Hi, On Thu, Aug 06, 2009 at 02:57:11PM -0700, Christopher Hunt wrote: > I'm trying to configure "mpls mtu 1508" on a dot1q subinterface on a > 2851. IOS 12.4(7) will allow it, but IOS 12.4(22)T won't.
Quite possibly you need to configure "mtu 1508" and then "ip mtu 1500"
to get the desired behaviour - "standard" IOS wants a maximum interface
MTU, and all protocols (ip, mpls, ...) can go up to that maximum, but not
further.
Being able to set "mpls mtu" to a value larger than the generic interface
MTU was a workaround for some issues on single-port 7200 FEs, if I remember
correctly, and should not be needed for 2800s anyway.
gert
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