Enabling Irdp Globally - Dell PowerConnect B-RX Configuration Manual

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Enabling IRDP globally

To globally enable IRDP, enter the following command.
BigIron RX(config)# ip irdp
This command enables IRDP on the IP interfaces on all ports. Each port uses the default values for
the IRDP parameters. The parameters are not configurable when IRDP is globally enabled.
Enabling IRDP on an individual port
To enable IRDP on an individual interface and change IRDP parameters, enter commands such as
the following.
BigIron RX(config)# interface ethernet 1/3
BigIron RX(config-if-e10000-1/3)# ip irdp maxadvertinterval 400
This example shows how to enable IRDP on a specific port and change the maximum
advertisement interval for Router Advertisement messages to 400 seconds.
NOTE
To enable IRDP on individual ports, you must leave the feature globally disabled.
Syntax: [no] ip irdp [broadcast | multicast] [holdtime <seconds>] [maxadvertinterval <seconds>]
The broadcast | multicast parameter specifies the packet type the device uses to send Router
Advertisement.
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The holdtime <seconds> parameter specifies how long a host that receives a Router
Advertisement from the device should consider the advertisement to be valid. When a host
receives a new Router Advertisement message from the device, the host resets the hold time for
the device to the hold time specified in the new advertisement. If the hold time of an advertisement
expires, the host discards the advertisement, concluding that the router interface that sent the
advertisement is no longer available. The value must be greater than the value of the
maxadvertinterval parameter and cannot be greater than 9000. The default is three times the
value of the maxadvertinterval parameter.
BigIron RX Series Configuration Guide
53-1002253-01
Hold time – Each Router Advertisement message contains a hold time value. This value
specifies the maximum amount of time the host should consider an advertisement to be valid
until a newer advertisement arrives. When a new advertisement arrives, the hold time is reset.
The hold time is always longer than the maximum advertisement interval. Therefore, if the
hold time for an advertisement expires, the host can reasonably conclude that the router
interface that sent the advertisement is no longer available. The default hold time is three
times the maximum message interval.
Preference – If a host receives multiple Router Advertisement messages from different
routers, the host selects the router that sent the message with the highest preference as the
default gateway. The preference can be a number from 4294967296 to 4294967295. The
default is 0.
[minadvertinterval <seconds>] [preference <number>]
broadcast – The device sends Router Advertisement as IP broadcasts. This is the default.
multicast – The device sends Router Advertisement as multicast packets addressed to IP
multicast group 224.0.0.1.
Configuring forwarding parameters
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