SNMP Discovery Options and OIDs
This page describes the behavior associated with SNMP discovery options and the data provided from each selection.
SNMP Discovery Options
When creating a collector, a user is given the option to enable SNMP discovery. Below are examples of the options available and detailed behavior. SNMP discovery happens in two steps. In the first, the system tests all qualified addresses with the provided SNMP credentials. Once Asset Manager has enumerated the responsive SNMP credentials the system then gathers detailed SNMP data using the first (as determined by the order of the configured SNMP credentials) responsive credential. Asset Manager gathers different SNMP OIDs based primarily on the scan configuration. The main configuration options are:
- “Collect interface data”
- “Collect layer2 data"
- “Collect routes”
- “Collect Entity and Host Resource MIB data”
You need to select “Collect interface data” in order to do any other scanning. The OIDs Asset Manager gathers are dynamically adjusted based on the data already collected for a given address. Asset Manager requests OIDs in the order of the “Order” column shown in the table below. Typically the latest RFCs are requested, then older ones if the latest is not available. Asset Manager performs a getBulk for the items listed below unless there’s a “singleton” flag (in which case we do a getNext). The “unscheduled” flag means Asset Manager doesn't ask for that OID unless we schedule that OID based on the results from previous OIDs. The underlying code schedules and unschedules other OIDs as scanning progresses. For any given device, Asset Manager will gather some subset of the OIDs in each table below (only querying OIDs from the tables referenced by the individual SNMP checkboxes).
Collect Interface Data
This option gets us the bulk of the information. It’s not just interfaces but also the equivalent of the ARP cache information, serial numbers, and system information.
| Name | OID | Order | Flags |
|---|---|---|---|
| cvVrfName | 1.3.6.1.4.1.9.9.711.1.1.1.1.2 | 1 | No Flags |
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| cContextMappingVrfName | 1.3.6.1.4.1.9.9.468.1.1.1.2 | 2 | No Flags |
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| cContextMappingVacmContextName | 1.3.6.1.4.1.9.9.468.1.1.1.1 | 3 | unscheduled |
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| cContextMappingTopologyName | 1.3.6.1.4.1.9.9.468.1.1.1.3 | 4 | unscheduled |
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| cContextMappingProtoInstName | 1.3.6.1.4.1.9.9.468.1.1.1.4 | 5 | unscheduled |
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| system | 1.3.6.1.2.1.1 | 8 | No Flags |
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| entPhysicalSerialNum | 1.3.6.1.2.1.47.1.1.1.1.11 | 9 | singleton |
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| jnxBoxSerialNo | 1.3.6.1.4.1.2636.3.1.3 | 10 | singleton |
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| prtGeneralSerialNumber | 1.3.6.1.2.1.43.5.1.1.17 | 11 | singleton |
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| ifNumber | 1.3.6.1.2.1.2.1 | 12 | singleton |
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| ifIndex | 1.3.6.1.2.1.2.2.1.1 | 13 | interface |
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| ifDescr | 1.3.6.1.2.1.2.2.1.2 | 14 | interface |
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| ifName | 1.3.6.1.2.1.31.1.1.1.1 | 15 | interface |
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| ifType | 1.3.6.1.2.1.2.2.1.3 | 16 | interface |
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| ifAlias | 1.3.6.1.2.1.31.1.1.1.18 | 17 | interface |
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| ifPhysAddress | 1.3.6.1.2.1.2.2.1.6 | 18 | interface |
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| ifAdminStatus | 1.3.6.1.2.1.2.2.1.7 | 19 | interface |
