Newb Question on Jumbo Frames

We have a Metro connection setup for replication and we are getting a lot of re-transmits with our storage and they (Dell) made a few suggestions. Currently our SYSTEM MTU is set to 9000 but they suggest 9198. First, does that make sense and second is there any interruption on our production side if we change the MTU size?? Also they want us to change the command from system mtu routing 9000 to system mtu jumbo 9198.
Just need a little clarification if possible. Also we are running a catalyst 3750. Any comments or suggestions are welcome. Thanks in advance!
Perry

Yes it supports
Standalone Catalyst 3750-X, 3750-E, 3560-X or 3560-E switch or Catalyst 3750-X-only or Catalyst 3750-E-only stack
You can enter the command on on a Catalyst 3750-X, Catalyst 3750-E, Catalyst 3560-X, or Catalyst 3560-E switch, but system MTU value does not take effect. 1
Use thesystem mtu jumbo bytescommand.
The range is from 1500 to 9198 bytes.
Use the system mtu routing bytescommand.
The range is from 1500 to the system jumbo MTU value (in bytes).2
Mixed hardware stack
Use the system mtu bytes command, which takes effect only on Catalyst 3750 members.1
The range is from 1500 to 1998 bytes.
Use thesystem mtu jumbo bytescommand.
The range is from 1500 to 9000 bytes.
Use the system mtu routing bytescommand.
The range is from 1500 to the system MTU value (in bytes).2
Catalyst 3750-only stack
Catalyst 3750 switch
Catalyst 3560 switch
Use the system mtu bytes command.
The range is from 1500 to 1998 bytes.
Use thesystem mtu jumbo bytescommand.
The range is from 1500 to 9000 bytes.
Use the system mtu routing bytescommand.
The range is from 1500 to the system MTU value (in bytes).
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_53_se/command/reference/3750xcr/cli3.html#wpmkr3079919
Usage Guidelines
The switch does not support the MTU on a per-interface basis.
The system mtu bytes global configuration command only affects the system MTU size on Fast Ethernet ports on Catalyst 3750 members in a mixed hardware switch stack. In this stack, you can use the system mtu bytes global configuration command on a Catalyst 3750-E or Catalyst 3750-X member to configure the system MTU size on a Catalyst 3750 member. If you enter the system mtu bytes global configuration command on a Catalyst 3750-E or a 3560-E switch, the command does not take effect.
The system mtu, system mtu jumbo, and system mtu routing global configuration commands do not take effect in these cases:
•When you enter the system mtu command on a Catalyst 3750-E or 3560-E switch
•In a mixed stack when you enter the system mtu jumbo command for the Fast Ethernet ports on a Catalyst 3750 member
•When you enter the system mtu routing command on a switch on which only Layer 2 ports are configured
Note This command is not supported on switches running the LAN base feature set.
HTH
Sandy

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For 1) the question is really "Do I need to enable Jumbo Frames if I don't want to use them (neither public nore private network)" - the answer is no.
For 2) each cluster needs to have its own seperate set of VLANs.
Greets
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Kimberly,
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I move a lot of large files (RAW photos, music and video) around my internal network, and I'm trying to squeeze out the fastest transfer speeds possible. My question has to do both with decisions about hardware and what settings to use once it's all hooked up.
This is what I have so far:
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-- jumbo frames have been enabled in the settings of the macs, the switch and the buffalo HD.
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-- also, whenever I'm doing a major move of data, I kick my family off the network, so there is no other traffic that should be interfering.
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I also have a dual band (2.4/5) wireless n router (not jumbo frame capable), but I'm assuming wired is going to trump wireless? (NOTE: in my tests, I have disabled wireless to force the connection through the ethernet).
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Thanks in advance!
juliana

