H3C Technologies H3C S10500 Series Switches - Manual (Page 44)

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• Non-authentication:
{
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 the
packets where the two fields conflict with the corresponding local configuration.
• Plain text authentication:
{
Before sending a DLDP packet, the sending side sets the Authentication field to the password
configured in plain text 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 using 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 Type of DLDP packets sent
Active Advertisement packet with RSY tag
Advertisement Normal Advertisement packet
Probe Probe packet
Disable Disable packet and then RecoverProbe packet
NOTE:
A device sends Flush packets when it transits to the Initial state from the Active, Advertisement, Probe, or
DelayDown state but does not send them when it transits to the Initial state from Inactive or Disable state.
2. A received DLDP packet is processed with the following methods.
• In any of the three authentication modes, the packet is dropped if it fails to pass the authentication.
• The packet is dropped if the setting of the interval to send Advertisement packets it carries conflicts
with the corresponding local setting.
• Other processes are as shown in Table 15 .