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Browse Prior Art Database

Safe Store of Advanced Peer-to-Peer Networking Adjacent Node Control Blocks

IP.com Disclosure Number: IPCOM000105539D
Original Publication Date: 1993-Aug-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Heller, DA: AUTHOR [+2]

Abstract

When an Advanced Peer-to-Peer Networking (APPN) system rejoins the network after an outage due to an IPL of that system, it must determine the current topology of the APPN network. The current architecture does not distinguish between the cases of an outage due to a link failure and an outage due to a node failure. It calls for exchange of topology information based on the last known values transmitted on that link. In the case where a node had been IPL'd, the entire topology information must be exchanged, since there are no currently known transmitted values. For networks of any size, this retransmission of the entire topology can be quite time consuming, and a severe hindrance to the use of the network. This invention eliminates the need for a complete topology exchange after each IPL.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Safe Store of Advanced Peer-to-Peer Networking Adjacent Node Control Blocks

      When an Advanced Peer-to-Peer Networking (APPN) system rejoins
the network after an outage due to an IPL of that system, it must
determine the current topology of the APPN network.  The current
architecture does not distinguish between the cases of an outage due
to a link  failure and an outage due to a node failure.  It calls for
exchange of topology information based on the last known values
transmitted on that link.  In the case where a node had been IPL'd,
the entire topology information must be exchanged, since there are no
currently known transmitted values.  For networks of any size, this
retransmission of the entire topology can be quite time consuming,
and a severe hindrance to the use of the network.  This invention
eliminates the need for a complete topology exchange after each IPL.

      APPN adjacent node information is safe stored.  In particular,
this preserves across IPLs the LAST_FRSN_SENT and LAST_FRSN_RECEIVED
for each node.  When the conwinner and conloser sessions with an
adjacent node are first activated, the LAST_FRSN_SENT and
LAST_FRSN_RECEIVED information in the adjacent node control block is
used to resynchronize topology exchanges.

      When the conloser session is activated, the LAST_FRSN_RECEIVED
is returned to the adjacent node in a CP capabilities exchange.  By
default - that is, without this invention - this value would be zero.
The adjacent node uses th...