[c-nsp] cisco router 2800/3800 serie

[Erik Soosalu]

With some things neutered...

Cisco IOS Software, 1841 Software (C1841-SPSERVICESK9-M), Version
12.4(22)T1, RELEASE SOFTWARE (fc5)
Technical Support: http://www.cisco.com/techsupport

rt-02#sh ip int brief
Interface                  IP-Address      OK? Method Status
Protocol
FastEthernet0/1            10.1.254.14     YES NVRAM  up
up

rt-02#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
rt-02(config)#int fa 0/1
rt-02(config-if)#mtu ?
  <64-1600>  MTU size in bytes

rt-02(config-if)#mtu 1600
rt-02(config-if)#end
rt-02#sh run int fa 0/1
Building configuration...

Current configuration : 239 bytes
!
interface FastEthernet0/1
mtu 1600

Thanks,
Erik


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Peter Rathlev
Sent: Wednesday, August 26, 2009 2:41 PM
To: Justin Shore
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] cisco router 2800/3800 serie

On Wed, 2009-08-26 at 13:00 -0500, Justin Shore wrote:
> I'm suspect that the interface MTU of the 1841 may not go above 1500.

It's even worse, it doesn't seem to support MTU != 1500 at all on the
built in FE interfaces.

Router(config-if)#do sh ip int bri
Interface                  IP-Address      OK? Method Status
Protocol
FastEthernet0/0            10.251.9.5      YES NVRAM  up
up      
FastEthernet0/1            unassigned      YES NVRAM  administratively
down down    
ATM0/0/0                   unassigned      YES NVRAM  down
down    
Router(config-if)#int fa0/0
Router(config-if)#mtu 1501 
% Interface FastEthernet0/0 does not support user settable mtu.
Router(config-if)#int fa0/1
Router(config-if)#mtu 1501
% Interface FastEthernet0/1 does not support user settable mtu.
Router(config-if)#do sh ver | incl IOS
Cisco IOS Software, 1841 Software (C1841-BROADBAND-M), Version 12.4(1a),
RELEASE SOFTWARE (fc2)
Router(config-if)#

Outdated IOS but this MTU thingy probably hasn't changed.

Regards,
Peter


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