HP 6125G HP 6125G & 6125G/XG Blade Switches High Availability Configur - Page 39

DLDP processes, A device sends Flush packets when it transits to the Initial state from the Active

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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. • 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 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 Active Advertisement Probe Disable Type of DLDP packets sent Advertisement packet with RSY tag Normal Advertisement packet Probe packet 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. 32

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32
•
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.
•
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 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
.