No, the addresses in use for HSRP do not have to be from a consecutive
range...
Remember, the end node is using ARP to find the MAC address of it's default
gateway, so as long as it's on the the same subnet, you're cool...
-Brant
"Mooney Drew-DMOONEY1" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Rue Barb,
>
> This is excerpted from one of our local design docs - taken out of
context,
> I don't believe it gives away anything terribly proprietary, and may be of
> some assistance in explaining the reasons behind the 3-block addressing
> convention - if you consider the bitwise addressing across many subnets,
it
> becomes very clear:
>
> "It was decided to use the first and second addresses of a subnet
> (.xxx000001, .xxx00010) for the RSM interfaces and the third (.xxx00011)
for
> the HSRP virtual address. For example, in VLAN 10 RSM 1 will be
10.22.240.1,
> RSM 2 will be 10.22.240.2 and the HSRP virtual address will be
10.22.240.3.
> This approach can simplify the addressing of the CommHub by using the
> (.xxx00001) address to represent the first RSM and (.xxx00010) to
represent
> the second one. The ethernet port addresses were determined with reference
> to the particular equipment connected to the VLAN."
>
> Hope this helps,
>
> Drew M. Mooney
> Invisix -- Motorola and Cisco Together
> 1334-394 The Alameda // San Jose, CA 95126
> 408-525-0873 [office] 408-287-3188 [home]
> 817-937-7880 [mobile] 888-809-9678 [SkyTel Pager]
> +44-(0)7715-055-944 UK Mobile
>
>
> -----Original Message-----
> From: Rue Barb the Tangled [mailto:[EMAIL PROTECTED]]
> Sent: Monday, July 24, 2000 3:16 PM
> To: [EMAIL PROTECTED]
> Subject: HSRP and consecutive addressing
>
>
> Well, this didn't post the first time, so I'll try again.
>
> When implementing HSRP with IP addressing, do the addresses need to be
> consecutive? Every sample I've seen lists 10.0.0.1 and 10.0.0.2 (or some
> variant) as the router addy's and 10.0.0.3 as the virtual address.
>
> In the real world, however, where HSRP is an afterthought and not planned,
> the people who put in static addresses and default gateways don't leave 3
ip
>
> addresses in a block to use. (Obviously they'll have to be the same
subnet,
>
> of course) - and they want the old ip addresses on a router to be new the
> virtual addy's now -
>
> So could I use 10.0.0.5 and 10.0.0.18 with a virtual addy of 10.0.0.144?
> (assuming 255.255.255.0 subnetmask, of course)
>
> No useful info on CCO, so any advice would be appreciated.
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