Dldp Operating Mode - H3C S3100-52P Operation Manual

Operation Manual – DLDP
H3C S3100-52P Ethernet Switch
Enhanced timer
DelayDown timer

1.2.4 DLDP Operating Mode

DLDP can operate in two modes: normal and enhanced.
Table 1-7 DLDP operating mode and neighbor entry aging
DLDP operating
mode
Normal mode
Timer
In the enhanced mode, if no packet is received from the
neighbor when the entry aging timer expires, DLDP enables
the enhanced timer for the neighbor. The enhanced timer
length is 10 seconds
The enhanced timer then sends one probe packet every
second and eight packets successively to the neighbor.
If no echo packet is received from the neighbor when the
enhanced timer expires, the state of the local end is set to
unidirectional communication state and the state machine
turns into the disable state. DLDP 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. Meanwhile, DLDP deletes the neighbor entry.
When a device in the active, advertisement, or probe DLDP
state receives a port down message, it does not removes the
corresponding neighbor immediately, neither does it
changes to the inactive state. Instead, it changes to the
delaydown state first.
When a device changes to the delaydown state, the related
DLDP neighbor information remains, and the DelayDown
timer is triggered. The DelayDown timer is configurable and
ranges from 1 to 5 seconds.
A device in the delaydown state only responds to port up
messages.
A device in the delaydown state resumes its original DLDP
state if it receives a port up message before the delaydown
timer expires. Otherwise, it removes the DLDP neighbor
information and changes to the inactive state.
DLDP detects
whether neighbors
exist or not when
neighbor tables are
aging
No
Description
The entry aging
timer is enabled
or not during
neighbor entry
aging
Yes (The neighbor
entry ages out
after the entry
aging timer
expires)
1-8
Chapter 1 DLDP Configuration
The enhanced
timer is enabled
or not when the
entry aging timer
expires
No