12-12-2014 11:48 AM
I'm trying to find out if our MTU size is causing slow performance for a RAP over a large 4G connection back to our site. I determined the path has a maximum MTU of 1472. I think the MTU for the RAP is 1200. Is there somewhere else to look to see if it is overriding the 1200? I'm going out to take a trace when time permits but I'm hoping to do some leg work before I get onsite to continue troubleshooting.
12-12-2014 12:47 PM - edited 12-13-2014 01:10 AM
Does that RAP have a second ethernet port? You should try "bcmc-optimization" on the VLAN on the controller for whatever VLAN is connected to that second enet port to start. That would stop broadcasts from propagating from the headend to the enet interface; that just steals your bandwidth with useless broadcast traffic. http://community.arubanetworks.com/t5/Controller-Based-WLANs/How-to-stop-unknown-unicast-from-LAN-to-be-flooded-by-the/ta-p/179934
To fully answer your question, you need to type "show datapath tunnel table" and find the RAP that is connected to see the MTU.
Aruba Customer Engineering
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