3com 3031 Instruccion De Instalación

After configuration, using the

 command, you 

can view the PVC table.

Perform the following in the System View.

After configuration, using the 

 command, you 

can view the SVC table.

Using the hunt group feature in X.25 protocol, network providers can provide the 
load sharing function on X.25 packet switching network.X.25 load sharing can 
implement the load sharing between different DTEs or between different links in 
the same DTE, so as to ensure that link overload will not occur when a large 
number of users access the same address.

X.25 load sharing is provided by DCE. To implement load sharing on X.25 
network, you need to configure a set of DTE/DCE interfaces (synchronous serial 
interface or XOT channel) as a hunt group on the remote DCE, and to assign an 
X.121 address to this hunt group. When accessing the DTE in hunt group, other 
devices in the network need to call the hunt group address. After receiving call 
request packet, the remote DCE will select a line from hunt group and send 
incoming call packet based on different channel selection policies (round-robin or 
vc-number). Different calls will be distributed on various lines in hunt group, so as 
to implement load sharing.

Note that X.25 hunt group selects different transmission lines only during VC call 
establishment. Once the whole VC completes the establishment and enters data 
transfer phase, X.25 hunt group will not function any longer and data transfer will 
be processed based on the normal VC. Since PVC is in data transfer phase after 
establishment and has not experienced call establishment and call clearing 
processes, X.25 load sharing can function only on SVC, and not on PVC.

In an X.25 hunt group, the position of all DTEs is identical, and they have the same 
X.121 address. DTEs inside hunt group can call other DTEs outside hunt group 
according to the normal mode. When accessing hunt group, the devices outside 

Table 373   Adding/Deleting a PVC route

Add a PVC 

x25 switch pvc number channel interface serial 
port-number pvc number

Delete a PVC 

Table 374   Adding/Deleting an SVC

Add an SVC

x25 switch svc x.121-address [ sub-dest 
destination-address ] [ sub-source source-address ] 
interface serial interface-number

Delete a SVC

undo x25 switch svc x.121-address [ sub-dest 
destination-address ] [ sub-source source-address ] [ 
interface serial interface-number ]