All MIBs › CISCOSB-IPV6FHS-MIB › rlFirstHopSecCountersDropNdpNS
rlFirstHopSecCountersDropNdpNS
Module: CISCOSB-IPV6FHS-MIB
OID (symbolic): CISCOSB-IPV6FHS-MIB::rlFirstHopSecCountersDropNdpNS
OID (numeric): 1.3.6.1.4.1.9.6.1.101.215.1.8.1.9
Node type: OBJECT-TYPE
Type: Counter32
Access: read-only
Description: Number of NDP Neighbor Solicitation messages dropped on the interface.
What is rlFirstHopSecCountersDropNdpNS?
This read-only Counter32 tallies the number of NDP Neighbor Solicitation messages dropped on the interface since the counter was last reset. An admin cares because Neighbor Solicitations blocked by FHS, which can explain intermittent IPv6 reachability issues if the count is high, so watching this counter helps spot attacks, misconfigured neighboring devices, or an overly strict policy. For example, if this counter on port Gi1/0/3 climbs rapidly right after a new device joins the LAN, it is a strong clue that device is the source of the offending IPv6 traffic on that link.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.9.6.1.101.215.1.8.1.9 snmpwalk -v2c -c public <target> CISCOSB-IPV6FHS-MIB::rlFirstHopSecCountersDropNdpNS
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.9.6.1.101.215.1.8.1.9.1 snmpget -v2c -c public <target> CISCOSB-IPV6FHS-MIB::rlFirstHopSecCountersDropNdpNS.1
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OID Breakdown
Upper-level ancestors (10 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 |
| 1.3.6.1.4.1.9.6 | otherEnterprises | CISCO-SMI |
| 1.3.6.1.4.1.9.6.1 | ciscoSB | CISCO-SMI |
| 1.3.6.1.4.1.9.6.1.101 | switch001 | CISCOSB-MIB |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.9.6.1.101.215 | rlIpv6Fhs | CISCOSB-IPV6FHS-MIB |
| 1.3.6.1.4.1.9.6.1.101.215.1 | rlFirstHopSec | CISCOSB-IPV6FHS-MIB |
| 1.3.6.1.4.1.9.6.1.101.215.1.8 | rlFirstHopSecCountersTable | CISCOSB-IPV6FHS-MIB |
| 1.3.6.1.4.1.9.6.1.101.215.1.8.1 | rlFirstHopSecCountersEntry | CISCOSB-IPV6FHS-MIB |
| 1.3.6.1.4.1.9.6.1.101.215.1.8.1.9 | rlFirstHopSecCountersDropNdpNS | CISCOSB-IPV6FHS-MIB |