I'm going to pick and choose to answer just a few of the items you have listed. Hopefully others will address other items.
• This setup was getting me speeds as high as 10-15MB/sec, and as low as 5-6MB/sec when I was transferring video files around 1-2 GB in size
I would think a single large file would get the best sustained transfer rates, as you have less create new file overhead on the destination device. It is disturbing that the large files transfer at a slower rate.
• Would a RAID0 config get me faster write speeds than RAID1? I have another NAS that can do other RAID configs, which is fastest as far as write times?
RAID0 (Striped) is generally faster, as the I/O is spread across 2 disks.
RAID1 is mirrored, so you can not free the buffer until the same data is on BOTH disks. The disks are NOT going to be in rotational sync, so at least one of the disks will have to wait longer for the write sectors to move under the write heads.
But RAID1 gives you redundency. RAID0 has not redundency. And you can NOT switch back and forth between the 2 without reformatting your disks, so if you choose RAID0, you do not get redundency unless you provide your own via a backup device for your NAS.
• what is the most efficient transfer protocol? ftp? smb? something else? And am I better off invoking the protocol from the terminal, or is the overhead of an app-based client negligible?
Test the different transfers using a large file (100's of MB or a GB sized file would be good as a test file).
I've had good file transfers with AFP file sharing, but not knowing anything about your NAS, I do not know if it supports AFP, and if it does, whether it is a good implementation.
If your NAS supports ssh, then I would try scp instead of ftp. scp is like using cp only it works over the network.
If your NAS support rsync, that would be even better, as it has the ability to just copy files that are either NOT on the destination or update files which have changed, but leave the matching files alone.
This would help in situations where you cannot copy everything all at once.
But no matter what you choose, you should measure your performance so you choose something that is good enough.
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Again just test what you have.
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If the bottleneck is the NAS, then adding more I/O that will force the disk heads to move away from the current file being written will just slow things down.
But try 2 connections and measure your performance. If it gets better, then maybe the NAS is not the bottleneck.
• What question am I not asking?
You should try using another system as a test destination device in the network setup to see if it gets better, worse, or the same throughput as the NAS. You need to see about changing things in your setup to isolate where the problem might be.
Also do not rule out bad ethernet cables, so switch them out as well. For example, there was a time I tried to use Gigabit ethernet, but could only get 100BaseT. I even purchased a new gigabit switch, thinking the 1st was just not up to the task. It turned out I had a cheap ethernet cable that only had 4 wires instead of 8 and was not capable of gigabit speeds. An ethernet cable that has a broken wire or connector could exhibit similar performance issues.
So change anything and everything in your setup, one item at a time and use the same test so you have a pear to pear comparision.

How to enable "Jumbo Frame" at RV320 LAN ports?

I'm sorry about my silly question, where is the option to turn on the "Jumbo Frame" or allow to adjust MTU at the RV320 LAN ports?
I can't found that in the Web management interface, will it just take the 9Kb MTU packet and no need to set?
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Hello,
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Macbook pro late 2008+jumbo frames

Hello
I've just got a buffalo duo nas server, and im not that happy about the speed..
Now, i know it supports jumbo frames, so my question is, does the Macbook Pro late 2008 support jumbo?
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If the macbook supports JF:
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there is no need to change the MTU. are you using wired or wireless connection to connect to yours nas server?

[BUG] Jumbo frames issues after suspend/resume

I have a 2.66Ghz MacBookPro5,1 which I recently upgraded to Snow Leopard. It's connected to a gigabit LAN and makes use of jumbo frames (MTU 9000).
Everything was working flawlessly under Leopard, but since the upgrade to 10.6, I've noticed some very strange networking behavior. Essentially, networking goes AWOL as soon as it tries to transfer big data chunks *after a suspend/resume*. Remote sessions (ssh), file tranfers (ftp/afp) are affected.
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This problem only happens after suspend/resume. Upon cold boot, everything works just fine, so I'm suspecting a driver issue.
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HTH
Message was edited by: thibaut

If you have found a verified and reproducible bug then report it here: Feedback. The Discussions is not a bug reporting venue. Apple engineers do not read the Discussions.
If you want help resolving a problem that is the purpose of the Discussions, but you need to post a question.

Airport Extreme with Gigabit Ethernet - Does it have jumbo frame support?

Please, can I get definite answer to this question? I do not need speculations as I read some reviews already. Can we have Apple finally put complete specification of the product rather than "popular one" with attachement of protocol numbers?
I just need simple answer possibly from Apple engineering team to the following questions:
1. Does current Airport Extreme have support for jumbo frames (everything above 1500bytes per frame)? (if one does not know what that is them perhaps understanding acronym "MTU" can help a bit)
2. If there is support then what is the maximum supported size of jumbo frame? (Some products do not go above 6k and I read some statistics that traffic somwhere is usually 66% at about 4k jumbo frames and above that there is not much...)
3. If there is no support then does Apple plan on update for this (firmware or hardware) in the future?
Please, do not tell me that someoene ran something with jumbo frame and it worked as I tried yesterday LaCie Ethernet drive with supposedly setup (I set it myself) of jumbo frame 4k and on soft reboot of the drive it worked when connected to Airp[ort Extreme, but after hard reboot the disk is not visible anymore. I will recover the disk, but I need to understand if I have chance of using jumbo frames that tremendously improve performance with large files (e.g. try movies stored for AppleTV on network drive) when using Airport Extreme with its gigabit Ethernet... or that is just Gigabit Ethernet for product marketing purposes only.
I just need reliable answer by product specification that should be on paper at Apple, but it is not so I hope that one of guys here has access to some engineering team.
Thank you,
Maciek Samsel

