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AS/400 Ethernet Adapter Redundancy

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Glyn Cheesman

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Aug 21, 2002, 10:39:57 AM8/21/02
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Hi,

I have a S20 AS/400 which is critical to our business. At the moment it has
two 10/100 Ethernet Interfaces installed with one active. I'm looking at
getting the second interface active to provide some level of redundancy.
Ideally I would connect each Ethernet interface to a different network
switch but on the same subnet using the same IP address. This would provide
me with some redundancy if I should experience a network switch failure. Is
it possible to have a virtual IP address that floats between the two
Ethernet interfaces ? Or is there something similar the AS/400 can do?

Any suggestions would be grateful received.

Thanks Glyn


René H. Hartman

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Aug 21, 2002, 1:42:02 PM8/21/02
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AFAIK the answer to that is a simple NO. While you can have multiple IP
addresses for one MAC-address, you can not have multiple MAC-addresses
with one IP-address. I would also expect your network to react very
unfriendly to assigning identical MAC-addresses to two ethernet cards.
--
Vriendelijke groeten / Kind regards
René H. Hartman
R.H. Hartman Automatiserings Consultancy
www.hac-maarssen.nl


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russandsandy

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Aug 22, 2002, 12:49:26 AM8/22/02
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I believe I saw that this support may have been added in V5R2, haven't had a
chance to check it out yet. I'm pretty sure your S20 tops out at V5R1.

In all other previous releases, an external "Virtual-IP" front-end box is
needed to do this.

RT

"Glyn Cheesman" <glyn_c...@uk.xyratex.com> wrote in message
news:102994080...@iapetus.uk.clara.net...

Stig Norre

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Aug 22, 2002, 1:42:05 AM8/22/02
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Hi there.

On Wed, 21 Aug 2002 15:39:57 +0100, "Glyn Cheesman"
<glyn_c...@uk.xyratex.com> wrote:

>Is it possible to have a virtual IP address that floats between the two
>Ethernet interfaces ? Or is there something similar the AS/400 can do?

The support for Virtual IP-adresses was added in V4R3. You can find more
information about Virtual IP here:

V5R1 Information Center:
http://publib.boulder.ibm.com/pubs/html/as400/v5r1/ic2924/info/rzai2/rzai2custom.htm

RedBook "V4 TCP/IP for AS/400: More Cool Things Than Ever" (SG24-5190-00):
http://publib-b.boulder.ibm.com/Redbooks.nsf/9445fa5b416f6e32852569ae006bb65f/baba0a045143082086256810007527b0?OpenDocument

RedBook "iSeries IP Networks: Dynamic!" (SG24-67-18-00, quite new)
http://publib-b.boulder.ibm.com/Redbooks.nsf/9445fa5b416f6e32852569ae006bb65f/fa563fa7759f973c85256baa004b8224?OpenDocument


Best regards

Stig Norre

System Consultant
IBM Certified Specialist

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