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NLB cLuster on 9702E

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strelok
Member
Posts: 59
Joined: 27 Nov 2013 03:04

NLB cLuster on 9702E

Post by strelok » 12 Aug 2016 06:10

Hello,

We are trying to setup NLB cluster, and we faced with some issues.
So, I attached network scheme.

We have OmniSwithces 9702E
AOS 6.4.6.340.R01
boards OS9-GNI-C24E

The main problem is that client cannot reach NLB cluster from another network via another router.
Please, look at network scheme for detatils.


If all nodes of nlb cluster is available, client can reach nlb cluster via router 1 without problem.
In case of one of node nlb cluster down (Server1) client cann't reach nlb cluster (new active node Server2) via router 2.
Moreover we can see that client send ARP requests to router 1 and no any arp requests from router 1 towards router 2.

Also we don't see arp requests in vlan 100 from Router 1 to Router 2, when all nodes of NLB cluster is UP.
Last edited by strelok on 12 Aug 2016 06:18, edited 2 times in total.

strelok
Member
Posts: 59
Joined: 27 Nov 2013 03:04

Re: NLB cLuster on 9702E

Post by strelok » 12 Aug 2016 06:16

Here is attached network scheme.
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alexC
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Posts: 5
Joined: 07 Oct 2011 09:59

Re: NLB cLuster on 9702E

Post by alexC » 16 Aug 2016 13:45

Hi strelok,

It happens because Omniswitch, through which NLB cluster is working, should act only as L2 device. Otherwise it will use ARP table to make a decision, which have an association only with a single port. The key of NLB is that we have cluster MAC address (VMAC) in answers from NLB nodes, which will never learn in Omniswitch MAC address table. Using this trick NLB cluster causes Omniswitch to make broadcast delivery to all nodes. If Omniswitch will work as L3 device and use ARP table, it will send traffic only to a single node.

strelok
Member
Posts: 59
Joined: 27 Nov 2013 03:04

Re: NLB cLuster on 9702E

Post by strelok » 17 Aug 2016 06:04

Hello, alexC.

Thank you very much for explanation !

Are there any workarounds in our case ?

strelok
Member
Posts: 59
Joined: 27 Nov 2013 03:04

Re: NLB cLuster on 9702E

Post by strelok » 17 Aug 2016 06:05

Hello, alexC.

Thank you very much for explanation !

Are there any workarounds in our case ?

alexC
Member
Posts: 5
Joined: 07 Oct 2011 09:59

Re: NLB cLuster on 9702E

Post by alexC » 18 Aug 2016 11:00

Check this topic

viewtopic.php?f=191&t=15911&start=10

I hope this helps.

narasimha928
Member
Posts: 2
Joined: 16 Mar 2016 00:51

Re: NLB cLuster on 9702E

Post by narasimha928 » 15 Sep 2016 19:41

Hello

can you share the cluster configuration on router 1 and router 2 on erp ring.

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