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212 CHAPTER 16: CONFIGURING LAPB AND X.25
Generally, inter-network protocols will need to send some broadcast datagrams
for specific purposes. On the broadcasting physical networks (such as Ethernet),
such requirements are naturally supported. But for non-broadcasting networks like
X.25, how to realize the broadcasting?
The X.25 of the 3Com Router series can enable this to decide if the broadcast
packet should be duplicated and sent to a destination. This is very important. For
instance, the broadcast-based application layer routing protocol will request
broadcasting datagram sent by X.25 to exchange routing information on the X.25
network.
It can be specified whether to send broadcasting data packets on the related
virtual circuits of both SVC and PVC.
Table 253 Set broadcast via X.25
7 Restrict the use of address mapping
X.25 calls are closely related to address mapping: before a destination is called,
this destination must be found in the address mapping table. Before a call is
received, the source of this call must also be found in the address mapping table.
But in some cases, some address mappings are used for calling out only, while
others are used for calling in only.
The X.25 of the 3Com Router series allows restricting the use of this address
mapping addition by adding some option items, as shown in the following table.
Table 254 Restrict the use of address mapping
8 Configure interface with standby center
The powerful standby function of the 3Com Router series is provided by the
"standby center". To add an X.25 interface into the standby center, perform the
following task in the interface view.
Table 255 Set interface with standby center
Operation Command
Enable to send broadcasting data packets to
the peer of the SVC associated with this
address mapping
x25 map protocol
protocol-address
x121-address x.121-address
broadcast
Enable to send broadcasting data packets to
the peer of this PVC
x25 pvc pvc-number protocol
protocol-address x121-address
x.121-address broadcast
Operation Command
Inhibit outgoing call through this address
mapping
x25 map protocol protocol-address
x121-address X.121-address
no-callout
Inhibit incoming call through this address
mapping
x25 map protocol protocol-address
x121-address X.121-address
no-callin
Operation Command
Set the logical interface number of this address
mapping in the standby center
X25 map protocol
protocol-address x121-address
x.121-address logic-channel
logical-interface-number