Users Guide
Defaults None
Command Modes POLICY LIST CONFIGURATION
Command History
This guide is platform-specic. For command information about other platforms, see the relevant Dell Networking 
OS Command Line Reference Guide.
Version Description
9.11(0.0) Introduced on the C9010.
9.10(0.0) Introduced on the S6100-ON.
9.9(0.0) Introduced on the Z9500.
9.8(1.0) Introduced on the Z9100-ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000–ON.
9.7(0.0) Introduced on the S4810, S4820T, S5000, S6000, and Z9000 switches.
Related Commands
• ipv6 nd ra-guard enable — congure the RA guard related commands.
• ipv6 nd raguard policy policy-name — dene the router advertisement (RA) guard policy name and enter the 
RA guard policy conguration mode.
reachable–time
Enable the verication of the congured reachability time in the received RA packets.
Syntax
reachable—time value
To reset the advertised reachability time, use the no reachable-timevalue command.
Parameters
value Enter the advertised reachability time in milliseconds. The range is from 0 to 3,600,000 
milliseconds.
Defaults None
Command Modes POLICY LIST CONFIGURATION
Command History
This guide is platform-specic. For command information about other platforms, see the relevant Dell Networking 
OS Command Line Reference Guide.
Version Description
9.11(0.0) Introduced on the C9010.
9.10(0.0) Introduced on the S6100-ON.
9.9(0.0) Introduced on the Z9500.
9.8(1.0) Introduced on the Z9100-ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
Neighbor Discovery Protocol (NDP) 999










