DC-ISIS-MIB :: isisSysCalcSoonAfterCircChange

MIB Reference — IPNetwork Monitor · Updated October 05, 2026

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isisSysCalcSoonAfterCircChange

Module: DC-ISIS-MIB

OID (symbolic): DC-ISIS-MIB::isisSysCalcSoonAfterCircChange

OID (numeric): 1.2.826.0.1.1578918.5.63.1.1.1.1.1.49

Node type: OBJECT-TYPE

Type: TruthValue

Access: read-create

Description: Set this object to 'true' to minimize the delay before triggering a routing calculation that includes any relevant circuit change. This means a change to the local neighbors (including pseudonodes), or to the reachable addresses received from the I3 stub.

There are two aspects to minimizing the delay.

- DC-ISIS overrides the setting of the isisSysLevelMinLSPGenInt object when such a change occurs, and usually regenerates the local LSP(s) immediately. The only exception is when DC-ISIS is performing restart procedures as defined in RFC3847. This RFC specifies when DC-ISIS can update the local LSP during a restart.

- DC-ISIS overrides all of the objects that affect the scheduling of routing calculations, with the exception of the isisSysCalcThrshRestartLimit object. It ensures that a routing calculation including the updated LSPs takes place as soon as possible. It abandons an existing route calculation if necessary, unless more than isisSysCalcThrshRestartLimit successive calculations would have been interrupted.

What is isisSysCalcSoonAfterCircChange?

When true (the default), minimizes the delay before triggering a routing recalculation whenever a relevant local circuit changes (new/lost neighbors, pseudonodes, or reachable addresses from the I3 stub): it overrides isisSysLevelMinLSPGenInt to regenerate the local LSP(s) immediately (except during an active RFC 3847 restart) and overrides the scheduling objects governing calculation delay (except isisSysCalcThrshRestartLimit) so the recalculation happens as soon as possible, even interrupting an in-progress calculation if needed. An admin would disable this only to intentionally slow convergence reaction to local circuit flaps, which is unusual outside specific tuning scenarios.

OID Breakdown

Upper-level ancestors (6 from the standard OID tree / other modules)
Numeric OIDNameModule
1isoLANART-AGENT
1.2member_bodyIEEE802dot11-MIB
1.2.826gbMETASWITCH-MIB
1.2.826.0gbNationalMETASWITCH-MIB
1.2.826.0.1gbNatCompanyMETASWITCH-MIB
1.2.826.0.1.1578918dataConnectionMETASWITCH-MIB
Numeric OIDNameModule
1.2.826.0.1.1578918.5.63.1dcIsisMibDC-ISIS-MIB
1.2.826.0.1.1578918.5.63.1.1isisObjectsDC-ISIS-MIB
1.2.826.0.1.1578918.5.63.1.1.1isisSystemDC-ISIS-MIB
1.2.826.0.1.1578918.5.63.1.1.1.1isisSysTableDC-ISIS-MIB
1.2.826.0.1.1578918.5.63.1.1.1.1.1isisSysEntryDC-ISIS-MIB
1.2.826.0.1.1578918.5.63.1.1.1.1.1.49isisSysCalcSoonAfterCircChangeDC-ISIS-MIB