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| ifOperStatus | 1.3.6.1.2.1.2.2.1.8 | 20 | interface |
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| ipForwarding | 1.3.6.1.2.1.4.1 | 21 | singleton |
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| ipv6Forwarding | 1.3.6.1.2.1.55.1.1 | 22 | singleton |
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| ipv6IpForwarding | 1.3.6.1.2.1.4.25 | 23 | No Flags |
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| dot11StationID | 1.2.840.10036.1.1.1.1 | 24 | singleton |
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| ipv6Interfaces | 1.3.6.1.2.1.55.1.3 | 25 | singleton |
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| ipv6IfDescr | 1.3.6.1.2.1.55.1.5.1.2 | 26 | interface |
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| ipv6IfAdminStatus | 1.3.6.1.2.1.55.1.5.1.9 | 27 | interface |
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| ipv6IfOperStatus | 1.3.6.1.2.1.55.1.5.1.10 | 28 | interface |
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| ipAddressPrefix | 1.3.6.1.2.1.4.34.1.5 | 29 | interface |
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| ipAddressIfIndex | 1.3.6.1.2.1.4.34.1.3 | 30 | interface |
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| ipAddressType | 1.3.6.1.2.1.4.34.1.4 | 31 | interface |
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| ipv6AddrPfxLength | 1.3.6.1.2.1.55.1.8.1.2 | 32 | interface |
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| ipAdEntIfIndex | 1.3.6.1.2.1.4.20.1.2 | 33 | interface,unscheduled |
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| ciiIPIfAddressPrefixLength | 1.3.6.1.4.1.9.9.309.1.1.3.1.1 | 34 | interface,unscheduled |
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| ipAdEntNetMask | 1.3.6.1.2.1.4.20.1.3 | 35 | unscheduled,interface |
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| ipNetToPhysicalPhysAddress | 1.3.6.1.2.1.4.35.1.4 | 36 | host |
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| ipNetToMediaPhysAddress | 1.3.6.1.2.1.4.22.1.2 | 37 | unscheduled,host |
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| ipv6NetToMediaPhysAddress | 1.3.6.1.2.1.55.1.12.1.2 | 38 | host |
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| bgpLocalAs | 1.3.6.1.2.1.15.2 | 39 | singleton |
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Collect Layer2 Data
This option gathers layer-2 In this table, if we hear from a Cisco device we unschedule all the “noncisco” items.
| Name | OID | Order | Flags |
|---|---|---|---|
| lldpRemManAddrIfId | 1.0.8802.1.1.2.1.4.2.1.4 | 7 | layer2 |
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| vtpVlanName | 1.3.6.1.4.1.9.9.46.1.3.1.1.4 | 65 | layer2 |
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| vlanTrunkPortDynamicStatus | 1.3.6.1.4.1.9.9.46.1.6.1.1.14 | 66 | layer2 |
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| vmMembershipSummaryMember2kPorts | 1.3.6.1.4.1.9.9.68.1.2.1.1.3 | 67 | layer2 |
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| vmPortStatus | 1.3.6.1.4.1.9.9.68.1.2.2.1.3 | 68 | layer2 |
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| vmVlan | 1.3.6.1.4.1.9.9.68.1.2.2.1.2 | 69 | layer2 |
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| vmVoiceVlanId | 1.3.6.1.4.1.9.9.68.1.5.1.1.1 | 70 | layer2 |
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| dot1dBaseBridgeAddress | 1.3.6.1.2.1.17.1.1 | 71 | layer2,singleton |
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| dot1dStpDesignatedRoot | 1.3.6.1.2.1.17.2.5 | 72 | layer2,singleton |
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| dot1dStpRootPort | 1.3.6.1.2.1.17.2.7 | 73 | layer2,singleton |
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| dot1dBasePort | 1.3.6.1.2.1.17.1.4.1.1 | 74 | layer2 |
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| dot1dBasePortIfIndex | 1.3.6.1.2.1.17.1.4.1.2 | 75 | ciscoindexed,layer2 |
