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SNMP switch probes

SNMP switch probes

These probes return bridging information from VLANs connected across network switches, including port selection, forwarding tables, and the use of the spanning tree protocol.

SNMP - Switch - BridgePortTable

This probe returns all the ports from a switch that are used to create a bridge between network segments.

Table 1. Bridging data returned
TableSwitch Bridge Port Table [dscy_switch_bridge_port_table]
OIDiso.org.dod.internet.mgmt.mib-2.dot1dBridge.dot1dBase.dot1dBasePortTable dot1dBasePort,dot1dBasePortIfIndex
Fields populated
  • cmdb_ci
  • port
  • interface_index

SNMP - Switch - SpanningTreeTable

This probe returns the active path between any two network nodes bridged by a switch.

Table 2. Spanning tree data returned
TableSwitch Spanning Tree Table [dscy_switch_spanning_tree_table]
OIDiso.org.dod.internet.mgmt.mib-2.dot1dBridge.dot1dStp.dot1dStpPortTable dot1dStpPort,dot1dStpPortState,dot1dStpPortEnable,dot1dStpPortDesignatedRoot,dot1dStpPortDesignatedBridge
Fields populated
  • cmdb_ci
  • port
  • port_state
  • port_enable
  • designated_root
  • designated_bridge_mac

SNMP - Switch - ForwardingTable

This probe returns information from a switch's forwarding table.

Table 3. Forwarding table data returned
TableSwitch Forwarding Table [dscy_switch_fwd_table]
OIDsThese OIDs are built as needed by the DiscoveryVlanSwitchProcessor script include.
  • Non-Cisco:
    • Q-BRIDGE MIB: oid_spec_list = 'table iso.org.dod.internet.mgmt.mib-2.dot1dBridge.qBridgeMIB.qBridgeMIBObjects.dot1qTp.dot1qTpFdbTable dot1qTpFdbAddress.' + vlanIndex + ',dot1qTpFdbPort.' + vlanIndex + ',dot1qTpFdbStatus.' + vlanIndex;
    • BRIDGE MIB: oid_spec_list = 'table iso.org.dod.internet.mgmt.mib-2.dot1dBridge.dot1dTp.dot1dTpFdbTable dot1dTpFdbAddress,dot1dTpFdbPort,dot1dTpFdbStatus’;
  • Cisco BRIDGE MIB: oid_spec_list = 'table iso.org.dod.internet.mgmt.mib-2.dot1dBridge.dot1dTp.dot1dTpFdbTable dot1dTpFdbAddress,dot1dTpFdbPort,dot1dTpFdbStatus’;
Additional probe calledSwitch - MAC Table called by DiscoveryVlanSwitchProcessor script include, if needed.
Command

show mac address-table

Fields populated
  • cmdb_ci
  • vlan_id
  • port
  • status
  • mac_address (from the cmdb_ci field in the Network Infrastructure Item [dscy_net_base] table)

SNMP - Switch - Vlan

This probe returns VLAN IDs from a network switch.

Table 4. VLAN data returned
OIDs
  • iso.org.dod.internet.private.enterprises.cisco.ciscoMgmt.ciscoVtpMIB.vtpMIBObjects.vlanInfo.vtpVlanTable vtpVlanState
  • iso.org.dod.internet.private.enterprises.cisco.ciscoMgmt.ciscoVlanMembershipMIB.ciscoVlanMembershipMIBObjects.vmMembership.vmMembershipSummaryTable vmMembershipSummaryVlanIndex,vmMembershipSummaryMemberPorts,vmMembershipSummaryMember2kPorts
  • iso.org.dod.internet.private.enterprises.juniperMIB.jnxMibs.jnxExMibRoot.jnxExSwitching.jnxExVlan.jnxVlanMIBObjects.jnxExVlanTable jnxExVlanTag
  • iso.org.dod.internet.mgmt.mib-2.system.sysDescr

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