From: Shaun Nicholson (Shaun.Nicholson@xxxxxx)
Date: Fri Jan 19 2001 - 17:57:52 GMT-3
Some UNIX boxes still work with IRDP it allows them to find their own default g
ateway and it can use a multicast address to inform of status.
Other wise yes its very similar to HSRP however HSRP is like EIGRP and specific
to Cisco unlike IRDP and OSPF which are open standard.
Shaun Nicholson CCIE 6705
Lead Network Engineer
Kaiser Permanente
Silver Spring Data Center
301 680 1462
abaskerville@ibeam.com on 01/19/2001 03:39:00 PM
To: mschlenger@n2nsolutions.com@Internet, ccielab@groupstudy.com@Internet
cc: (bcc: Shaun Nicholson/MD/KAIPERM)
Subject: RE: IRDP
My understanding is that IRDP and HSRP have very similar functionality.
However, some hosts may not be capable of using IRDP, in which case you
would use HSRP. Allyn
-----Original Message-----
From: Mike Schlenger [mailto:mschlenger@n2nsolutions.com]
Sent: Friday, January 19, 2001 1:32 PM
To: ccielab
Subject: IRDP
ICMP Router Discovery Protocol. This looks to be a viable topic. Does anyone
have any information on this? CCO states:
"The router software provides a third method, called router discovery, by
which the router can dynamically learn about routes to other networks using
the Gateway Discovery Protocol (GDP) or the ICMP Router Discovery Protocol
(IRDP) for detecting routers. The software is also capable of wire-tapping
Routing Information Protocol (RIP) and Interior Gateway Routing Protocol
(IGRP) routing updates and inferring the location of routers from those
updates. The server/client implementation of router discovery does not
actually examine or store the full routing tables sent by routers, it merely
keeps track of which systems are sending such data."
Then it goes on saying:
"You can configure these protocols in any combination. When possible, we
recommend that you use GDP or IRDP because they allow each router to specify
both a priority and the time after which a router should be assumed down if
no further packets are received. Routers discovered using IGRP are assigned
an arbitrarypriority of 60. Routers discovered through RIP are assigned a
priority of 50. For IGRP and RIP, the software attempts to measure the time
between updates and
will assume that the router is down if no updates are received for 2.5 times
that interval."
It sounds to me like it could be configured in place of HSRP....Am I missing
something? Is this the right application?
Regards,
Mike Schlenger
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