02-06-2005 01:08 AM
Anybody knows if the MTU for the FastEthernet interface on the C7200-I/O-2FE/E can be changed ?
I'm planning on implementing MPLS/VPNs using the FA Port as a MPLS Trunk and I need to change de MTU.
02-06-2005 01:44 AM
Hi,
Not so sure about this on FastEthernet on any cisco routers, I've tried to change the MTU size but couldn't, perhaps required to specific IOS?
regards,
maher
02-07-2005 07:37 AM
Have you tried using the IP MTU and MPLS MTU commands?
These two commands should allow you to adjust the MTU for unlabeled IP packets (IP MTU) and labeled packets (MPLS MTU).
IP MTU Command Reference:
MPLS MTU Command Reference:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/swtch_r/swi_m2.htm#wp1150889
Hope this helps.
02-24-2005 07:26 AM
Hi
As I know you can't change the MTU on I/O card. You should use PAs to increase MTU.
After you change MTU (layer2) you are allowed to give more tag-switching MTU.
I hope this help.
04-18-2005 09:33 PM
7204_ZOFR_I#sh ver
Cisco IOS Software, 7200 Software (C7200-K91P-M), Version 12.2(25)S3, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Thu 03-Mar-05 17:21 by ccai
ROM: System Bootstrap, Version 12.2(4r)B2, RELEASE SOFTWARE (fc2)
BOOTLDR: Cisco IOS Software, 7200 Software (C7200-KBOOT-M), Version 12.2(25)S3, RELEASE SOFTWARE (fc1)
7204_ZOFR_I uptime is 2 weeks, 5 days, 13 hours, 25 minutes
System returned to ROM by power-on
System restarted at 11:06:20 COL Wed Mar 30 2005
System image file is "disk0:c7200-k91p-mz.122-25.S3.bin"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
Cisco 7204VXR (NPE400) processor (revision B) with 114688K/16384K bytes of memory.
Processor board ID 32824457
R7000 CPU at 350Mhz, Implementation 39, Rev 3.3, 256KB L2 Cache
4 slot VXR midplane, Version 2.9
Last reset from power-on
2 FastEthernet interfaces
125K bytes of NVRAM.
62976K 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
7204_ZOFR_I#sh run int fa0/0
Building configuration...
Current configuration : 121 bytes
!
interface FastEthernet0/1
ip address 10.85.237.10 255.255.255.240
duplex auto
speed auto
no clns route-cache
end
7204_ZOFR_I#conf t
Enter configuration commands, one per line. End with CNTL/Z.
7204_ZOFR_I(config)#int fa0/1
7204_ZOFR_I(config-if)#mtu 2000
% Interface FastEthernet0/1 does not support user settable mtu.
hope this helps!!!!!!!!!!
08-29-2020 03:41 AM
shows same error
% Interface FastEthernet0/1 does not support user settable mtu.
09-03-2020 12:54 AM
Hello,
FastEthernet interfaces on C7200 do not support user settable mtu.
In MPLS environment you can overcome this issue by configuring "mpls mtu" under interface configuration mode. The mpls mtu can be higher than the physical mtu. On C7200 with your IOS version you can use either "mpls mtu", or "tag-switching mtu" command
!
interface FastEthernet0/1
mpls label protocol ldp
tag-switching mtu 1512
tag-switching ip
!
After configuration, you can check the mpls mtu using "show mpls interfaces FastEthernet0/1 detail" command.
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