All MIBs › CISCO-IETF-DHCP-SERVER-EXT-MIB › cDhcpv4ServerSubnetFreeAddressLow
cDhcpv4ServerSubnetFreeAddressLow
Module: CISCO-IETF-DHCP-SERVER-EXT-MIB
OID (symbolic): CISCO-IETF-DHCP-SERVER-EXT-MIB::cDhcpv4ServerSubnetFreeAddressLow
OID (numeric): 1.3.6.1.4.1.9.10.122.0.2.0.2
Node type: NOTIFICATION-TYPE
Description: This notification indicates that the number of available IPv4 addresses for a particular subnet has fallen below the corresponding value of cDhcpv4ServerSubnetFreeAddrLowThreshold for that shared network.
Examples
Send this trap to an SNMP manager — replace <manager> with the IP or hostname of your monitoring server (SNMPv2c):
snmptrap -v2c -c public <manager> '' CISCO-IETF-DHCP-SERVER-EXT-MIB::cDhcpv4ServerSubnetFreeAddressLow snmptrap -v2c -c public <manager> '' 1.3.6.1.4.1.9.10.122.0.2.0.2
Listen for incoming traps on the manager host (-f keeps it in the foreground, -Lo prints to stdout — useful for testing):
snmptrapd -f -Lo -c /dev/null authCommunity log public
Example snmptrapd log entry:
zoo11-linux.zoo [UDP: [192.168.30.111]:64961->[192.168.30.10]:162]: DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (13222337) 1 days, 12:43:43.37 SNMPv2-MIB::snmpTrapOID.0 = OID: CISCO-IETF-DHCP-SERVER-EXT-MIB::cDhcpv4ServerSubnetFreeAddressLow
Start monitoring Cisco IOS router/switch configured as a DHCP server with a free 30-day trial of IPNetwork Monitor. Create custom SNMP monitor using the CISCO-IETF-DHCP-SERVER-EXT-MIB::cDhcpv4ServerSubnetFreeAddressLow OID value, configure state conditions and alerts, and monitor any Cisco IOS router/switch configured as a DHCP server from a single console.
OID Breakdown
Upper-level ancestors (8 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.6 | dod | AirPair-MIB |
| 1.3.6.1 | internet | AirPair-MIB |
| 1.3.6.1.4 | private | AirPair-MIB |
| 1.3.6.1.4.1 | enterprises | AirPair-MIB |
| 1.3.6.1.4.1.9 | cisco | CAT2600-MIB |
| 1.3.6.1.4.1.9.10 | ciscoExperiment | CISCO-SMI |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.9.10.122 | ciscoIetfDhcpSrvExtMIB | CISCO-IETF-DHCP-SERVER-EXT-MIB |
| 1.3.6.1.4.1.9.10.122.0 | ciscoIetfDhcpv4SrvExtMIBNotifs | CISCO-IETF-DHCP-SERVER-EXT-MIB |
| 1.3.6.1.4.1.9.10.122.0.2 | cDhcpv4SrvExtNotifyPrefix | CISCO-IETF-DHCP-SERVER-EXT-MIB |
| 1.3.6.1.4.1.9.10.122.0.2.0 | cDhcpv4SrvExtNotify | CISCO-IETF-DHCP-SERVER-EXT-MIB |
| 1.3.6.1.4.1.9.10.122.0.2.0.2 | cDhcpv4ServerSubnetFreeAddressLow | CISCO-IETF-DHCP-SERVER-EXT-MIB |