On Friday, November 19, 2010 05:20:49 am Pshem Kowalczyk wrote: > Yet another update. I turns out that the old 'turn it off > and on again' worked. After I reload the box I got the > MTU of the subinterfaces at 4400, which is good. I still > had to use clns mtu (of 4379) to make it work.
Which box did you "reload"? The ASR1000, or both? I've found, in the past, that it has been necessary to bump the interface on which an MTU change has been applied, for that change to take effect, regardless of what "show interface" displays. I'm not sure if this applies to all versions of IOS, or just a few, but on the 7200's that we've worked with, it's been needed the few times we've had to do it. I can't say whether it's common to do so these days, as we normally pre-stage boxes before they are connected to the network, so a change in link state effects whatever MTU has been configured at the time of connection. As for IOS XR, we haven't had to bump interfaces to get MTU's to change. Obviously, the worst case is when you have to reboot the Catalyst switches when the system MTU for interfaces is changed. Luckily for you, your switch in between both boxes was good to go. Cheers, Mark.
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