HPE FlexNetwork HSR6800 series Configuration Manual page 42

The sending side sets the Authentication field and the Authentication type field of DLDP
packets to 0.
The receiving side checks the values of the two fields of received DLDP packets and drops
packets where the two fields conflict with the corresponding local configuration.
•
Simple authentication:
Before sending a DLDP packet, the sending side sets the Authentication field to the user
configured password and sets the Authentication type field to 1.
The receiving side checks the values of the two fields in received DLDP packets and drops
any packets where the two fields conflict with the corresponding local configuration.
•
MD5 authentication:
Before sending a packet, the sending side encrypts the user configured password by using
the MD5 algorithm, assigns the digest to the Authentication field, and sets the
Authentication type field to 2.
The receiving side checks the values of the two fields in received DLDP packets and drops
any packets where the two fields conflicting with the corresponding local configuration.
DLDP processes
1. On a DLDP-enabled link that is in up state, DLDP sends DLDP packets to the peer device and
processes the DLDP packets received from the peer device. DLDP packets sent vary with
DLDP states.
Table 14 DLDP packet types and DLDP states
DLDP state
Active
Advertisement
Probe
Disable
NOTE:
A device sends Flush packets when it transits to Initial state from Active, Advertisement, Probe, or
DelayDown state, but does not send them when it transits to the Initial state from Inactive or Disable
state.
2. DLDP processes the packet received from a neighbor in the following ways:
In any of the three authentication modes, drops the packet if it fails to pass authentication.
Drops the packet if it carries an advertisement interval different than the local setting.
Processes the packet and handles DLDP port state as shown in
type.
Table 15 Processing incoming DLDP packets by packet type
Packet type
Advertisement with
RSY tag
Normal
Advertisement
Type of DLDP packets sent
Advertisement packet with RSY tag.
Normal Advertisement packet.
Probe packet.
Disable packet and then RecoverProbe packet.
Processing procedure
If no matching neighbor entry exists, creates the neighbor
entry, triggers the Entry timer, and changes the DLDP port
Retrieves the
state to Probe.
neighbor
information.
If a matching neighbor entry already exists, resets the Entry
timer and changes the DLDP port state to Probe.
Retrieves the If no matching neighbor entry exists, creates the neighbor
neighbor entry, triggers the Entry timer, and changes the DLDP port
information. state to Probe.
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Table 15 depending on its