H3C Technologies H3C S12500 Series Switches - Manual (Page 51)

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Table 15 Procedures for processing different types of DLDP packets received
Packet type Processing procedure
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packet with RSY
tag
Retrieves the
neighbor
information
If the corresponding neighbor entry does not exist, creates
the neighbor entry, triggers the Entry timer, and transitions
to Probe state.
If the corresponding neighbor entry already exists, resets
the Entry timer and transitions to Probe state.
Normal
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packet Retrieves the
neighbor
information
If the corresponding neighbor entry does not exist, creates
the neighbor entry, triggers the Entry timer, and transitions
to Probe state.
If the corresponding neighbor entry already exists, resets
the Entry timer.
Flush packet
Determines
whether or not the
local port is in
Disable state
If yes, performs no process.
If no, removes the corresponding neighbor entry (if any).
Probe packet
Retrieves the
neighbor
information
If the corresponding neighbor entry does not exist, creates
the neighbor entry, transitions to Probe state, and returns
Echo packets.
If the corresponding neighbor entry already exists, resets
the Entry timer and returns Echo packets.
Echo packet
Retrieves the
neighbor
information
If the corresponding neighbor entry does not exist, creates
the neighbor entry, triggers the Entry timer, and transitions
to Probe state.
The
correspondi
ng neighbor
entry
already
exists
If the neighbor information it carries
conflicts with the corresponding locally
maintained neighbor entry, drops the
packet.
Otherwise, sets the flag of the neighbor as
two-way connected. In addition, if the
flags of all the neighbors are two-way
connected, the switch transitions from
Probe state to Advertisement state, and
disables the Echo timer.
Disable packet
Checks whether
the local port is in
Disable state
If yes, performs no process.
If not, sets the state of the corresponding neighbor to
unidirectional, and then checks the state of other
neighbors. If all the neighbors are unidirectional,
transitions the local port to the Disable state. If the state of
some neighbors is unknown, waits until the state of these
neighbors is determined. If bidirectional neighbors are
present, removes all unidirectional neighbors.
RecoverProbe
packet
Checks whether
the local port is in
Disable or
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state
If not, performs no process.
If yes, returns RecoverEcho packets.
RecoverEcho Checks whether If not, performs no process.