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DLDP Overview 91
DLDP operating mode
DLDP can operate in two modes: normal and enhanced.
DLDP implementation
1 If the link is up after DLDP is enabled on the port, DLDP sends DLDP packets to the
peer device, and analyses and processes DLDP packets received from the peer device.
DLDP in different status sends different packets.
.
Entry aging timer When a new neighbor joins, a neighbor entry is created, and the
corresponding entry aging timer is enabled.When an advertisement
packet is received from a neighbor, the neighbor entry is updated, and
the corresponding entry aging timer is reset.In normal mode, if no packet
is received from the neighbor when the entry aging timer expires, DLDP
sends an advertisement packet with RSY tag, and deletes the neighbor
entry.In enhanced mode, if no packet is received from the neighbor
when the entry aging timer expires, DLDP enables the enhanced
timer.The time interval set for the entry aging timer is three times of that
for the advertisement timer.
Enhanced timer In 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 timeout time for the enhanced timer is 10 seconds.The
enhanced timer then sends two probe packets every one second and
totally eight packets continuously to the neighbor.If no echo packet is
received from the neighbor when the Echo waiting timer expires, the
local end is set to unidirectional communication status and the state
machine turns into disable status. DLDP outputs log and tracking
information, sends flush packets. Depending on the user-defined DLDP
down mode, DLDP disables the local port automatically or prompt the
user to disable the port manually. DLDP deletes the neighbor entry.
Table 73 DLDP operating mode and neighbor entry aging
DLDP operating
mode
Whether DLDP
probes neighbor
during neighbor
entry aging
Whether entry aging
timer is enabled during
neighbor entry aging
Whether enhanced
timer is enabled
when entry aging
timer expire
Normal mode No Yes (the neighbor entry ages
after the entry aging timer
expires)
No
Enhanced mode Yes Yes (the enhancement timer
is enabled after the entry
aging timer expires)
Yes (When the
enhanced timer expires,
the local end is set to
single pass status, and
the neighbor entry
ages)
Table 72 DLDP timers (continued)
Timer Description
Table 74 Types of packets sent by DLDP
DLDP status Packet types
Active Advertisement packets, including those with or without RSY tags
Advertisement Advertisement packets
Probe Probe packets