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PowerConnect48
41 Posts
1
520711
October 6th, 2014 10:00
MTU Sizes Jumbo Frames
I have a few questions on how the PowerConnect 6248 handles MTU sizes:
1. It appears if I have a host using jumbo frames at 9000 MTU then I have to use a MTU of 9216 to match?
2. I can apply a MTU size under a VLAN using the "ip mtu" command but I can't set it to 9216 since I get an error back saying "Value is out of range. The valid range is 68 to 9198." I understand why since 9216 isn't even a valid standard for jumbo frames. So is the MTU size on the port vs VLAN suppose to be different to support a MTU of 9000?
3.Do I have to apply a MTU size to a VLAN? My intent is not all VLANs on the physical port need jumbo frames.
PowerConnect48
41 Posts
22676
0
Posted October 6th, 2014 13:00
Daniel -
Would you mind reviewing my initial questions as I don't believe you fully understand them. See below on my firmware.
console#show ver
Image Descriptions
image1 : default image
image2 :
Images currently available on Flash
--------------------------------------------------------------------
unit image1 image2 current-active next-active
--------------------------------------------------------------------
1 3.3.11.2 3.3.4.1 image1 image1
PowerConnect48
41 Posts
22676
0
Posted October 6th, 2014 13:00
Daniel
You are referring to a physical port. Please see below, I am referring to a VLAN interface.
2. I can apply a MTU size under a VLAN using the "ip mtu" command but I can't set it to 9216 since I get an error back saying "Value is out of range. The valid range is 68 to 9198." I understand why since 9216 isn't even a valid standard for jumbo frames. So is the MTU size on the port vs VLAN suppose to be different to support a MTU of 9000?
3.Do I have to apply a MTU size to a VLAN? My intent is not all VLANs on the physical port need jumbo frames.
PowerConnect48
41 Posts
22676
0
Posted October 7th, 2014 07:00
OK so back to question
3.Do I have to apply a MTU size to a VLAN? My intent is not all VLANs on the physical port need jumbo frames.
PowerConnect48
41 Posts
3365
0
Posted October 7th, 2014 10:00
"i would set the ip mtu to 9198."
To be clear, on a host with a MTU of 9000 you're saying on the VLAN interface that would equal 9198 on your switch? That is odd but let me know if that is what you're saying.
simomemtro
1 Message
3365
0
Posted September 14th, 2017 06:00
Hi
I have a question please. i dont have acces to my actual fabric switch 2748 and i am waiting for a powerconenct 7048 switch that i need to set it as a fabric switch. on my hosts and SAN eqaullogic Ps6100 i have the MTU set at 9000. what Mtu should i give to my Dell 7048 ? 9000 or 9219 ? and whay ?
many thanks
Hello,
here you find the best-practice configuration for a lot of switches and different Dell-SANs.
Among them is the PC7048: http://en.community.dell.com/techcenter/extras/m/white_papers/20438529/download.aspx
regards
Henning
PowerConnect48
41 Posts
22550
0
Posted October 6th, 2014 12:00
I don't understand your response of:
1. "Getting the firmware up to date should enable the larger MTU setting."
9216 MTU is not even in the Ethernet Jumbo Frame standard, so why would it support larger?
2. I'm on the latest firmware A36, so no changes have been made to this release.