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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://www.cisco.com/c/en/us/support/docs/switches/catalyst-6000-series-switches/24048-148.html
Mar 24, 2005 · The Catalyst 2948G-L3 and 4908G-L3 series switches do not support a configurable MTU on either 10/100 or 1000. The MTU is therefore the default, which is 1500 bytes. Configure 2948G-L3(config)#int gig 49 2948G-L3(config-if)#mtu 2000 % Interface GigabitEthernet49 does not support user settable mtu. Verify
https://community.cisco.com/t5/switching/no-able-to-set-mtu-for-jumbo-frames/td-p/1321012
(config-if)#mtu 9189 % Interface GigabitEthernet2/29 does not support user settable mtu.
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 …
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) When I enter following commands #interface fastEthernet 0/0 #mtu 1524 I see next message % Interface FastEthernet0/0 does not support user settable mtu.
https://www.cisco.com/c/en/us/td/docs/ios/bridging/configuration/guide/15_1s/br_15_1s_book/br_sna_swtich_svc.html
User-Settable Port Limits . ... For example, if you change an interface MAC address or MTU, SNASw may not recognize the new value. If you want to make changes to an interface and want SNASw to adjust to the new interface changes, you may need to either delete and redefine the port that is using that interface or stop and restart SNASw ...
https://ieoc.com/discussion/6244/mtu-change
Here's the Cisco documentation description of the difference between the 2 commands. Protocol-Specific Versions of the mtu Command. Changing the MTU value with the mtu interface configuration command can affect values for the protocol-specific versions of the command (the ip mtu command, for example). If the value specified with the ip mtu interface configuration …
https://www.reddit.com/r/networking/comments/5i3x3i/jumbo_mtu_support_cisco_catalyst_4500_cunundrum/
Dec 13, 2016 · Jumbo MTU support Cisco Catalyst 4500 cunundrum.. I've got an older Cisco Catalyst 4500 that customer wants to use for 10Gig-E attached iscsi. I've advised the customer to go a different route, unfortunately they seem to be stuck on using this switch.
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://www.experts-exchange.com/questions/23544085/Setting-MTU-on-Cisco-ISR.html
In any interface including the vlan interface the command is not accepted. The invalid input marker is at the M in MTU. I have seen articles saying that you can no longer adjust the MTU on the interfaces and must now use the adjust-mss command.
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