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https://community.cisco.com/t5/switching/interface-fastethernet0-0-does-not-support-user-settable-mtu/td-p/1628063
% Interface FastEthernet0/0 does not support user settable mtu As Alain already asked you about the IP MTU command, have to tried to issue on router? Please could you let us know what eaxctly your need to we can suggest you any other option (Any issue with any routing protocol or something.
https://learningnetwork.cisco.com/thread/70875
May 20, 2014 · R1(config-if)#mtu 1300 % Interface FastEthernet0/0 does not support user settable mtu. R1(config-if)# Whereas the same as been accepted in PT. Router5(config-if)#mtu 1300. Router5(config-if)#do show int fa 0/0. FastEthernet0/0 is up, line protocol is up (connected) Hardware is Lance, address is 000c.85c9.1801 (bia 000c.85c9.1801)
https://evilttl.com/wiki/mtu-on-cisco-routers
% Interface FastEthernet0 / 0 does not support user settable mtu. The same refers to switch interface cards. To check L3 MTU on an interface issue sh ip int {if-number} .
https://community.cisco.com/t5/routing/cisco-1841-mtu-size-on-fastethernet/td-p/983350
Im using a Cisco 1841 where FastEthernet0/0 is the customers LAN, and FastEhternet0/1 is the WAN uplink. When im trying to set the wan uplink to mtu size 1524 i get the following error: % Interface FastEthernet0/1 does not support user settable mtu.
https://quickview.cloudapps.cisco.com/quickview/bug/CSCuz58508
Nov 27, 2019 · Description (partial) Symptom: Configuring MTU size for interfaces results in a message to console: % Interface GigabitEthernet1 does not support user settable MTU. Conditions: CSR1000v running Denali-16.3.1 and attempting to configure interface MTU size for interfaces that rely on polled mode drivers. Determining if an interface uses...
https://www.experts-exchange.com/questions/27047799/How-can-I-change-MTU-on-FastEthernet-port-Cisco-7206.html
% Interface FastEthernet0/0 does not support user settable mtu. Therefore the MTU defined under the show commands is 1500 which is the MTU for the Ethernet Payload, not …
https://community.cisco.com/t5/mpls/mtu-size-issue/td-p/532967
I got the bug and it was on 1 P-P connection; there was 1 ethernet interface of a carrier (this I forgot to describe in 1st msg , sorry) that I was not able to interfere to change it's MTU(1500) . So I decided to disable MPLS on this link , then it worked .
https://ieoc.com/discussion/6244/mtu-change
I need to change the mtu size on a router interface and I have some problems. So I have 2 questions: First one:-----Does anyone know why I can't change the mtu interface with this command ? Router(config-if)#mtu 9216 % Interface FastEthernet0/0 does not support user settable mtu. Router(config-if)# Second one:-----
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