The spec. on the chip used by Apple support your conclusion.
BCM5395 Features
Complies with IEEE802.3, IEEE802.3u, IEEE802.3ab standards
5 10/100/1000Mbps Auto-Sense RJ45 ports supporting Auto-MDI/MDIX
All ports Support Full/Half Duplex transfer mode for 10/100Mbps and Full Duplex transfer mode for 1000Mbps
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IEEE 802.1Q-based VLAN with 4K entries
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Port mirroring
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512 rules
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Jumbo frame support with BGP MSS size

Hi All,
I am working at small SP. we are going to enable Jumbo Frame support from end to end. Our core segment have MPLS cloud and packet size could be able support up over 9000 already. Since our Core segment router are running pure BGP with our edge/access segment router , when I enable jumbo frame support on their interface level, I still can see BGP MSS size is 1260 right now. so my question, do I need increase BGP MSS size between our core router and edge router for transiting our SP cloud traffic packet ?
many thanks!
Eric

hi Harold,
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Jumbo Frame - Enabling on a VLAN of CAT 6500 running IOS

Jumbo frames needs to be enabled on one of the vlan interface on Cisco 6500 IOS Switch.
=================================================================
•1) Once enabled the mtu 9216 on the required vlan interface do we need to reload the switch to take effect (I believe that in some low end swicthes it needs a reload)
•2) If we enable only one Vlan interface, how about the other vlan interfaces(about 200 are on this switch)? Do we need to specify mtu1500 on other vlan interfaces?
I have read information at the following two links, but I still wish to reconfirm by asking the questions in this forum. Someone who has already implemented this may have gained more experience while implementing it on CAT 6500 IOS Switch.
https://supportforums.cisco.com/message/963341#963341
http://www.cisco.com/en/US/products/hw/switches/ps700/products_configuration_example09186a008010edab.shtml
http://www.cisco.com/en/US/products/hw/switches/ps700/products_configuration_example09186a008010edab.shtml#backinfo1
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Alphonse

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Good Luck

Jumbo Frame iSCSI

I am using iSCSI for backup to disk. The target is SUSE 10 and initiator
is NW 6.5 sp7. The speed isn't so great, so I'm trying to make sure I've
got Jumbo frames setup properly. I've added the switch Jumbo=9000 to my
netinfo.cfg file, as per a post here by Massimo from 15-Aug-2007.
So the load network card line looks like this:
LOAD B57 NAME=B57_1_EII_EII FRAME=Ethernet_II SLOT=10019 Speed=AUTO
RxBuffers=200 Jumbo=9000
But when I look in Monitor > LAN/WAN Drivers the Jumbo Packet Size
(bytes) still reads 0. So, I don't think I'm getting Jumbo frames happening.
I've also set the following:
TCP delayed acknowledgement =on
tcp nagle algorithm=on
tcp minshall algorithm=on
set tcp maximum inital receive window = 64
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set maximum physical receive pacet size = 1800
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Massimo Rosen wrote:
> Hi,
>
> Doug wrote:
>> I am using iSCSI for backup to disk. The target is SUSE 10 and initiator
>> is NW 6.5 sp7. The speed isn't so great, so I'm trying to make sure I've
>> got Jumbo frames setup properly. I've added the switch Jumbo=9000 to my
>> netinfo.cfg file, as per a post here by Massimo from 15-Aug-2007.
>>
>> So the load network card line looks like this:
>>
>> LOAD B57 NAME=B57_1_EII_EII FRAME=Ethernet_II SLOT=10019 Speed=AUTO
>> RxBuffers=200 Jumbo=9000
>
> That looks good. Yre you sure this is the first load line for that nic?
>
>
>> Can anyone help me figure this out?
>
> Well, you already got the question about your switch, but what about the
> Target? Are you sure it can really do Jumbo Frames? If all else fails,
> take a lan trace of a tcp connection setup, and you wil see which frame
> size is advertised by each side.
>
> CU,
Yes the target is doing jumbo frames. I set the MTU to 9000, and the
Windows box saw a good improvement on speed.
Here's the netinfo.cfg file.
#!VERSION=2.3
#! --- WARNING -- WARNING -- WARNING -- WARNING -- WARNING -- WARNING ----
#! This file was created by the Internetworking Configuration Console.
#! It is intended to be modified ONLY by the configurator (INETCFG.NLM).
#! Tampering with this file may cause severe malfunctioning of the system.
#! The configurator will check for tampering and abort if it is detected.
#!SERVERTYPE=NORMAL
#!UIMODE=NORMAL
#!BEGINGENLOAD
LOAD SNMP
LOAD BCALLSRV
#!END
#!BEGINTSMLOAD
#!END
#!BEGINBOARD DRVR=B57 NAME=B57_2_EII STATUS=ENABLED NUMPORTS=1
DRVRTYPE=LAN VARIABLEPORTS=NO PORTPARAM=CHANNEL SLOT=10020 Speed=AUTO
RxBuffers=200
#!BEGINPORT NAME=B57_2_EII NUMBER=1 STATUS=ENABLED FRAMES=YES NUMLINKS=0
MEDIA=EtherTsm WANFRAME=UNCONFIGURED
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LOAD B57 NAME=B57_2_EII_EII FRAME=Ethernet_II SLOT=10020 Speed=AUTO
RxBuffers=200 Jumbo=9000
#!END
#!END
#!BEGINBOARD DRVR=B57 NAME=B57_1_EII STATUS=ENABLED NUMPORTS=1
DRVRTYPE=LAN VARIABLEPORTS=NO PORTPARAM=CHANNEL SLOT=10019 Speed=AUTO
RxBuffers=200
#!BEGINPORT NAME=B57_1_EII NUMBER=1 STATUS=ENABLED FRAMES=YES NUMLINKS=0
MEDIA=EtherTsm WANFRAME=UNCONFIGURED
#!REFCOUNT=1
LOAD B57 NAME=B57_1_EII_EII FRAME=Ethernet_II SLOT=10019 Speed=AUTO
RxBuffers=200 Jumbo=9000
#!END
#!END
#!BEGINPROTO PROTO=TCPIP STATUS=ENABLED
LOAD Tcpip RIP=No Static=Yes LoadSharing=No Forward=No VIPASupport=No
#!BEGINBIND STATUS=ENABLED
BIND IP B57_2_EII_EII ADDRESS=xxx.xxx.xxx.xxx MASK=255.255.255.0
#xxx.xxx.xxx.xxx
#!END
#!BEGINBIND STATUS=ENABLED
BIND IP B57_1_EII_EII ADDRESS=xxx.xxx.xxx.xxx MASK=255.255.255.0
#xxx.xxx.xxx.xxx
#!END
#!END