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| dot1dStpPortDesignatedBridge | 1.3.6.1.2.1.17.2.15.1.8 | 76 | ciscoindexed,layer2 |
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| dot1dStpPortDesignatedPort | 1.3.6.1.2.1.17.2.15.1.9 | 77 | ciscoindexed,layer2 |
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| dot1dTpFdbAddress | 1.3.6.1.2.1.17.4.3.1.1 | 78 | ciscoindexed,layer2 |
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| dot1dTpFdbPort | 1.3.6.1.2.1.17.4.3.1.2 | 79 | ciscoindexed,layer2 |
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| dot1dTpFdbStatus | 1.3.6.1.2.1.17.4.3.1.3 | 80 | ciscoindexed,layer2 |
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| dot1qTpFdbPort | 1.3.6.1.2.1.17.7.1.2.2.1.2 | 81 | layer2,unscheduled |
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| dot1qTpFdbStatus | 1.3.6.1.2.1.17.7.1.2.2.1.3 | 82 | layer2,unscheduled |
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| dot1qVlanStaticName | 1.3.6.1.2.1.17.7.1.4.3.1.1 | 83 | layer2 |
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| dot1qVlanStaticEgressPorts | 1.3.6.1.2.1.17.7.1.4.3.1.2 | 84 | layer2 |
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| dot1qPvid | 1.3.6.1.2.1.17.7.1.4.5.1.1 | 85 | layer2 |
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| cdpCacheAddress | 1.3.6.1.4.1.9.9.23.1.2.1.1.4 | 86 | layer2 |
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| cdpCacheAddressType | 1.3.6.1.4.1.9.9.23.1.2.1.1.3 | 87 | layer2 |
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| ctCDPNeighborIP | 1.3.6.1.4.1.52.4.1.2.19.1.3.1.3 | 88 | noncisco,layer2 |
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| ctCDPNeighborType | 1.3.6.1.4.1.52.4.1.2.19.1.3.1.5 | 89 | noncisco,layer2 |
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| s5EnMsTopIpAddr | 1.3.6.1.4.1.45.1.6.13.1.1 | 90 | noncisco,layer2 |
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| s5EnMsTopNmmPort | 1.3.6.1.4.1.45.1.6.13.2.1.1.2 | 91 | noncisco,layer2 |
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| s5EnMsTopNmmIpAddr | 1.3.6.1.4.1.45.1.6.13.2.1.1.3 | 92 | noncisco,layer2 |
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| s5EnMsTopBdgIpAddr | 1.3.6.1.4.1.45.1.6.13.3.1.1.3 | 93 | noncisco,layer2 |
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| extremeEdpPortIfIndex | 1.3.6.1.4.1.1916.1.13.2.1.1 | 94 | noncisco,layer2 |
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| extremeEdpNeighborId | 1.3.6.1.4.1.1916.1.13.2.1.2 | 95 | noncisco,layer2 |
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| extremeEdpNeighborVlanName | 1.3.6.1.4.1.1916.1.13.3.1.1 | 96 | noncisco,layer2 |
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| extremeEdpNeighborVlanIpAddress | 1.3.6.1.4.1.1916.1.13.3.1.3 | 97 | noncisco,layer2 |
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| extremeEdpNeighborVlanId | 1.3.6.1.4.1.1916.1.13.3.1.2 | 98 | noncisco,layer2 |
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| snFdpCacheAddress | 1.3.6.1.4.1.1991.1.1.3.20.1.2.1.1.5 | 99 | noncisco,layer2 |
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| jnxExVlanName | 1.3.6.1.4.1.2636.3.40.1.5.1.5.1.2 | 100 | noncisco,layer2 |
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| jnxExVlanTag | 1.3.6.1.4.1.2636.3.40.1.5.1.5.1.5 | 101 | noncisco,layer2,unscheduled |
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| jnxExVlanSnmpIfIndex | 1.3.6.1.4.1.2636.3.40.1.5.1.6.1.8 | 105 | noncisco,layer2,unscheduled |
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Collect Routes
If “Skip BGP routes” is checked and if we get a non-zero result for the bgpLocalAs OID we will skip gathering routes. If “Maximum route table size” is configured and if we exceed that number of routes (either by getting a route count line inetCidrRouteNumber or by collecting that many routes), we stop gathering routes (and discard any we may have gathered (so as to not gather inconsistent, partial data).
