ISIS-MIB :: isisSysID

MIB Reference — IPNetwork Monitor · Updated October 06, 2026

All MIBs › ISIS-MIB › isisSysID

isisSysID

Module: ISIS-MIB

OID (symbolic): ISIS-MIB::isisSysID

OID (numeric): 1.3.6.1.2.1.138.1.1.1.3

Node type: OBJECT-TYPE

Type: IsisSystemID

Access: read-write

Description: The ID for this Intermediate System. This value is appended to each of the area addresses to form the Network Entity Titles. The derivation of a value for this object is implementation specific. Some implementations may automatically assign values and not permit an SNMP write, while others may require the value to be set manually.

Configured values MUST survive an agent reboot.

What is isisSysID?

The System ID that identifies this router within IS-IS, appended to area addresses to form its full Network Entity Title. Some implementations derive it automatically (often from a MAC or loopback address); others require it to be set manually, and once set it must persist across reboots.

Examples

Walk all instances (SNMPv2c):

snmpwalk -v2c -c public <target> 1.3.6.1.2.1.138.1.1.1.3
snmpwalk -v2c -c public <target> ISIS-MIB::isisSysID

Get a specific instance (index 1):

snmpget -v2c -c public <target> 1.3.6.1.2.1.138.1.1.1.3.1
snmpget -v2c -c public <target> ISIS-MIB::isisSysID.1

Set instance 1 (SNMPv2c):

snmpset -v2c -c private <target> 1.3.6.1.2.1.138.1.1.1.3.1 s <value>

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OID Breakdown

Upper-level ancestors (6 from the standard OID tree / other modules)
Numeric OIDNameModule
1isoLANART-AGENT
1.3orgAirPair-MIB
1.3.6dodAirPair-MIB
1.3.6.1internetAirPair-MIB
1.3.6.1.2mgmtAPERTUS-NPG-MIB
1.3.6.1.2.1mib_2AXON-MIB
Numeric OIDNameModule
1.3.6.1.2.1.138isisMIBISIS-MIB
1.3.6.1.2.1.138.1isisObjectsISIS-MIB
1.3.6.1.2.1.138.1.1isisSystemISIS-MIB
1.3.6.1.2.1.138.1.1.1isisSysObjectISIS-MIB
1.3.6.1.2.1.138.1.1.1.3isisSysIDISIS-MIB