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IP Routing Features

Configuring IRDP

for the routing switch to the hold time specified in the new advertisement.

If the hold time of an advertisement expires, the host discards the adver-

tisement, 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.

■ maxadvertinterval - This parameter specifies the maximum amount of time

the routing 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.

■ minadvertinterval - This parameter specifies the minimum amount of time

the routing switch can wait between sending Router Advertisements. The

default is three-fourths (0.75) the value of the maxadvertinterval param-

eter. If you change the maxadvertinterval parameter, the software auto-

matically 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.

■ preference < number > - This parameter specifies the IRDP preference level

of this routing switch. If a host receives Router Advertisements from

multiple routers, the host selects the router interface that sent the

message with the highest preference as the host's default gateway. The

valid range is -4294967296 to 4294967295. The default is 0.

Displaying IRDP Information

To display IRDP information, enter show ip irdp from any CLI level.

HPswitch# show ip irdp

Status and Counters - ICMP Router Discovery Protocol

Global Status : Disabled

VLAN Name Status Advertising Min int Max int Holdtime Preference

Address (sec) (sec) (sec)

DEFAULT_VLAN Enabled multicast 450 600 1800 0

VLAN20 Enabled multicast 450 600 1800 0

VLAN30 Enabled multicast 450 600 1800 0

Figure 11-25.Example of Output for Show IP IRDP

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