02-27-2020 01:33 PM
Can someone tell me the difference between the following config? Why the first MTU shows 17862 bytes besides the fact that actual MTU of an interface is 1422 bytes.
MTU 17862 bytes, BW 100 Kbit/sec, DLY 50000 usec
02-27-2020 02:07 PM
Hello,
which router model and which IOS is this on ?
02-27-2020 06:44 PM
Hi,
This is cisco3925-chassis and running on C3900e Software (C3900e-UNIVERSALK9-M), Version 15.2(4)M6a
03-12-2020 12:36 PM
Hi,
In the newer IOS versions, the GRE tunnel interface MTU is now visible under "Tunnel Transport MTU". The other, additional MTU value you're seeing has nothing to do with MTU, an unfortunate naming, it is based on the platform/physical interface buffers, thus the value you'll see there will vary between platforms.
Regards,
Cristian Matei.
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