Linksys SE2800 and jumbo frames

Does the Linksys SE2800 gigabit 8 port switch support jumbo frames? Anyone have this switch? Any issues? Looking to replace a netgear gigabit switch that likes to forget that it has gigabit machines connected to it.

Hi Michael,
Actually had a chat with a colleague at linksys regarding your question, but he referred me to a datasheet, which left me with the question I started with. The technician said yes it suppported Jumbo frames but he could post me nothing in black and white..
Why not look at the Cisco Small Business umnanaged product the SG100D-08. It offers as the datasheet suggets;
Peace of mind:
All Cisco 100 Series switches are protected for the life of the product by the Cisco Limited Lifetime Hardware Warranty
Also, even though an unmanaged product, this series supports such features as;
1. Green Energy—Efficient Technology
The Cisco SG 100D-08 switch supports Green Energy-efficient
Technology. It can enter sleep mode, turn off unused ports, and adjust
power as needed. This increases energy efficiency to help businesses use
less power and save money.
2. Jumbo Frame Support
The Cisco SG 100D-08 switch supports frames up to 9,000 bytes called
jumbo frames. Jumbo Frame support improves network throughput and
reduces CPU utilization during large file transfers, such as multimedia files,
by allowing larger payloads in each packet.
regards Dave

Does the RVS4000 support Jumbo Frames?

I couldn't find on Cisco's site/specs whether the router handle jumbo frames. Anyone know if it does?

"Jumbo Frames" is a basic requirement of the Gigabit Ethernet specification. What you are saying is that the WRT350N does not actually function as a gigabit device. Sure enough it connects as one but does not transfer data at its native gigabit speed.
10Mbit connections can transfer up to around 1.2Mbytes per second.
100Mbit can transfer at around 12Mbytes per second
1000Mbit/Gigabit is supposed too transfer at up to 120Mbytes per second but cannot achieve this unless jumbo frames are active.
I beleive this gives me grounds to get a refund for a mis-sold product.
So, I guess the question needs to be re-asked.
Will the firmware ever be updated to support actual Gigabit speeds ?

Does the wrt350n support jumbo frames?

Does the wrt350n support jumbo frames? Maybe in an upcoming firmware? thanks in advance

"Jumbo Frames" is a basic requirement of the Gigabit Ethernet specification. What you are saying is that the WRT350N does not actually function as a gigabit device. Sure enough it connects as one but does not transfer data at its native gigabit speed.
10Mbit connections can transfer up to around 1.2Mbytes per second.
100Mbit can transfer at around 12Mbytes per second
1000Mbit/Gigabit is supposed too transfer at up to 120Mbytes per second but cannot achieve this unless jumbo frames are active.
I beleive this gives me grounds to get a refund for a mis-sold product.
So, I guess the question needs to be re-asked.
Will the firmware ever be updated to support actual Gigabit speeds ?

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