H3C Technologies H3C S3100 Series Switches - Manual (Page 159)

Operation Manual – DLDP
H3C S3100-52P Ethernet Switch Chapter 1 DLDP Configuration
1-5
Table 1-3
DLDP operating mode and neighbor entry aging
DLDP
operating
mode
DLDP detects
whether
neighbors exist
or not when
neighbor tables
are aging
The entry aging timer
is enabled or not
during neighbor entry
aging
The enhanced
timer is enabled or
not when the entry
aging timer expires
Normal
mode
No
Yes (The neighbor
entry ages out after the
entry aging timer
expires)
No
Enhanced
mode
Yes
Yes (The enhanced
timer is enabled after
the entry aging timer
expires)
Yes (When the
enhanced timer
expires, the state of
the local end is set to
unidirectional link,
and the neighbor
entry is aged out.)
IV. DLDP implementation
1) If the DLDP-enabled link is up, DLDP sends DLDP packets to the peer device,
and analyzes and processes the DLDP packets received from the peer device.
DLDP in different states sends different types of packets.
Table 1-4
Types of packets sent by DLDP
DLDP state Packet type
Active
Advertisement packets, including those with or without an RSY
tag
Advertisement Advertisement packets
Probe Probe packets
2) DLDP analyzes and processes received packets from the peer device as follows:
z
In authentication mode, DLDP authenticates the packets, and discards those
failing to pass the authentication.
z
DLDP processes the received DLDP packets.
Table 1-5
Process received DLDP packets
Packet type Processing procedure
Advertisement
packet
Extracts
neighbor
information
If this neighbor entry does not exist on the
local device, DLDP creates the neighbor entry,
enables the entry aging timer, and switches to
the probe state.