Dldp Status - H3C S3100-52P Operation Manual

Operation Manual – DLDP
H3C S3100-52P Ethernet Switch
Table 1-4 Processing procedure when no echo packet is received from the neighbor
No echo packet received from the
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

1.2.2 DLDP Status

A link can be in one of these DLDP states: initial, inactive, active, advertisement, probe,
disable, and delaydown.
Table 1-5 DLDP status
Status
Initial
Inactive
Active
Advertisement
Probe
Disable
DelayDown
neighbor
Initial status before DLDP is enabled.
DLDP is enabled but the corresponding link is down
DLDP is enabled, and the link is up or an neighbor entry is cleared
All neighbors communicate normally in both directions, or DLDP
remains in active state for more than five seconds and enters this
status. It is a stable state where no unidirectional link is found
DHCP sends packets to check whether the link is a unidirectional.
It enables the probe sending timer and an echo waiting timer for
each target neighbor.
DLDP detects a unidirectional link, or finds (in enhanced mode)
that a neighbor disappears. In this case, DLDP sends and
receives only recover probe packets and recover echo packets.
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. After the DelayDown timer expires, the DLDP neighbor
information is removed.
1-6
Chapter 1 DLDP Configuration
Processing procedure
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 RSY messages
and removes the corresponding
neighbor entries.
Description