Hi all, i was tweaking the mtu value per interface to see how ospf reacts to it. the question here is not related to that, rather related to the fact that i do not see the mtu value changed in "show interface s0/0".. Mtu troubleshooting on cisco ios. posted on february 27, 2014; maximum transmission unit (mtu) is the largest size in bytes that a certain layer can forward. the mtu is different for each protocol and medium that we use. ethernet for example has a mtu of 1500 bytes by default.. Craig, there are two different mtu settings: l3 mtu - is the maximum size of ip packet that a routed port can handle and l2 mtu - it is the maximum ethernet frame that switch can forward. the latter on 3650 switch can only be adjusted globally, not per port..
Once that size is found, the transmitting host will simply fix the mtu size. if i'm not mistaken, if a device along the path does not support path mtu discovery, then the transmitting host is supposed to use mtu size of 576 bytes.. Configuring the interface mtu. by default, any ethernet interface has its maximum transmission unit (mtu) size set to 1500 bytes, which is the maximum and expected value for ethernet frames. if a packet is larger than the mtu, it must be fragmented before being transmitted.. Evil_ttl> show | s . mtu on cisco switches category:cisco systems -> routing and switching. there are 3 types of mtu that can be configured on a switch: layer 2 mtu that affects 10 and 100mbit/s interfaces of a switch. system jumbo mtu size is 1504 bytes routing mtu size is 1500 bytes ..
