H3C S9500E Series Configuration Manual page 35

Figure 5 A situation for Enhanced DLDP mode
In normal DLDP mode, only fiber cross-connected unidirectional links (as shown in Figure 3 ) can be
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detected.
In enhanced DLDP mode, two types of unidirectional links can be detected. One is fiber cross-connected
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links (as shown in Figure 3 on Page 31). The other refers to fiber pairs with one fiber not connected or
disconnected (as shown in Figure 4 on Page 32). To detect unidirectional links that are of the latter type,
configure the ports to operate at a specific speed and in full duplex mode. Otherwise, DLDP cannot take
effect. When one fiber of a fiber pair is not connected or gets disconnected, the port that can receive
optical signals is in Disable state; the other port is in Inactive state.
DLDP authentication mode
You can prevent network attacks and illegal detecting through DLDP authentication. Three DLDP
authentication modes exist, as described below.
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Non-authentication. In this mode, 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 those two fields conflict with
the corresponding local configuration.
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Plain text authentication. In this mode, 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 of received DLDP
packets and drops packets where the two fields conflict with the corresponding local
configuration.
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MD5 authentication. In this mode, 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 of received DLDP packets and drops packets where the two fields conflict with the
corresponding local configuration.
DLDP processes
On a DLDP-enabled link that is in up state, DLDP sends DLDP packets to the peer switch and
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processes the DLDP packets received from the peer switch. DLDP packets sent vary with
DLDP states. Table 12 lists DLDP states and the corresponding packets.
Table 12 DLDP packet types and DLDP states
DLDP state Type of DLDP packets sent
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