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STUART KENDRICK
Beginner

jumbo frames / SG 200-08 / not forwarding

Does anyone have jumbo frames running on this switch?

Using ICMP Echo as my test protocol, I can reach 1552 bytes in frame size ... but at 1553 and beyond (1578, 1932, 2090, 4138, 8978, 9014) , the switch swallows them.

When I physically swap out the SG 200-8 with an HP-1810 configured to support jumbo frames, those frame sizes above slide through just fine, and ICMP Echo Replies return just fine.

On the SG-200, I'm using Administration.., Port Management, Port Settings, {click on a port}, Edit... to modify MTU size.  I don't see any 'Enable Jumbo Frames' box that wants checking anywhere.

SG 200-08

Boot version 1.0.0.12

Firmware version 1.0.7.4

 

?

--sk

1 ACCEPTED SOLUTION

Accepted Solutions
V K Moorthy
Beginner

Hi,

SG200-08 don't support Jumbo frames.Only SG200-24 and SG200-48 models will support jumbo frames.

 

Refer link below:(page no:5):

 

http://www.cisco.com/c/dam/en/us/td/docs/switches/lan/csbss/slm2024/administration/guide/SLM_Admin_Guide_Publish.pdf

 

regards

Moorthy

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3 REPLIES 3
V K Moorthy
Beginner

Hi,

SG200-08 don't support Jumbo frames.Only SG200-24 and SG200-48 models will support jumbo frames.

 

Refer link below:(page no:5):

 

http://www.cisco.com/c/dam/en/us/td/docs/switches/lan/csbss/slm2024/administration/guide/SLM_Admin_Guide_Publish.pdf

 

regards

Moorthy

That document is not relevant to the OP's issue.  That document is referring to other SLM switches, not SG switches.  The SG-200-08 DOES support jumbo frames (hence the setting to change MTU to 9000+), however, there is a security feature blocking pings over 1500.  I don't know how to disable that setting.  In fact, if anyone knows that would be a huge help.

https://www.cisco.com/c/en/us/support/docs/smb/switches/cisco-small-business-200-series-managed-switches/smb2653-prevention-of-icmp-jumbo-frames-on-the-sg200-300-series-mana.html

 

Use the web configuration utility to configure jumbo frames, and choose Port management > Port Settings and choose Security > Denial of Service Prevention > Security Suite Settings to configure DoS prevention.


Maybe disabling the DdoS Prevention is a workaround?

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