06-28-2002 05:27 AM - edited 03-01-2019 11:08 PM
Greetings, Im seeking some assistance with increasing MTU on a Catalyst 2950 switch. I want to be able to pass packets of 1522 max. I have accomplished this in the past using a Catalyst 2912 Switch with commands: conf term, int fa0/port # and mtu 1522 this does not seem to work on the Catalyst 2950. Can you assist me in accomplishing this with the Catalyst 2950? Thanking you in advance.
Jason Chin
06-28-2002 07:04 AM
You need to increase MTU usingsystem mtu global configuration command
http://cio.cisco.com/univercd/cc/td/doc/product/lan/cat2950/1219ea1/cli/cli2.htm#xtocid83
There was a bug filed for similar issue on 3550. The bug ID is CSCdw07890 and is fixed in 12.1(9)EA1
06-28-2002 08:22 AM
HI, thanks for all the help so far. I tried running the system mtu 1522 command as suggested in the documentation at the url you posted but my switch does not recognise "system" as a valid command.
catalyst-1>enable
Password:
catalyst-1#conf term
Enter configuration commands, one per line. End with CNTL/Z.
catalyst-1(config)#system mtu 1533
^
% Invalid input detected at '^' marker.
I believe the command was first introduced with Release 12.1(6)EA2 but im running Version 12.0(5.3)WC(1).
Cisco Internetwork Operating System Software
IOS (tm) C2950 Software (C2950-C3H2S-M), Version 12.0(5.3)WC(1)
-Jason
06-28-2002 10:30 AM
That is correct. You need to be running atleast 12.1(6)EA2 but I suggest 12.1(9)EA1c
06-28-2002 11:43 AM
I downloaded and TFTPed c2950-i6q4l2-tar.121-9.EA1.tar into my switch. All i need to do now is a reboot, i will do it later when usage drops. Thanks again for the help.
06-30-2002 05:07 PM
Hi, im still having problems setting the MTU on my Catalyst 2950, I upgraded the IOS to Version 12.1(9)EA1. So the "system" command is now recognised but i cant alter the MTU value. The MTU range is 1500 - 1500.
catalyst-1#conf term
Enter configuration commands, one per line. End with CNTL/Z.
catalyst-1(config)#system mtu 1528
^
% Invalid input detected at '^' marker.
catalyst-1(config)#system mtu ?
<1500-1500> MTU size in bytes
catalyst-1(config)#
Any suggestions?
-Jason
06-30-2002 06:13 PM
Jason
Looks like you have the 2950C switch. Only 2950G's support the system mtu command
http://www.cisco.com/warp/customer/cc/pd/si/casi/ca2950/prodlit/c29ie_ds.htm
Here is the output from a 2950G switch
2950G-48-3A#conf terminal
Enter configuration commands, one per line. End with CNTL/Z.
2950G-48-3A(config)#system mtu 1528
2950G-48-3A(config)#end
2950G-48-3A#sh sy
1w2d: %SYS-5-CONFIG_I: Configured from console by consoles
2950G-48-3A#sh system mtu
System MTU size is 1528 bytes
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