All MIBs › IPFRR-MIB › ipFrrNoAltCause
ipFrrNoAltCause
Module: IPFRR-MIB
OID (symbolic): IPFRR-MIB::ipFrrNoAltCause
OID (numeric): 1.3.6.1.2.1.4.999.1.3.1.1
Node type: OBJECT-TYPE
Type: INTEGER
Access: read-only
Description: For valid routes without an alternate next-hop, this object enumerates the reason why no protection is available. The possibilities are as follows.
ipFrrUnavailable : The supported IP Fast-Reroute mechanisms could not find a safe alternate next-hop.
localAddress : The route represents a local address. This system is the destination so no alternate path is possible or necessary.
ipFrrDisabled : Finding of alternate next-hops is operationally disabled.
ipFrrUturnDisabled : Finding of u-turn alternate next-hops is operationally disabled. No loop-free alternate could be found. See draft-atlas-ip-local-protect-uturn-02
other : The reason is unknown or different from those specifically enumerated possible causes.
What is ipFrrNoAltCause?
For a valid route that has no alternate next-hop, this reports why - no safe alternate could be found (ipFrrUnavailable), the route is a local address needing no protection, IP FRR is administratively disabled, u-turn protection specifically is disabled, or an other/unknown cause. Admins use this to distinguish nothing-can-be-done cases (like local addresses) from actionable gaps (like FRR being disabled) when working through the list of unprotected routes. If a batch of important routes all show ipFrrNoAltCause as ipFrrDisabled(3), an admin knows simply enabling IP Fast-Reroute, rather than redesigning the topology, would close the protection gap.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.2.1.4.999.1.3.1.1 snmpwalk -v2c -c public <target> IPFRR-MIB::ipFrrNoAltCause
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.2.1.4.999.1.3.1.1.1 snmpget -v2c -c public <target> IPFRR-MIB::ipFrrNoAltCause.1
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OID Breakdown
Upper-level ancestors (7 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 |
| 1.3.6.1.2 | mgmt | APERTUS-NPG-MIB |
| 1.3.6.1.2.1 | mib_2 | AXON-MIB |
| 1.3.6.1.2.1.4 | ip | CHECKPOINT-MIB-2 |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.2.1.4.999 | ipFrrMIB | IPFRR-MIB |
| 1.3.6.1.2.1.4.999.1 | ipFrrMIBObjects | IPFRR-MIB |
| 1.3.6.1.2.1.4.999.1.3 | ipFrrNoAltTable | IPFRR-MIB |
| 1.3.6.1.2.1.4.999.1.3.1 | ipFrrNoAltEntry | IPFRR-MIB |
| 1.3.6.1.2.1.4.999.1.3.1.1 | ipFrrNoAltCause | IPFRR-MIB |