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Community Member

Layer 2 extension for DCI and Application Load Balancing

Given a layer 2 extension has been provided between two dispersed data centers, placing two ACE load balancers (one at each DC) configured for high availability -I understand all you need is to share a common Vlan which will be extended across the two DC's- is this a recommended setup to provide for active/active data centers? I appreciate any comments.

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Cisco Employee

Re: Layer 2 extension for DCI and Application Load Balancing

Ah, ok. I was involved in some similar setups for some big customers and it worked just fine. As long as the ACEs see each other over a broadcast medium (needed because heartbeats are broadcasted) in a dedicated VLAN (needed to prevent anything interfering with the communication) the ACEs don't care if the other one is in the next rack or 100km away.

6 REPLIES
Cisco Employee

Re: Layer 2 extension for DCI and Application Load Balancing

Yes, that is correct. You need a direct L2 connectivity over a dedicated VLAN for ACE FT communication. Of course, client and server facing VLAN need to be at both DCs as well.

Community Member

Re: Layer 2 extension for DCI and Application Load Balancing

Thanks Ivan, still wondering if this a common practice or a cisco's "validated design" , have you seen this configuration with active/active DC's?

Cisco Employee

Re: Layer 2 extension for DCI and Application Load Balancing

I am not sure which part is confusing you. Is it becuse the DCs are geographically spread apart? Or because it is Active/Active? Or is it the fact you need a dedicated VLAN for FT data? How else would you do it? So which part of the puzzle doesn't seem right for you?

Community Member

Re: Layer 2 extension for DCI and Application Load Balancing

Thanks again for your opinion, I mean the fact that the two DC's are geographically dispersed, I haven't come across any "real world" enviroments that leverage their extended layer 2 capabilities to run active-active ACE load balanced server VLANS.

Cisco Employee

Re: Layer 2 extension for DCI and Application Load Balancing

Ah, ok. I was involved in some similar setups for some big customers and it worked just fine. As long as the ACEs see each other over a broadcast medium (needed because heartbeats are broadcasted) in a dedicated VLAN (needed to prevent anything interfering with the communication) the ACEs don't care if the other one is in the next rack or 100km away.

Community Member

Re: Layer 2 extension for DCI and Application Load Balancing

Thanks! Very helpful.

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