The MPLS-OPS Archive

[Garry Glendown <garry@regio.net>]

Gupta, Shailendra wrote:
> Do you also have Fast Ethernet Port on this? If yes, whether that allows 
> change of MTU.

Yes it does. No it doesn't.

switch1.ffm4(config)#int fa0/1
switch1.ffm4(config-if)#mtu 1512
% Interface FastEthernet0/1 does not support user settable mtu.

> Please search CCO & I am sure this limitation & possible resolution must 
> be listed on the site. In Between, I also doubt that "Telenet" would 
> pose any such MTU related issue, being small byte packet(<1500 Bytes]. 

The problem occured e.g. during WWW access ... I just used telnet to 
port 80 for some testing ...

I also just noticed that the router I'm running as PE also doesn't 
support an MTU bigger than 1500 ... though the output puzzles me a bit:

active-gw(config)#int fa5/0
active-gw(config-if)#mtu ?
   <64-17944>  MTU size in bytes

active-gw(config-if)#mtu 1512
% Interface FastEthernet5/0 does not support user settable mtu.

This is a 7206 w/ 12.0(7)S ...

If I understand the MPLS reading I did correctly, I will need to have an 
MTU of at least 1508 or 1512 in order to allow MPLS due to label and 
label stacking (want to do MPLS VPN) ...

Any ideas?

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