Description

NSE will conduct mock trading sessions from Primary and BCP/DR sites on December 20, 2025, followed by a re-login session to avoid login issues on December 22, 2025.

Summary

NSE will conduct a mock trading session on Saturday, December 20, 2025 from both Primary and BCP/DR sites to test business continuity and disaster recovery systems. The mock will include two trading sessions followed by a re-login session from the Primary site to prevent login problems on Monday, December 22, 2025. All members are required to participate.

Key Points

  • Mock trading scheduled for Saturday, December 20, 2025 with two sessions
  • Session 1 from Primary Site: 09:00 to 12:00 (pre-open 09:00-09:08, market 09:15-12:00)
  • Session 2 from BCP Site: 12:45 to 15:30 (pre-open 12:45-12:53, market 13:00-15:30)
  • Re-login session from Primary Site: 18:30 to 19:00
  • Non-graceful shutdown will occur when switching from Primary to DR site
  • All outstanding orders will be purged before BCP site trading starts
  • No changes required in NEAT Adapter settings from Friday, December 19, 2025
  • Multicast TBT sequence numbers will restart from ‘1’ when trading from BCP site
  • NEAT version supported: NEATPlus 7.8.7 & 7.8.6
  • Trade modification allowed until 16:15

Regulatory Changes

No regulatory changes introduced. This is a scheduled mock trading exercise to test disaster recovery infrastructure as per existing SEBI requirements for business continuity planning.

Compliance Requirements

  • Members must participate in all three sessions (Primary mock, BCP mock, and re-login)
  • Members using NNF software must manually clear outstanding orders from Session 1 before trading from BCP site
  • Members should follow procedures outlined in circular NSE/MSD/48662 dated June 18, 2021 to bring systems into consistent state after non-graceful shutdown
  • Members must refer to installation guide available on NSE Extranet at /faoftp/faocommon/Installation_Procedure
  • Colo participants should note different latencies on DR/BCP day compared to normal trading
  • Members should comply with SEBI circular SEBI/HO/MRD1/DSAP/CIR/P/2020/234 regarding software testing requirements

Important Dates

  • December 19, 2025: Circular issued; retain NEAT Adapter settings from this date
  • December 20, 2025:
    • 09:00-12:00: Mock trading from Primary Site
    • 12:45-15:30: Mock trading from BCP Site
    • 16:15: Trade modification end time
    • 18:30-19:00: Re-login session from Primary Site
  • December 22, 2025: Normal trading resumes on Monday

Impact Assessment

Operational Impact: Medium - All F&O members must participate in the mock sessions and ensure their systems can handle the switchover from Primary to DR site. The non-graceful shutdown requires members to take specific actions to maintain system consistency.

Market Impact: Low - No financial obligations arise from mock trading; no actual fund pay-in or pay-out will occur. This is purely a systems testing exercise.

Technical Impact: Medium - Members need to ensure their systems can handle order purging, sequence number resets, and different latencies. Colo participants will experience different latencies during DR operations.

Member Preparedness: The mock session tests critical business continuity infrastructure and ensures members can continue operations in case of actual disaster recovery scenarios.

Impact Justification

Mandatory mock trading session for testing BCP/DR infrastructure; affects all F&O members but is scheduled exercise with no financial obligations