IRDP can use either multicast and broadcast. Obviously it makes more sense
to use multicast if the routers and hosts support it. Cisco and Nortel
routers can be configured to use either. Windows OS can be configured to
listen to either broadcast or multicast.
I used IRDP to provide fault tolerance in a mixed vendors environment, where
it is not possible to use either HSRP or VRRP. The problem with configuring
a workstation with multiple gateways, instead of using IRDP, is that the TCP
Dead Gateway Detection process relies on TCP timing out on a default
gateway, before switching to the secondary gateway. In a typical user
environment, this can take a very very long time, at times a network admin
would have to perform an operation that will trigger the dead gateway
detection (such as telnet to the dead router).
Manipulating the IRDP timers is crucial to a transparent fault tolerance
environment, without cluttering the bandwidth with unecessary IRDP
broadcast/multicast.
CM
> -----Original Message-----
> From: Kim Edward B [mailto:[EMAIL PROTECTED]]
> Sent: 13 June 2001 23:55
> To: [EMAIL PROTECTED]
> Subject: RE: IRDP, why isn't it used more often [7:8425]
>
>
> I agree on the 'not natively implemented in the most common
> o/s' part' but
> doesn't IRDP use Multicast instead of Broadcast?
> I know that IRDP uses the all-systems multicast address
> (224.0.0.1) which is
> sort of a broadcast in a multicast group but I think it still
> uses multicast
> for the communication.
> Let me know.
>
> Edward
>
> -----Original Message-----
> From: Hire, Ejay [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, June 13, 2001 6:29 PM
> To: [EMAIL PROTECTED]
> Subject: RE: IRDP, why isn't it used more often [7:8425]
>
>
> Broadcast intensive and not natively implemented in the most
> common o/s
> would be my guess.
>
> -----Original Message-----
> From: Kane, Christopher A. [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, June 13, 2001 6:01 PM
> To: [EMAIL PROTECTED]
> Subject: IRDP, why isn't it used more often [7:8425]
>
>
> I've read several times that IRDP allows hosts to discover "gateway"
> routers. But every time I read that it's followed by the
> statement that it's
> seldom used. Does anybody know why? It seems like it would
> come in handy for
> failover purposes.
>
> Chris
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