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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