Manualsbrain.com
  1. Manuales
  2. Marcas
  3. 3com
  4. S7906E
  5. Instruccion De Instalación

3com S7906E Instruccion De Instalación

Descargar
Página de 2621
 
1-5 
Figure 1-3 A case for Enhanced DLDP mode 
 
 
 
z 
In normal DLDP mode, only fiber cross-connected unidirectional links (as shown in 
be detected. 
z 
In enhanced DLDP mode, two types of unidirectional links can be detected. One is fiber 
cross-connected links (as shown in 
). The other refers to fiber pairs with one fiber not 
connected or disconnected (as shown in 
). To detect unidirectional links that are of the 
latter type, you need to configure the ports to operate at specific speed and in full duplex mode. 
Otherwise, DLDP cannot take effect. When a 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 detect through DLDP authentication. Three DLDP 
authentication modes exist, as described below.  
z 
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 the packets with the two fields conflicting with the 
corresponding local configuration. 
z 
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 the 
packets with the two fields conflicting with the corresponding local configuration. 
z 
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 the packets with the two fields conflicting with the corresponding local 
configuration. 
DLDP implementation 
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. 
 lists DLDP states and the corresponding packets.