the user to disable the port manually. DLDP sends
the RSY message and deletes the neighbor entry
Huawei Technologies Proprietary
1-6
Chapter 1 DLDP Configuration
No Discard this echo packet
Set the neighbor flag bit
to bidirectional
If all neighbors are in
the
bidirectional
is
Yes
communication
same
DLDP turns from probe
status to advertisement
local
status, and sets the echo
waiting timer to 0.
Processing procedure
information, sends
state,
flush packets.