[c-nsp] System MTU on Cisco 2950

[Ali Reza Nasim]

Hi

I am trying to set system mtu of more than 1500 bytes on Cisco 2950G but the
range I get is (1500-1500). The output of this switch:

 *Switch-02(config)#system mtu ?
  <1500-1500>  MTU size in bytes*

*
Switch-02#sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(14)EA1a, RELEASE
SOFTWARE (fc1)
Copyright (c) 1986-2003 by cisco Systems, Inc.
Compiled Tue 02-Sep-03 03:33 by antonino
Image text-base: 0x80010000, data-base: 0x805C0000*

*ROM: Bootstrap program is CALHOUN boot loader*

*Switch-02 uptime is 2 days, 15 hours, 50 minutes
System returned to ROM by power-on
System image file is "flash:/c2950-i6q4l2-mz.121-14.EA1a.bin"*

*cisco WS-C2950T-24 (RC32300) processor (revision H0) with 20710K bytes of
memory.
Processor board ID FOC0950ZAEX
Last reset from system-reset
Running Enhanced Image
24 FastEthernet/IEEE 802.3 interface(s)
2 Gigabit Ethernet/IEEE 802.3 interface(s)*

*32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:0C:58:69:74:C0
Motherboard assembly number: 73-6114-10
Power supply part number: 34-0965-01
Motherboard serial number: FOC08412CTA
Power supply serial number: DAB0838GVD2
Model revision number: H0
Motherboard revision number: A0
Model number: WS-C2950G-24-EI
System serial number: FOC0950ZAEX
Configuration register is 0xF*


The same IOS is loaded on another similar box and the mtu range (1500-1530)
is available here, as in the output below:

*2950G(config)#system mtu ?
  <1500-1530>  MTU size in bytes*

* 2950G#sh ver
Cisco Internetwork Operating System Software
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(14)EA1a, RELEASE
SOFTWARE (fc1)
Copyright (c) 1986-2003 by cisco Systems, Inc.
Compiled Tue 02-Sep-03 03:33 by antonino
Image text-base: 0x80010000, data-base: 0x805C0000*

*ROM: Bootstrap program is CALHOUN boot loader*

*2950G uptime is 1 year, 3 weeks, 6 days, 22 hours, 17 minutes
System returned to ROM by power-on
System restarted at 11:01:57 PKT Sun Jan 15 2006
System image file is "flash:/c2950-i6q4l2-mz.121-14.EA1a.bin"*

*cisco WS-C2950G-24-EI (RC32300) processor (revision H0) with 20710K bytes
of memory.
Processor board ID FOC0804X1RM
Last reset from system-reset
Running Enhanced Image
24 FastEthernet/IEEE 802.3 interface(s)
2 Gigabit Ethernet/IEEE 802.3 interface(s)*
*32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:0F:23:E8:25:80
Motherboard assembly number: 73-7280-05
Power supply part number: 34-0965-01
Motherboard serial number: FOC08050AXS
Power supply serial number: DAB08031PXZ
Model revision number: H0
Motherboard revision number: A0
Model number: WS-C2950G-24-EI
System serial number: FOC0804X1RM
Configuration register is 0xF*
**

Can anyone tell me why is this behaviour?

Regards