E. Decker, P. Langille, A. Rijsinghani, and K. McCloghrie. Definitions of managed objects for bridges. RFC 1493, IETF, July 1993.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....also checks that each response is a valid IP address (i.e. not a broadcast or network address) and filters out responses where a single device responded to multiple IP addresses. In the current implementation, the results are stored in a database. Collect MIB tables from switches: The Bridge MIB [16] contains several objects describing the results of the Spanning Tree Algorithm. Table 3 lists the MIB objects collected from each switch. The contents of each table is described below. Collect MIB tables from the router: Routers cache the mapping from physical address to IP address in 11 Table ....

E. Decker, P. Langille, A. Rijsinghani, and K. McCloghrie, "Definitions of managed objects for bridges," July 1993. RFC 1493.

....Thus, automating the detection of configuration inconsistencies between the database and the current network topology is very important in the Oceano environment. The management agents on network devices provide some indications of configuration changes, e.g. linkUp Down [4] and topologyChange [6] traps. In Yemanja these Yemanja was able to use traps from the management agents on network devices to provide some indications of configuration changes. In Yemanja these traps are used to isolate faults, and trigger database consistency checks. When the linkDown trap is received we check the ....

E. Decker, P. Langille, A. Rijsinghani, and K. McCloghrie. Definition of Managed Objects for Bridges. IETF Network Working Group, 1993. RFC 1493.

....an example of a data link layer topology in which end to end connectivity is achieved through a network of spanning tree bridges. A current spanning tree, which uniquely shows a set of MAC layer links used for communication between any two hosts may be obtained from dot1dBase Group of Bridge MIB [8]. Updates of the spanning tree may be triggered by newRoot and topologyChange traps [8] Obtaining dependency information is, is general, still an open research problem. Some of the available techniques are discussed in [30] link AB link BA link BC link CB link BD link DB path AB ....

....through a network of spanning tree bridges. A current spanning tree, which uniquely shows a set of MAC layer links used for communication between any two hosts may be obtained from dot1dBase Group of Bridge MIB [8] Updates of the spanning tree may be triggered by newRoot and topologyChange traps [8]. Obtaining dependency information is, is general, still an open research problem. Some of the available techniques are discussed in [30] link AB link BA link BC link CB link BD link DB path AB path BA path BC path CB path BD path DB path AC path AD path CA path DA path DC ....

E. Decker, P. Langille, A. Rijsinghani, and K. McCloghrie. Definition of Managed Objects for Bridges. IETF Network Working Group, 1993. RFC 1493.

....results of previous steps. 6) Collect Switch Tables: For each switch, this step collects the interface table (interfaces.ifTable) forwarding table (dot1dBridge.dot1dTp.dot1dTpFdbTable) which maps physical address to port number, and tables needed to generate the spanning tree from the Bridge MIB [28]. Some switches require vendor specific MIBs to generate these tables. The topology information can be used later to find paths between endpoints at layer 3 or at layer 2. The path between routers can be found directly by looking up the destination address in the current router s route table to ....

E. Decker, P. Langille, A. Rijsinghani, and K. McCloghrie, "Definitions of managed objects for bridges," RFC 1493, July 1993.

....Another useful component of this MIB is the IP routing table, which indicates the interface a device will use when sending IP packets to their destination. This is the first item of importance in determining a network s topology. 3. 2 BRIDGE MIB The second most important MIB is the BRIDGE MIB [5]. This MIB provides information about the status of an Ethernet bridge, which is used to forward packets between different portions of a LAN. The interesting part of this MIB is the forwarding database, which stores the port used to reach each of the Ethernet addresses the bridge has seen. Because ....

E. Decker, P. Langille, A. Rijsinghani, and K. McCloghrie. Definitions of managed objects for bridges. RFC1493, July 1993.

....Another useful component of this MIB is the IP routing table, which indicates the interface a device will use when sending IP packets to their destination. This is the first item of importance in determining a network s topology. 3.2. BRIDGE MIB The second most important MIB is the BRIDGEMIB [5]. This MIB provides information about the status of an Ethernet bridge, which is used to forward packets between different portions of a LAN. The interesting part of this MIB is the forwarding database, which stores the port used to reach each of the Ethernet addresses the bridge has seen. Because ....

E. Decker, P. Langille, A. Rijsinghani, and K. McCloghrie. Definitions of managed objects for bridges. RFC1493, July 1993.

....Another useful component of this MIB is the IP routing table, which indicates the route a device will use to send IP packets to their destination. This is the most important information for determining a network s topology. 3.2. BRIDGE MIB The second most important MIB is the BRIDGEMIB [6]. This MIB provides information about the status of an Ethernet bridge, which is used to forward packets between di#erent portions of a LAN. The interesting part of this MIB is the forwarding database, which stores the port used to reach each of the Ethernet addresses the bridge has seen. Because ....

E. Decker, P. Langille, A. Rijsinghani, and K. McCloghrie. Definitions of managed objects for bridges. RFC1493, July 1993.

....set of IP addresses in the subnet corresponding to the IP address of an interface. This enumeration will take into account the subnet masks and the IP address formats. Once D is computed, for each IP address in D, we determine whether it is a switch by checking for the presence of the Bridge MIB [8]. Actually, both routers and switches contain the Bridge MIB and, therefore, we use the value of the ipForwarding variable to determine if an IP address belongs to a switch or a router. If ipForwarding is equal to 1, then the element in question is a router, otherwise it is a switch. At this ....

E. Decker, P. Langille, A. Rijsinghani, and K. McCloghrie, ""Definitions of Managed Objects for Bridges"," Internet RFC-1493 (available from http://www.ietf.org/rfc/), July 1993.

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Decker, E., Langille, P., Rijsinghani, A. and K. McCloghrie, "Definitions of Managed Objects for Bridges", RFC 1493, July 1993.

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Decker, E., Langille, P., Rijsinghani, A., and McCloghrie, K., "Definitions of Managed Objects for Bridges", RFC 1493, cisco Systems, Digital Equipment Corporation, Digital Equipment Corporation, Hughes LAN Systems, July 1993.

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E. Decker, P. Langille, A. Rijsinghani, and K. McCloghrie. Definitions of managed objects for bridges. RFC 1493, IETF, July 1993.

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Decker, E., Langille, P., Rijsinghani, A. and K. McCloghrie, "Definitions of Managed Objects for Bridges", RFC 1493, July 1993.

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Decker, E., Langille, P., Rijsinghani, A. and K. McCloghrie, "Definitions of Managed Objects for Bridges", RFC 1493, July 1993.

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Decker, E. Langille, P., Rijsinghani, A. and K. McCloghrie.. - "Definitions of Managed Objects for Bridges", RFC 1493, July 1993

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Decker, E., Langille, P., Rijsinghani, A. and K. McCloghrie, "Definitions of Managed Objects for Bridges", RFC 1493, July 1993.

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