I know there was a bug that is fixed in 12.2(18)SXE an that had for consequence that you could configure the "mpls mtu" command but it wouldn't really have any effect if the value configured was bigger than the interface mtu.
You could either upgrade or the work around is to increase the interface mtu instead of the mpls mtu.
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I have thought that increasing the interface MTU will solve the issue. However I cant increase int MTU on the 7606 since its connected to another P router which is cisco 7507 Ge (which we cant change the int MTU).
I believe this will also impact other Ethernet interfaces that the MTU cant be changed.
In my cases, we uses 7606 WS-6724 as aggreation which connected to many other routers. Many of its interface cant changed the MTU. If we run VPLS, EToM, it will 'chock' the packet size.
The interface MTU itself is 1500, thus the IP will follow this as default, is it? How about for MPLS IP which requieres at least 1508 bytes? Ussually we will increase the MPLS MTU. In my case, WS-6724, it seems it doest really take effect of my configs, even i have increase the MPLS MTU.
in the tsting lab, i have connected 7206 G-1 to the 7606 and the result is still the same. if i connect the 7206 to Ge interface on the sup720 on 7606, no mtu issue. it just happen if connect it to the ws-6724 module.
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