Re: HSRP and consecutive addressing
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 (.xxx01, .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 (.xxx1) 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. Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: HSRP and consecutive addressing
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 (.xxx01, .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 (.xxx1) 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. Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: HSRP and consecutive addressing
AFAIK, the addresses can be anything from the same network. I traditionally use .1 as the virtual address, and .2 and .3 as the addresses of the devices running HSRP. Since you configure each device to run HSRP and tell both the standby IP address I don't see why the addresses you have available will not work. If the HSRP functionality is being added to an existing production network, you might consider using the current client default gateway as the virtual address. That way you don't need to visit all the clients to see which one's are hard coded versus DHCP. Jeff Odell CCNA CCDA -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. Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
