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https://learningnetwork.cisco.com/thread/70875
May 20, 2014 · Can you please let me know the diff b/w mtu and ip mtu? 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
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6000-series-switches/24048-148.html
Mar 24, 2005 · Note: The MTU size of 1546 does not include the 18 bytes of the standard Ethernet header and FCS. Therefore, these switches actually support Ethernet frames up to 1564 bytes. Catalyst 2970/2960 Series. The default maximum transmission unit (MTU) size for frames received and transmitted on all interfaces on the switch is 1500 bytes.
https://community.cisco.com/t5/switching/no-able-to-set-mtu-for-jumbo-frames/td-p/1321012
% Interface GigabitEthernet2/29 does not support user settable mtu. Labels: Other Switching ... Also attached is data sheet for 4500 line cards which show which ones support jumbo frames and which don't - ... I want to show how to quickly and reliably troubleshoot a network using notepad++.If you are not using Cisco GENIE and your network is ...
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://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://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://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.cisco.com/c/en/us/support/docs/long-reach-ethernet-lre-digital-subscriber-line-xdsl/asymmetric-digital-subscriber-line-adsl/12918-router-mtu.html
Feb 26, 2008 · The reason why some pages do not fully load is that the router fragments IP packets if the PC MTU is misconfigured and a packet greater than 1492 bytes is sent to the router. This fragmentation does not occur on the return path through the universal access concentrator (UAC) (Cisco 6400 or 7200).
https://www.tek-tips.com/viewthread.cfm?qid=1676873
Mar 05, 2012 · If the packet is larger than the configured MTU, it is dropped." and "The Catalyst 4500 series switch does not compare the packet size with the MTU at the egress port, but jumbo frames are dropped in ports that do not support them." and "The MTU of a packet is not checked on the ingress side for an SVI; it is checked on the egress side of an SVI.
https://www.reddit.com/r/networking/comments/5i3x3i/jumbo_mtu_support_cisco_catalyst_4500_cunundrum/
Dec 13, 2016 · 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. Everything is fine and dandy, except for the ability to support jumbo frames. the "system mtu jumbo blah" command isn't even available.
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