Wireless Access

Reply
MVP
Posts: 4,269
Registered: ‎07-20-2011

How LAG works with AP-225

 

I been looking for a document that explains the logic of how LAG will work for the AP225/224 and how it will accomplish the 1.3 Gbps speeds 

 

How is it going to build the GRE tunnels ? and how can you configure the switch ( just a normal port-channel config) ?

 

 

 

 

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Aruba
Posts: 1,368
Registered: ‎12-12-2011

Re: How LAG works with AP-225

NOTE - this is for a centralized controller based deployment.

 

Basically, the gist is that each radio (2.4 and 5) on the AP will correspond to either port 1 or port 2 in the LAG.  

 

The switch must be configured to support a LAG based on Source IP address (from the controller).  There will be two GRE tunnels built and based on the previous statement, traffic will always enter the appropriate port to the AP.  The issue isn't the upstream traffic...it's the downstream.  

 

If you consider the following statements:

 

1. Most Ethernet switches support Etherchannel load-balancing based on some combinations of the 5-tuple <src mac, dest mac, src IP, dest IP, protocol>
2. In a centralized WLAN architecture, all traffic tunneled between the AP and the control have the same outer IP header and 5-tuple

 

So, from a LAG perspective...all traffic looks the same and is therefore hashed out in the same manner.  

 

Aruba intends to initally solve this by configuring two consecutive IP addresses to the controller so that alternate IP addresses can be used for different GRE tunnels between the AP and the controller.  This ensures traffic from the controller to the AP will have different source IP addresses in the outer IP header based on the destination radio interface.  

 

At the end of the day, the AP aggregate throughput is < 1Gbps.

Seth R. Fiermonti
Consulting Systems Engineer - ACCX, ACDX, ACMX
Email: seth@hpe.com
-----
If you found my post helpful, please give kudos
MVP
Posts: 4,269
Registered: ‎07-20-2011

Re: How LAG works with AP-225

 

Very interesting .

 

Thanks for the explanation 

 

Seth where can I find this information ?

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Aruba
Posts: 1,368
Registered: ‎12-12-2011

Re: How LAG works with AP-225

When we release support for the LAG on the AP225 then it should be included in the release notes.  

Seth R. Fiermonti
Consulting Systems Engineer - ACCX, ACDX, ACMX
Email: seth@hpe.com
-----
If you found my post helpful, please give kudos
MVP
Posts: 4,269
Registered: ‎07-20-2011

Re: How LAG works with AP-225

 

Do you know in what version AOS this will be supported ?

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Aruba
Posts: 1,368
Registered: ‎12-12-2011

Re: How LAG works with AP-225

6.3.1.0

Seth R. Fiermonti
Consulting Systems Engineer - ACCX, ACDX, ACMX
Email: seth@hpe.com
-----
If you found my post helpful, please give kudos
MVP
Posts: 4,269
Registered: ‎07-20-2011

Re: How LAG works with AP-225

 

It would be nice if there was a technote about this setup.

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Aruba
Posts: 1,368
Registered: ‎12-12-2011

Re: How LAG works with AP-225

I will make a note of it and encourage the same

Seth R. Fiermonti
Consulting Systems Engineer - ACCX, ACDX, ACMX
Email: seth@hpe.com
-----
If you found my post helpful, please give kudos
MVP
Posts: 4,269
Registered: ‎07-20-2011

Re: How LAG works with AP-225

Thanks Seth

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Search Airheads
Showing results for 
Search instead for 
Did you mean: