Users Guide

Layer 3 Routing Commands 1827
Router Discovery Protocol
Commands
Dell EMC Networking N3000E-ON/N3100-ON/N3200-ON Series
Switches
Routers can be configured to periodically send router discovery messages to
announce their presence to locally attached hosts. The router discovery
message advertises one or more IP addresses on the router that hosts can use
as their default gateway. Hosts can send a router solicitation message asking
any router that receives the message to immediately send a router
advertisement, so that the host does not have to wait for the next periodic
message.
Router discovery enables hosts to select from among multiple default
gateways and switch to a different default gateway if an initially designated
gateway goes down.
ip irdp
Use the ip irdp command in Interface Configuration mode to enable Router
Discovery on an interface. Use the no form of the command to disable Router
Discovery.
Syntax
ip irdp [multicast | holdtime seconds | maxadvertinterval seconds |
minadvertinterval seconds | preference number | address address]
no ip irdp holdtime
• multicast—Configure the address that the interface uses to send the
router discovery advertisements to be 224.0.0.1, the all-hosts IP multicast
address. Use the no form of the command to use 255.255.255.255, the
limited broadcast address.
• holdtime seconds—Integer value in seconds of the holdtime field of the
router advertisement sent from this interface. (Range: 4-9000 seconds)
• maxadvertinterval seconds—Maximum time in seconds allowed between
sending router advertisements from the interface. (Range: 4 or the
minimum advertisement interval, whichever is greater, and 1800 seconds).