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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://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 …
https://evilttl.com/wiki/mtu-on-cisco-routers
mtu on cisco routers. Speaking about MTUs on routers it has to be emphasized that changing L2 MTU on an interface is not supported. If you try to change L2 MTU on an interface, you will possibly see the following message: % Interface FastEthernet0/0 does not support user settable mtu.
https://community.cisco.com/t5/switching/no-able-to-set-mtu-for-jumbo-frames/td-p/1321012
Cisco Community: Technology and Support: Networking: Switching: No able to set MTU for jumbo frames
https://quickview.cloudapps.cisco.com/quickview/bug/CSCtb78261
Jan 24, 2017 · Symptom: It is problem that the customer does not set MTU on management port. The MTU cannot set the numerical value of 1500 or more. ----- Cat4900M#conf t Enter configuration commands, one per line. End with CNTL/Z. Cat4900M(config)#int fa1 Cat4900M(config-if)#mtu ? <64-9198> MTU size in bytes Cat4900M(config-if)#mtu 1518 % Interface FastEthernet1 does not support user settable mtu.
https://community.cisco.com/t5/mpls/mtu-problems-with-mpls/td-p/322361
It talks about this problem in MPLS and VPN Arch Vol II, and specifies that procedure and says that this indicates a failure of either a LSP or a switch that doesn't support baby giants. As my switch does support them appropriately, I am thinking it is the PA at fault, but I can find no documentation about what MTU it supports and whether MPLS works through it.
https://networklessons.com/cisco/ccie-routing-switching/pppoe-mtu-troubleshooting-cisco-ios
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. This means that a single Ethernet frame can carry up to 1500 bytes of data. On top of this data we add the Ethernet header.
https://community.cisco.com/t5/vpn-and-anyconnect/difference-between-interface-mtu-and-ip-mtu/td-p/650311
Solved: hi all can some pls tell me the difference between interface mtu and ip mtu. the confusion i feel is when we set the physical mtu it going to affect the ip packets anyway right then why do we have the ip mtu option. can someone pls explain
https://quickview.cloudapps.cisco.com/quickview/bug/CSCuz58508
Nov 27, 2019 · 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 a polled mode driver is done by using the …
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