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834 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Configuring IP parameters – Layer 3 Switches
26
Enabling IRDP on an individual port
To enable IRDP on an individual interface and change IRDP parameters, enter commands such as
the following.
PowerConnect(config)# interface ethernet 1/3
PowerConnect(config-if-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>]
[minadvertinterval <seconds>] [preference <number>]
The broadcast | multicast parameter specifies the packet type the Layer 3 Switch uses to send
Router Advertisement:
• broadcast – The Layer 3 Switch sends Router Advertisement as IP broadcasts. This is the
default.
• multicast – The Layer 3 Switch sends Router Advertisement as multicast packets addressed to
IP multicast group 224.0.0.1.
The holdtime <seconds> parameter specifies how long a host that receives a Router
Advertisement from the Layer 3 Switch should consider the advertisement to be valid. When a host
receives a new Router Advertisement message from the Layer 3 Switch, the host resets the hold
time for the Layer 3 Switch 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.
The maxadvertinterval parameter specifies the maximum amount of time the Layer 3 Switch waits
between sending Router Advertisements. You can specify a value from 1 to the current value of the
holdtime parameter. The default is 600 seconds.
The minadvertinterval parameter specifies the minimum amount of time the Layer 3 Switch can
wait between sending Router Advertisements. The default is three-fourths (0.75) the value of the
maxadvertinterval parameter. If you change the maxadvertinterval parameter, the software
automatically adjusts the minadvertinterval parameter to be three-fourths the new value of the
maxadvertinterval parameter. If you want to override the automatically configured value, you can
specify an interval from 1 to the current value of the maxadvertinterval parameter.
The preference <number> parameter specifies the IRDP preference level of this Layer 3 Switch. If
a host receives Router Advertisements from multiple routers, the host selects the router interface
that sent the message with the highest interval as the host default gateway. The valid range is
0-4294967296 to 0-4294967295. The default is 0.
Configuring RARP
The Reverse Address Resolution Protocol (RARP) provides a simple mechanism for
directly-attached IP hosts to boot over the network. RARP allows an IP host that does not have a
means of storing its IP address across power cycles or software reloads to query a directly-attached
router for an IP address.