[c-nsp] MTU settings on GSR linecard 3GE-GBIC-SC

[Oliver Boehmer (oboehmer)]

Jan Sandmaier <> wrote on Monday, March 30, 2009 15:29:

> Hi,
> 
> does anybody know the reason why I can configure a 9180 byte MTU on
> port 0 and 1 on a GSR 3-port Gigabit Ethernet port (3GE-GBIC-SC) but
> only 4470 byte on the third port. I use IOS 12.0(32)S12 and
> 12.0(31)S6. 

this is a hardware limitiation on the FPGA (limited RX Fifo buffers) on
this Engine2 LC. Max MTU on the third port depends on the settings on
the other two, so you can't even go up to 4470 if you set the first to
9k..

	oli