Cisco Nexus 7000 Series, Command Reference Manual

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router-preference maximum
To verify the advertised default router preference parameter value, use the router-preference maximum
command in RA guard policy configuration mode.
router-preference maximum { high| low| medium }
Syntax Description
Default router preference parameter value is higher
than the specified limit. high
Default router preference parameter value is equal to
the specified limit.
medium
Default router preference parameter value is lower
than the specified limit. low
Command Default
The router preference maximum value is not configured.
Command Modes
RA guard policy configuration (config-ra-guard)
Command History
Modification Release
This command was introduced. 8.0(1)
Usage Guidelines
The router-preference maximum command enables verification that the advertised default router preference
parameter value is lower than or equal to a specified limit. You can use this command to give a lower priority
to default routers advertised on trunk ports, and to give precedence to default routers advertised on access
ports.
The router-preference maximum command limit are high, medium, or low. If, for example, this value is
set to medium and the advertised default router preference is set to high in the received packet, then the packet
is dropped. If the command option is set to medium or low in the received packet, then the packet is not
dropped.
Examples
The following example shows how the command defines a router advertisement (RA) guard policy name as
raguard1, places the router in RA guard policy configuration mode, and configures router-preference maximum
verification to be high:
switch(config)#
ipv6 nd raguard policy raguard1
switch(config-ra-guard)# router-preference maximum high
Cisco Nexus 7000 Series Security Command Reference
632
R Commands
router-preference maximum