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https://learningnetwork.cisco.com/thread/70875
May 20, 2014 · And even if i'm trying to give the mtu value less than 1500, it is not accepting. R2(config-if)#mtu 1000 % Interface FastEthernet0/0 does not support user settable mtu. And i tried to setup ip mtu 1000, but i didn't see it changed here: I think i should know the diff. R2(config-if)#ip mtu 1000. R2(config-if)#do show int fa 0/0
https://evilttl.com/wiki/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: r1(config-if)#mtu 1500. % Interface FastEthernet0/0 does not support user settable mtu.
https://community.cisco.com/t5/switching/interface-fastethernet0-0-does-not-support-user-settable-mtu/td-p/1628063
Dears good morning! I have try issue the command mtu 1520, but It not accept how can you see below: router.rjo(config-if)#mtu 1520 % Interface FastEthernet0/0 does not support user settable mtu. Follow some informations: show diag Slot 0: Dual
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 following show command: …
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://ieoc.com/discussion/6244/mtu-change
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:-----what is the difference between these 2 commandes: Router(config-if)#mtu bytes . and. Router(config-if)# ip mtu bytes. Thank you very much for your ...
https://www.experts-exchange.com/questions/27047799/How-can-I-change-MTU-on-FastEthernet-port-Cisco-7206.html
How can I change MTU on FastEthernet port (Cisco 7206) ... % 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 including the Ethernet Headers. I have taken the following from an IETF internet draft supporting the case for larger ...
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.
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