Configuring SDLC for Multidrop Connections

Problem

You want to configure a serial port for an SDLC multidrop line supporting several devices.

Solution

SDLC supports multidrop connections. These are serial links that connect to several downstream devices in series. Each device has its own SDLC address, which must be configured in the router. The global DLSw configuration for this example is omitted here because it is identical to the previous example:

dlsw-branch#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
dlsw-branch(config)#interface Serial1
dlsw-branch(config-if)#description Connection to three remote SDLC devices
dlsw-branch(config-if)#encapsulation sdlc
dlsw-branch(config-if)#no keepalive
dlsw-branch(config-if)#nrzi-encoding
dlsw-branch(config-if)#clock rate 4800
dlsw-branch(config-if)#sdlc role primary
dlsw-branch(config-if)#sdlc vmac 4000.CCCC.0000
dlsw-branch(config-if)#sdlc poll-pause-timer 200
dlsw-branch(config-if)#sdlc address 20
dlsw-branch(config-if)#sdlc xid 20 017A0006
dlsw-branch(config-if)#sdlc partner 4000.3745.AAAA 20
dlsw-branch(config-if)#sdlc address 21
dlsw-branch(config-if)#sdlc xid 21 017A0007
dlsw-branch(config-if)#sdlc partner 4000.3745.AAAA 21
dlsw-branch(config-if)#sdlc address 22
dlsw-branch(config-if)#sdlc xid 22 017A0008
dlsw-branch(config-if)#sdlc partner 4000.3745.AAAB 22
dlsw-branch(config-if)#sdlc slow-poll 30
dlsw-branch(config-if)#sdlc dlsw 20 21 22
dlsw-branch(config-if)#end
dlsw-branch#

Discussion

The basic router ...

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