User Guide

Implicit assignment
Implicit assignment
example
Note
12 Configuration and Use - CIP & IP Routing
124 / 288
3EC 36231 ABAA TCZZA Ed. 01
12.2.3 Implicit Assignment Mechanism
If the remote side is RFC1577/RFC2225 compliant, e.g. another
STPro, your local STPro is able to retrieve the remote IP address
of the CIP PVC, by issuing an InATMARP request on that PVC.
That way, you must not specify an IP address for the CIP PVCs you
add to the 'CIP Connections' table, it will be implicitly assigned
when connecting to the LIS.
The sequence below describes an example of an implicit
assignment mechanism:
Phase Decision and Description
1 Suppose you added a CIPPVC without supplying an IP address (e.g.
CIPPVC2).
2 The STPro will automatically issue an InATMARP request on this PVC.
3 Is the remote side is RFC1577/RFC2225 compliant ?
Yes No
4 It responds with an InATMARP
reply, containing its IP address.
The CIP's remote IP address in the
'CIP Connections' table is
completed.
"Unresolved" will show up in the
'Remote IP Address' field.
Consequently the CIPPVC cannot
be assigned and IP connectivity
will not exist with the remote
hi
5 Does the remote address share a
LIS with a local CIP member ?
machine.
Yes No
6 the CIPPVC is
assigned to this
member.
Connectivity is
assured.
"Unresolved"
will show up.
No connectivity
exists.
The grey shaded area of the table indicates the sequence of a
correct RFC1577/RFC2225 compliant LIS interconnection.