Solved

MTU on leaf switch

Posted on 2016-07-29
1
75 Views
Last Modified: 2016-08-01
I have a Meraki 220 switch connected to a Cisco intergrated Etherswitch (essentially a 3750 built into a Cisco 2921 ISR.) The Etherswitch is the root bridge. I noticed that the default MTU on the Meraki is set to 9578 where as the MTU on all ports on the Etherswitch is 1500. Should I just lower the MTU on the Meraki? Or does it likely not matter? The devices connecting to the Meraki are generally Cisco phones that then may have a laptop attached to them. Thank you.
0
Comment
Question by:amigan_99
1 Comment
 
LVL 68

Accepted Solution

by:
Qlemo earned 500 total points
ID: 41735668
9k MTU is for Jumbo Frames, which are an extension of the classic Ethernet packets of 1526 (raw, 1500 payload). Because of implementation differences and all the friction that creates it is not recommended to use  Jumbo Frames unless in very specific cases (point-to-point traffic like for SAN).
To be used, Jumbo Frames need to be set up on all communication partners. I don't expect VoIP   to be a good case for Jumbo Frames, but I wouldn't change the max. MTU on Meraki - or at least keep an eye on it after changing. It should not have an effect to reduce the MTU, but ...
0

Featured Post

Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The worst thing when starting a new job is when the previous Network Administrator left behind no documentation. How do you get into the devices? If you've been in this situation or just accidently mistyped your password, this article will hopefully…
When I upgraded my ASA 8.2 to 8.3, I realized that my nonat statement was failing!   The log showed the following error:     %ASA-5-305013: Asymmetric NAT rules matched for forward and reverse flows It was caused by the config upgrade, because t…
Both in life and business – not all partnerships are created equal. As the demand for cloud services increases, so do the number of self-proclaimed cloud partners. Asking the right questions up front in the partnership, will enable both parties …
Both in life and business – not all partnerships are created equal. Spend 30 short minutes with us to learn:   • Key questions to ask when considering a partnership to accelerate your business into the cloud • Pitfalls and mistakes other partners…

863 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now