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% Interface FastEthernet0/0 does not support user settable mtu.

silviorodrigues
Level 1
Level 1

Dears good morning!

I have try issue the command mtu 1520, but It not accept how can you see below:

router.rjo(config-if)#mtu 1520
% Interface FastEthernet0/0 does not support user settable mtu.

Follow some informations:

show diag
Slot 0:
        Dual FastEthernet (RJ-45) I/O Card Port adapter, 2 ports
        Port adapter is analyzed
        Port adapter insertion time 7w6d ago
        EEPROM contents at hardware discovery:
        Hardware Revision        : 1.2
        Top Assy. Part Number    : 800-07114-04
        Part Number              : 73-5003-04
        Board Revision           : A0
        PCB Serial Number        : 21006671
        RMA History              : 00
        Fab Version              : 02
        Fab Part Number          : 28-3455-02
        Product (FRU) Number     : C7200-I/O-2FE/E
        Board Revision           :
        IDPROM FIELD FORMAT ERROR, index 0x40
        EEPROM format version 4
        EEPROM contents (hex):
          0x00: 04 FF 40 02 15 41 01 02 C0 46 03 20 00 1B CA 04
          0x10: 82 49 13 8B 04 42 41 30 C1 8B 32 31 30 30 36 36
          0x20: 37 31 00 00 00 04 00 02 02 85 1C 0D 7F 02 CB 8F
          0x30: 43 37 32 30 30 2D 49 2F 4F 2D 32 46 45 2F 45 42
          0x40: 00 00 00 00 FF FF FF FF FF FF FF FF FF FF FF FF
          0x50: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
          0x60: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
          0x70: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF

Cisco Internetwork Operating System Software
IOS (tm) 7200 Software (C7200-P-M), Version 12.3(24), RELEASE SOFTWARE (fc4)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by cisco Systems, Inc.
Compiled Thu 18-Oct-07 19:37 by stshen
Image text-base: 0x60008AF4, data-base: 0x61A75630

ROM: System Bootstrap, Version 12.2(4r)B, RELEASE SOFTWARE (fc1)
BOOTLDR: 7200 Software (C7200-KBOOT-M), Version 12.1(7)E, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

core02.rjo uptime is 7 weeks, 6 days, 6 hours, 33 minutes
System returned to ROM by reload at 10:57:41 UTC Mon Apr 12 2010
System image file is "disk0:c7200-p-mz.123-24.bin"
Last reload reason: Unknown reason


cisco 7206VXR (NPE400) processor (revision A) with 491520K/32768K bytes of memory.
Processor board ID 26793764
R7000 CPU at 350MHz, Implementation 39, Rev 3.3, 256KB L2 Cache
6 slot VXR midplane, Version 2.6

Last reset from power-on
X.25 software, Version 3.0.0.
Bridging software.

PCI bus mb0_mb1 (Slots 0, 1, 3 and 5) has a capacity of 600 bandwidth points.
Current configuration on bus mb0_mb1 has a total of 400 bandwidth points.
This configuration is within the PCI bus capacity and is supported.

PCI bus mb2 (Slots 2, 4, 6) has a capacity of 600 bandwidth points.
Current configuration on bus mb2 has a total of 0 bandwidth points
This configuration is within the PCI bus capacity and is supported.

Please refer to the following document "Cisco 7200 Series Port Adaptor
Hardware Configuration Guidelines" on Cisco.com <http://www.cisco.com>
for c7200 bandwidth points oversubscription and usage guidelines.


2 FastEthernet/IEEE 802.3 interface(s)
4 Serial network interface(s)
125K bytes of non-volatile configuration memory.

125440K bytes of ATA PCMCIA card at slot 0 (Sector size 512 bytes).
8192K bytes of Flash internal SIMM (Sector size 256K).
Configuration register is 0x2102

Anyone can help me undestund why this ?

Thanks

3 Replies 3

cadet alain
VIP Alumni
VIP Alumni

Hi,

What about ip mtu command?

Regards.

Alain.

Don't forget to rate helpful posts.

Hi Silvio,

As you facing below Error Due to your IOS Image which doesn't allow to configured more than MTU on interface.

router.rjo(config-if)#mtu 1520
% Interface FastEthernet0/0 does not support user settable mtu

As Alain already asked you about the IP MTU command, have to tried to issue on router?

Please could you let us know what eaxctly your  need to we can suggest you any other option (Any issue with any routing protocol or something.

Please have a look if would like to know more about MTU how does Effect:

http://www.cisco.com/en/US/tech/tk827/tk369/technologies_white_paper09186a00800d6979.shtml

Hoping your response Soon.

Thank you

Ajay

Silvio Rodrigues

silviorodrigues
Level 1
Level 1

Dears good morning!

I need this command because I want imput header mpls in this interface!

Thans alot!