Cisco Systems Inc.

Cisco Technology, Inc.

Wayne Clark

Ravi Periasamy

Ramin Naderi

Frank Bordonaro

Gnanaprakasam Pandian

Kushal A Patel

David Lowry

Heterogeneous resources of an integrated network environment are managed from a single network management station by correlating information pertaining to those resources. The integrated network environment generally comprises SNA and NetBIOS entities coupled to IP routers. Address information pertaining to selected IP routers and SNA entities are acquired by the routers through a series of SNA message flows. Similarly, a series of NetBIOS message flows among those IP routers coupled to the NetBIOS entities result in the acquisition of IP and NetBIOS address information of these resources at the routers. This information is used to create an IP-centric map of the network. In addition, the SNMP agents provide name information pertaining to the SNA-specific and NetBIOS-specific resources to the console using an SNMP protocol. The name information are overlaid on the map to facilitate monitoring of those specific resources by the SNMP tool.

Technique for correlating logical names with IP addresses on

Backup peers in an asymmetrically organized computer network are organized into a 'pool' of available devices that are activated as necessary. The network comprises a set of remote peers and a set of local peers directly associated with a central computational facility, the local peers facilitating connection between the remote peers and the central facility. During the capabilities exchange, the 'primary' local peer to which the remote peer connects provides a list of backup peer devices to the remote peer. If the primary peer fails (or if the rate of message exchange falls below some predetermined threshold), the remote peer can use the backup information to access a backup peer from the pool. The invention allows each backup peer to be assigned to multiple remote peers, with the total number of backup peers determined by aggregate backup utilization (rather than simply assigning an individual backup peer to each primary peer regardless of whether such a high level of redundancy is justified).

Backup peer pool for a routed computer network

A hierarchical wide-area network architecture which conforms to the DLSw protocol is provided, in which multiple routers having a logical connection to one another are designated as a peer group. At least one router in each peer group is designated as a border peer, and functions as a gateway between the members of its group and other peer groups. The peer group structure reduces broadcast traffic on slow links by changing the source of the broadcast from a small access router with a relatively slow link to another, more powerful router, with a faster link on the network. More than one border peer can be included in each group, to share the transmission workload and act as a backup. The border peers can share information about the groups that they service and can cooperate to provide a single-point broadcast service to all of the users of the service. When two or more routers are connected to a network in parallel to provide back-up facilities, conditional filters are employed to prevent redundant operations. Different types of frames are handled by the two different routers, so that they share the communication load between them and make the most effective use of the available bandwidth.

Network having at least two routers, each having conditional filter so

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Cary, NC, United States of America

Wayne Clark