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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Important points to remember

Virtual link truncking (VLT) scenario

This section describes how the secondary NAS processes the PE port authorization RADIUS requests to the primary NAS.

  • The NAS VLT chassis member processes the RADIUS dynamic authorization message locally if the role of chassis is primary.
  • The NAS secondary VLT chassis member forwards the RADIUS dynamic authorization message authorizing dual-homed Port Extender (PE) ports to the primary VLT peer. NAS secondary VLT chassis member forwards the response to DAC after receiving it from the primary VLT peer.
  • The NAS VLT secondary chassis member processes the RADIUS dynamic authorization message authorizing non-PE Control Bridge (CB) ports locally.

RPM failover scenario

This section describes how the NAS handles virtual IP failovers to the secondary RPM.

  • The NAS Route Processor Module (RPM) processes the RADIUS dynamic authorization message only if the role of RPM is active.
  • The NAS standby RPM processes the retransmitted CoA or DM messages without requiring a chassis reboot if primary RPM fails and standby becomes primary.

Stack failover scenario

This section describes the stack failover scenario.

  • The NAS stacking module processes the RADIUS dynamic authorization messages only if the role of module is master.
  • The NAS standby stacking module processes the retransmitted CoA or DM messages without requiring a chassis reboot, if the master module fails and the standby module becomes the master.

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