Node initiating XID exchanges over an activated link including a

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364228, 364229, 3642327, 36424296, 364260, 3642844, 36493145, 36494064, G06F 1300, G06F 1516

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051094835

ABSTRACT:
Enhanced type 2.1 nodes for SNA networks provide network routing of information between non-adjacent network nodes and program-to-program linkage across the network. These nodes are called "advanced peer to peer networking" (abbreviated APPN) nodes. Network state information, describing the topology and resources of the network is disseminated betweeen APPN nodes by a first data link control exchange of identification (XID) information indicating node type (and thereby distinguishing APPN nodes from other nodes) and other exchanges conducted over a newly defined control point to control point (abbreviated CP--CP) session having a message architecture unique to APPN type nodes. The XID exchange is conducted whenever a link between nodes is activated, and when the exchanging nodes are both APPN, and if both are available to participate in as CP--CP session, they automatically engage in a second exchange of session binding signals which establish a pair of sessions between the nodes. By internal conventions, the node components which use the session pair for exchanging their network state information adapt the sessions to be used in simplex modes with one session flowing from one node to the other and the other flowing in reverse from the other node to the one node. Within these sessions, for the sake of efficiency, communications are not directly acknowledged. Instead, a process transparent to the sessions monitors for link failure and upon such occurrence notifies all affected components to terminate their use of the session and deactivate the session.

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patent: 4586134 (1986-04-01), Norstedt
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patent: 4720784 (1988-01-01), Radhakrishnan et al.
patent: 4791566 (1988-12-01), Sudama et al.
Meijer et al., Computer Network Architectures, 1982, pp. 109-110 and 125-131.

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