Solved

MTU setting on Cisco switch

Posted on 2014-09-08
6
934 Views
Last Modified: 2014-09-11
I have a Cisco 3560G switch connecting to a Cisco 3750x switch via fiber 1Gbps.
On the 3560g I can configure jumbo fames to 9000 bytes and on the 3750x I can configure jumbo frames to 9198 bytes.
Will this create a problem when on one switch it has 9000 bytes jumbo frames and the other one 9198 bytes.
Or must I configure both switches to 9000 bytes.
Please advice on this
0
Comment
Question by:ciscosupp
6 Comments
 
LVL 9

Accepted Solution

by:
Ashok Dewan earned 167 total points
ID: 40310847
Yes, MTU value should be same for neighbor devices to communicate properly.

you can find the correct MTU for your configuration you must run a simple DOS Ping test. You will simply send out ping requests and progressively lower your packet size until the packet no longer needs to be fragmented. Please reference the following command.

ping www.tp-link.com -f -l xxxx

f for don't fragment the packet
l for setting buffer size
0
 
LVL 9

Expert Comment

by:nattygreg
ID: 40311256
size must be the same and be supported on each end
0
 

Author Comment

by:ciscosupp
ID: 40311300
so can my uplinks be 9000 bytes and port for end user be  still be 1500 bytes without getting any problems
0
Control application downtime with dependency maps

Visualize the interdependencies between application components better with Applications Manager's automated application discovery and dependency mapping feature. Resolve performance issues faster by quickly isolating problematic components.

 
LVL 45

Assisted Solution

by:Craig Beck
Craig Beck earned 333 total points
ID: 40315152
Yes, the uplinks can have a larger MTU than the user ports, but it shouldn't be smaller than user ports.
0
 

Author Comment

by:ciscosupp
ID: 40315180
thanks
last question so basically I can turn on jumbo frames (to max value) on all my switch in the network.
All my switches are  Cisco some support only 9000 and some 9189 bytes will this not be a problem.
0
 
LVL 45

Assisted Solution

by:Craig Beck
Craig Beck earned 333 total points
ID: 40316338
If you link two switches with different MTU values, set both link interfaces to the lowest value, so if one switch only goes to 9000 set the other switch's uplink to 9000 too.

If you mismatch the MTU you'll get fragmentation problems and dropped traffic.
0

Featured Post

Control application downtime with dependency maps

Visualize the interdependencies between application components better with Applications Manager's automated application discovery and dependency mapping feature. Resolve performance issues faster by quickly isolating problematic components.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Low Cost Managed Switch 19 96
Connecting a Cisco switch to a HP Procurve 3 45
L2 to EIGRP slow migration? 27 95
Network Infrastructure for Branch Office 16 87
I see many questions here on Experts Exchange regarding switch port configurations and trunks. This article is meant for beginners in the subject to help to get basic knowledge about Virtual Local Area Network (VLAN (http://en.wikipedia.org/wiki/Vir…
This tutorial will go through the steps required to write a script that will back up the configuration settings of a HP-ProCurve switch. You will need to get the following things to follow this tutorial: Telnet Scripting Tool e.g. TST10.exe …
This video demonstrates how to create an example email signature rule for a department in a company using CodeTwo Exchange Rules. The signature will be inserted beneath users' latest emails in conversations and will be displayed in users' Sent Items…
A company’s greatest vulnerability is their email. CEO fraud, ransomware and spear phishing attacks are the no1 threat to a company’s security. Cybercrime is responsible for the largest loss of money to companies today with losses projected to r…

929 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

10 Experts available now in Live!

Get 1:1 Help Now