From: WorkerBee (ciscobee@gmail.com)
Date: Wed Oct 11 2006 - 12:40:43 ART
Alex,
When you mention secondary address, do you mean an additional ip
address in the same subnet as the physical interface as R1 and R2?
Extract from 12.4T HSRP notes:
>> For n routers running HSRP, n + 1 IP and MAC addresses are assigned.
You can see below that Cisco HSRP virtual ip address cannot use the
physical HSRP router ip address, hence VRRP is more approriate since
VRRP does not require an additional ip address for it's virtual ip.
R6(config-if)#standby ip 150.1.56.6
% address cannot equal interface IP address
R6(config-if)#
Is that what you looking for?
On 10/10/06, Alex De Gruiter (AU) <Alex.deGruiter@didata.com.au> wrote:
> Ok next question:
>
> If we are asked to provide redundancy without applying secondary IP
> addressing, and a router (lets say R1) should be preferred over another
> router (lets say R2), the options as I see them are:
>
> 1. Use HSRP, removing the IP address from R1 and re-using it for HSRP
> 2. Use VRRP, using the IP address on R1
>
> My question is one of understanding - if we can not apply secondary IP
> addressing and clients on a LAN should prefer a particular gateway over
> another, then I believe the preferred option would be to use VRRP (?).
>
> -----Original Message-----
> From: Alexei Monastyrnyi [mailto:alexeim@orcsoftware.com]
> Sent: Tuesday, 10 October 2006 3:04 AM
> To: Alex De Gruiter (AU)
> Cc: ccielab@groupstudy.com
> Subject: Re: First-hop redundancy protocols
>
> HSRP v3 isn't that bad to discount it :-)
>
> IRDP support you can google,
> ====
> IRDP (router discovery) support has been added to Windows NT 4.0. IRDP
> support has also added to Windows 95 and 98 (see the "More Information"
> section of this article).
> ==== MS knowledge base Sept 2005
>
> Most Unix platforms support IRDP
> http://www.cctec.com/maillists/nanog/historical/9811/msg00355.html
>
> HTH
> A.
>
> on 10/9/2006 1:44 AM Alex De Gruiter (AU) wrote:
> > Hello,
> >
> > I have 2 questions relating to first-hop redundancy protocols.
> >
> > 1. Lets assume that you have 2 x routers - R1 and R2. These routers
> > are both connected to the same Ethernet LAN segment; devices on this
> > network should use R1 as the default gateway, and R2 should take over
> > in the event of failure, however hosts on the segment should only have
>
> > 1 gateway configured. If there is nothing in the question to indicate
> > secondary addressing, is using VRRP the most appropriate solution?
> >
> > 2. IRDP: what platforms can support this protocol (Unix, Windows?)?
> > Would the following be a minimum configuration (assume, again, that R1
>
> > is preferred):
> >
> > R1
> >
> > interface ethernet0
> > ip irdp
> > ip irdp preference 200
> >
> > R2
> >
> > interface ethernet0
> > ip irdp
> >
> > Would I need anything else? I'd be interested in testing IRDP (I know,
>
> > it's a legacy protocol, but I'm a glutton for punishment).
> >
> > Alex
> >
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