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ICMP Router Discovery Advertisements (CR00010614) 160

Version 291-18

C613-10488-00 REV Q

Advertisement interval

The router advertisement interval is the time between router advertisements. For the first few advertisements sent from an interface (up to 3), the router or

switch sends the router advertisements at intervals of at most 16 seconds. After these initial transmissions, it sends router advertisements at random intervals

between the minimum and maximum intervals that the user configures, to reduce the probability of synchronization with the advertisements from other

routers on the same link. By default the minimum is 450 seconds (7.5 minutes), and the maximum is 600 seconds (10 minutes).

Preference level

The preference level is the preference of the advertised address as a default router address relative to other router addresses on the same subnet. By default, all

routers and layer 3 switches have the same preference level, zero. While it is entered as a decimal from -2147483648 to 2147483647, it is encoded in router

advertisements as a twos-complement hex integer from 0x8000000 to 0x7fffffff. A higher preference level is preferred over a lower value.

Lifetime

The lifetime of a router advertisement is how long the information in the advertisement is valid. By default, the lifetime of all advertisements is 1800 seconds (30

minutes).

Configuration procedure

Do the following to configure the router or switch to send router advertisements.

1. Set the physical interface to advertise.

For each physical interface that is to send advertisements, add the interface. In most cases the default advertising parameters work well, but you can

change them if required. By default, the router or switch sends advertisements every 7.5 to 10 minutes, with a lifetime of 30 minutes. These settings are

likely to work in most situations and not cause extra traffic, even if there are several routers or switches on the LAN. If you change these settings, keep the

following proportions:

lifetime=3 x maxadvertisementinterval

minadvertisementinverval=0.75 x maxadvertisementinterval

To change these settings, use one of the commands:

add ip advertise interface=interface [advertisementaddress={all|limited}] [maxadvertisementinterval=4..1800]

[minadvertisementinterval=3..maxadvertisementinterval] [lifetime=maxadvertisementinterval..9000]

set ip advertise interface=interface [advertisementaddress={all|limited}] [maxadvertisementinterval=4..1800]

[minadvertisementinterval=3..maxadvertisementinterval] [lifetime=maxadvertisementinterval..9000]

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