MTU related issues with FRoMPLS

Hi Folks,
While using FRoMPLS I am experiencing limitations in the Edge MTU. The
edge MTU is limited to 1492 bytes above which the packets are droped. The MPLS MTU between PE routers has been changed to 1526 bytes. I understand AToM does not do fragmentation. I did see a workaround in he Web saying increasing the Core MTU to carry the Edge MTU of 1500. This does not seem to work. Any change in the core MTU does not reflect in the edge MTU. Can anyone help me isolae the issue.
thanks in advance
ashraf

the way i usually solves these kind of issues of mtu is:
if you suspect the problem is somwhere in your core between both pe routers
change the atom mpls implementation just for the diagnostic to be a layer3 vpn then from the ce do an extended ping where you set the df bit to 1 and the size to 1500 so routers in the core will not fragment the packet then do "debug ip icmp" on the ce and then ping the other ce
the result of this action is you will see with the debug the hop that cannot do fragmentation .(icmp cannot fragment)
and on these routers in your core you should concentrate and change the mtu with the t"ag-switching mtu 1526" command.
from my experience sometimes usually on ethernet interfaces (not giga)and regular serial if you enlarge the mtu it is not inuff you should also shut and unshut the interface and sometimes even reload the router.so i hope large part of your core is pos and giga.
also because atom does not support fragnentation make sure each link connecting the ce to pe on both sides have the same mtu
after you see that with a layer 3 vpn there is no fragmentation then switch back to atom.
good luck
guy

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    There are no unsual add-ins to Outlook
    Outgoing email virus scanning is disabled
    Outlook is NOT integrated with Lync
    The OST file is around 1.7 GBytes is size.
    I have recreated the Outlook profile twice but this made no difference
    Switched OFF "Cached Exchange Mode" - this made things worse !
    The Outlook address book is set to \Offline Global Address List
    I have disabled with Windows firewall on the client PC - no change
    I have adjusted the KeepAliveTime for packets in the registry of the PC to 20 minutes
    Changes that reduced the frequency of "Not Responding"
    I have changed the Outlook automatic Send/Receive time from 30 to 10 minutes - this seemed to help 
    Possible Related Problem
    I have attempted to download the offline address book manually - this hangs at "Copying offline address book template file" in the Send/Receive dialog and there a NO OAB files in the data file location on the PC. 
    So the only measure that has so far "helped" has been the Outlook Send/Receive time change - now set to 10 minutes. Even so, Outlook will occasionally go "Not Responding" for 30 minutes or more (no windows active - only option
    is to close and reopen Outlook).
    There does seem to be a problem with the Offline Address book. I can download this ok for this user on my home PC (Outlook 2010) but this will not download manually on the work pc with Outlook 2013 (despite following all the debug steps above).
    On work PC I can see literally hundreds of "Schannel" errors in the Windows System event logs - 
    Error - Event 36888 Schannel
    The following fatal error was generated :10
    The internal error state is 10
    These errors occur every 2-4 minutes continually all the time Outlook is running. When Outlook is closed the "Schannel" errors stop !
    Can anyone suggest what else to try, please ?
    I have already investigated this issue on the Office 365 Community Forum, and the Outlook forum and they suggested that it was a client (i.e Outlook) issue and that I should post here for further information.
    Thanks for reading !

    An update to this problem.
    I brought one of the office PCs back to my home network and connected it up there. With no changes to the PC I was immediately able to download the Offline Address Book without errors.
    This suggests to me that there must be some problem with the internet connection or router setup in the office environment.
    The router is a TP-LINK W8970. The internet connection is PPPoA. I have seen some suggestion that an SPI firewall can cause issues. This router has an SPI firewall but this feature is disabled on the router.
    While investigating this issue I have frequently been connected remotely to an office PC - sometimes for up to an hour or more. During these periods I have not experienced any connection dropouts so the actual internet connection seems to be ok (i.e. it is
    not dropping out). 
    However, something seems to be preventing the Outlook client from connecting properly with the Office 365 Exchange server in the office environment - or something is dropping the connection to Outlook. Does anyone know of any router settings that might affect
    this ?
    I could try changing the office router but I do not have a spare available. Can anyone suggest a reasonably low cost, currenbtly available router that they know definitely works in the Office 365 environment so that I could buy this for test purposes ?

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