Re: Setting IP redunduncay in AS/400

Be vewy vewy kareful, we're hunting wabbits. no wait, that's redundancy we're hunting! Be careful anyway!

Yes you can use aggregate lines as one end of the bridge. Supported and legal. Then you use a line description to the internal VLAN as the other end of the bridge. So far so good. Let's suppose the internal VLAN is VLAN 1.

Now let's do this again, two more aggregated lines another bridge but this time to VLAN 2 on the inside.

Each partition then gets one virtual connection to VLAN 1 and one to VLAN 2 then set up the IPs as I described before. This gives, um, redundant redundancy? (From the department of redundancy department?)

Why be careful? Because if you create two bridges like this but connect both bridges to VLAN 1 then you have just created a loop and your network will not appreciate this. Most likely bad things will happen unless your switches are pretty smart, recognize this, and set one of the bridges to blocking mode. If it does that to both of them then the rest of the network runs but the entire Power System is now off line! Either way, not good.

Yes of course I tested this and it foo-barred the network as it creates a packet storm. (With Cisco switches at least.) I did not take the time to mess with storm control I just varied off the offending bridge lines.

- Larry "DrFranken" Bolhuis

www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com

On 10/1/2013 11:10 AM, Mitchell, Dana wrote:

Exactly what I am thinking about doing too. Is there any reason this cannot be combined with bridging to serve redundant IP connections to 2 or more LPARs using only two network cards?

Dana

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx
Sent: Tuesday, October 01, 2013 8:37 AM
To: Midrange Systems Technical Discussion
Subject: Re: Setting IP redunduncay in AS/400

This was all done differently on old AS/400's. But on newer IBM i installations there is something called "Aggregate Ethernet Lines". This came out with 7.1.
http://www.ibm.com/developerworks/ibmi/library/i-ethernetlines/


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1 Group Dekko Dept 1600 Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: Vikhyath Kamath <vikyat_kaamath@xxxxxxxxx>
To: "midrange-l@xxxxxxxxxxxx" <midrange-l@xxxxxxxxxxxx>,
Date: 10/01/2013 09:23 AM
Subject: Setting IP redunduncay in AS/400
Sent by: midrange-l-bounces@xxxxxxxxxxxx



Hi,

We have 5 LPARs on each of our servers. Recently we faced an issue where
the LAN adaptor of iseries system failed and we had a five hour outage.
I was considering if we could have IP redundency - so that each LPAR would
have 2 IPs pointing one IP which the user access. So if one IP fails,
there is a fail-over to the other IP. Could some please guide how this is
done in AS/400 system?

Thanks and Regards,
Vik.