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Frequent Contributor II
Posts: 110
Registered: ‎12-07-2007

Actual MTU

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.

Guru Elite
Posts: 20,821
Registered: ‎03-29-2007

Re: Actual MTU

[ Edited ]

pdavis,

 

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.

 

 



Colin Joseph
Aruba Customer Engineering

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