| Name | OID | Order | Flags |
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| inetCidrRouteNumber | 1.3.6.1.2.1.4.24.6 | 40 | singleton,routeoid |
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| inetCidrRouteIfIndex | 1.3.6.1.2.1.4.24.7.1.7 | 41 | routeoid |
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| inetCidrRouteType | 1.3.6.1.2.1.4.24.7.1.8 | 42 | routeoid,unscheduled |
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| inetCidrRouteProto | 1.3.6.1.2.1.4.24.7.1.9 | 43 | routeoid,unscheduled |
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| ipCidrRouteNumber | 1.3.6.1.2.1.4.24.3 | 44 | singleton,routeoid |
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| ipCidrRouteMask | 1.3.6.1.2.1.4.24.4.1.2 | 45 | routeoid |
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| ipCidrRouteNextHop | 1.3.6.1.2.1.4.24.4.1.4 | 46 | routeoid,unscheduled |
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| ipCidrRouteInstance | 1.3.6.1.2.1.4.24.4.1.1 | 47 | routeoid,unscheduled |
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| ipCidrRouteIfIndex | 1.3.6.1.2.1.4.24.4.1.5 | 48 | routeoid,unscheduled |
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| ipCidrRouteType | 1.3.6.1.2.1.4.24.4.1.6 | 49 | routeoid,unscheduled |
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| ipCidrRouteProto | 1.3.6.1.2.1.4.24.4.1.7 | 50 | routeoid,unscheduled |
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| ipRouteMask | 1.3.6.1.2.1.4.21.1.11 | 51 | routeoid |
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| ipRouteNextHop | 1.3.6.1.2.1.4.21.1.7 | 52 | routeoid,unscheduled |
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| ipRouteIfIndex | 1.3.6.1.2.1.4.21.1.2 | 53 | routeoid,unscheduled |
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| ipRouteType | 1.3.6.1.2.1.4.21.1.8 | 54 | routeoid,unscheduled |
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| ipRouteProto | 1.3.6.1.2.1.4.21.1.9 | 55 | routeoid,unscheduled |
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| ipv6RouteNumber | 1.3.6.1.2.1.55.1.9 | 56 | singleton,routeoid |
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| ipv6RouteIfIndex | 1.3.6.1.2.1.55.1.11.1.4 | 57 | routeoid |
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| ipv6RouteNextHop | 1.3.6.1.2.1.55.1.11.1.5 | 58 | routeoid,unscheduled |
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| ipv6RouteType | 1.3.6.1.2.1.55.1.11.1.6 | 59 | routeoid,unscheduled |
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| ipv6RouteProtocol | 1.3.6.1.2.1.55.1.11.1.7 | 60 | routeoid,unscheduled |
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| mplsVpnVrfRouteProto | 1.3.6.1.3.118.1.4.1.1.10 | 61 | routeoid |
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| mplsVpnVrfRouteDestAddrType | 1.3.6.1.3.118.1.4.1.1.2 | 62 | routeoid,unscheduled |
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| mplsVpnVrfRouteType | 1.3.6.1.3.118.1.4.1.1.9 | 63 | routeoid,unscheduled |
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| mplsVpnVrfRouteIfIndex | 1.3.6.1.3.118.1.4.1.1.8 | 64 | routeoid,unscheduled |
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Collect Entity & Host Resource MIB data
If “Collect Entity and Host Resource MIB data” is checked we gather Entity-MIB data and various things about host resources and VMWare server inventory
| Name | OID | Order | Flags |
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| entityPhysical | 1.3.6.1.2.1.47.1.1 | 102 | entitymib |
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| hrSWInstalledName | 1.3.6.1.2.1.25.6.3.1.2 | 103 | entitymib |
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| hrSWInstalledDate | 1.3.6.1.2.1.25.6.3.1.5 | 104 | entitymib,unscheduled |
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| vmwVMDisplayName | 1.3.6.1.4.1.6876.2.1.1.2 | 106 | entitymib |
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| vmwVMGuestOs | 1.3.6.1.4.1.6876.2.1.1.4 | 107 | entitymib,unscheduled |
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| vmwVMMemSize | 1.3.6.1.4.1.6876.2.1.1.5 | 108 | entitymib,unscheduled |
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| vmwVMGuestState | 1.3.6.1.4.1.6876.2.1.1.8 | 109 | entitymib,unscheduled |
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| vmwVMCpus | 1.3.6.1.4.1.6876.2.1.1.9 | 110 | entitymib,unscheduled |
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| vmwVMMAC | 1.3.6.1.4.1.6876.2.4.1.7 | 111 | entitymib,unscheduled |
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