Network Management
Indirect Discovery (Neighbor Scanning) in IPAM
This topic explains how IPAM obtains an ARP table from device. Indirect Discovery (Neighbor Scanning) in IPAM. The IPAM feature Neighbor Scanning attempts to retrieve the status of a device that may not be responding to ICMP by scanning the ARP table of a neighbor router to see which IP addresses are active.
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Neighbor Scanning in IPAM attempts to retrieve the status of a device that may not be responding to ICMP by scanning the ARP table of a neighbor router to see which IP addresses are active.
IPAM first checks if the device is capable of SNMP and supports ARP table:
To check whether SNMP is available, IPAM uses these OIDs:
| OidSysContact | 1.3.6.1.2.1.1.4.0 | iso.org.dod.internet.mgmt.mib-2.system.sysContact.0 |
To check whether the ARP table is available:
| OidIPNetToMediaTable | 1.3.6.1.2.1.4.22 | iso.org.dod.internet.mgmt.mib-2.ip.ipNetToMediaTable |
The IPNetToMediaTable is pulled for client information. If the device supports this table, then IPAM can work with it.
Under the 1.3.6.1.2.1.4.22 OID IPAM will poll the following subsidary OIDs:
| 1.3.6.1.2.1.4.22.1.1 | ipNetToMediaIfIndex |
| 1.3.6.1.2.1.4.22.1.2 | ipNetToMediaPhysAddress |
| 1.3.6.1.2.1.4.22.1.3 | ipNetToMediaNetAddress |
| 1.3.6.1.2.1.4.22.1.4 | ipNetToMediaType |
A null return indicates the device does not support that MIB.