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Error This Interface Does Not Allow User-settable Mtu

If so, it's probably not related to MTU but something else. Rene's unrelenting effort to "out-do himself", and his dedication to the individual career growth of each member is a testament to what it takes to be a true professional and an Re: How to change interface mtu on a Fa port Aref - CCNPx2 (R&S - Security) / Network+ / Security+ May 20, 2014 3:44 AM (in response to Racharla Chandra Kanth) Which always come up, even if I am working on more complex technologies.

So why is all of this important to know? Through these online communities you can discuss your questions with thousands of your peers, hundreds of CCIE's and INE's own team of world renowned CCIE instructors and authors, Brian Dennis - Please type your message and try again. 10 Replies Latest reply: May 20, 2014 3:22 PM by Krishna How to change interface mtu on a Fa port Racharla Chandra Kanth May The size of the of the Ethernet frame will be like this: 1460 bytes of payload for TCP. 20 bytes for the TCP header. 20 bytes for the IP header. 14 https://supportforums.cisco.com/discussion/11217381/port-channel-configurations-not-onboard-router-interface

I tried removing the port-channel and re-adding > too, no luck. > > -Jason > > On 4/12/2010 3:30 PM, Jason Berenson wrote: >> Greetings, >> >> I just upgraded a NetworkLessons helps me immensely in understanding all difficult CCIE R&S topics and I'm very glad for that! I've got > a port channel and it removed the 'channel-group 1' line from the two > ethernet interfaces. Router(config-if)#mtu 9216% Interface FastEthernet0/0 does not support user settable mtu.

If its not fragmenting at 1400 and the packet size is greater than 1400 (1500 in your example) shouldnt the ip mtu command have 1500 set? Thanks, Jason _______________________________________________ cisco-nsp mailing list cisco-nsp [at] puck https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ bg at billyguthrie Apr12,2010,5:41PM Post #2 of 7 (4350 views) Permalink Re: Cisco 7200 - IOS15.1 - Port-channel [In reply Microsoft is the Devil ... [Microsoft] by NormanS562. Also, how do I determine the ideal MTU value to maximize my data throughput through my Cisco uBR7111.

Here's the relevant config: > > interface Port-channel1 > description << TO GI9/5 10/5 >> > no ip address > no ip redirects > random-detect > ! > interface Port-channel1.11 > Remove the mtu command from the port channel configuration to be able to add this interfaceto the port channel I don't have any mtu commands on any interfaces except the defaults, On top of this data we add the Ethernet header. Networklessons.com has demonstrated an exceptional creative and effective teaching method in explaining complex networking and security concepts into an easy to understand method.

Unfortunately, I haven't gigabit ports on my routers. See More 1 2 3 4 5 Overall Rating: 0 (0 ratings) Log in or register to post comments Rozsa Illes Wed, 06/15/2011 - 07:46 Hi,What is the IOS you are Thank you, Marian March 19, 2014 at 19:06 #12589 Rene MolenaarKeymaster Hi Marian, It will depend on the router, some routers can't set the "Eternet" MTU. Excellent for fast, complete and precise reviews.

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. It was a great help for designing one of our clients DMVPN network setup. Therefore the MTU defined under the show commands is 1500 which is the MTU for the Ethernet Payload, not including the Ethernet Headers.

Below is the log from ASA %ASA-4-400023: IDS:2150 ICMP fragment from 172.21.0.* to 10.124.*.* o o n interface wan3 May 21, 2015 at 16:20 #12598 Rene MolenaarKeymaster Hi Syed, Is When I try to add them back I get: router(config-if)#channel-group 1 Error: This interface does not allow user-settable mtu. There's an easy way to find out. Read my story Social Fans14,328Fans8,449Followers1,589Subscribers Highest Rated Lessons MPLS Layer 3 VPN Configuration (32 votes) Cisco Portfast Configuration (25 votes) Introduction to DMVPN (20 votes) Ethernet Introduction for CCNA R&S (16

Re: How to change interface mtu on a Fa port Krishna May 20, 2014 3:22 PM (in response to Racharla Chandra Kanth) The router which I am trying to configure in More Lessons Added Every Week! The lessons help build useful experiences so the student is prepared for most situations that will come their way. Your cache administrator is webmaster.

How do we fix this? Here's the relevant config: >> >> interface Port-channel1 >> description << TO GI9/5 10/5 >> >> no ip address >> no ip redirects >> random-detect >> ! >> interface Port-channel1.11 >> Router(config-if)#mtu 9216 % Interface FastEthernet0/0 does not support user settable mtu.

I only bring this up because of the conversation we had recently about some inconsistencies with fragmentation … and of course, the 8 bytes preamble added by the interface drivers.

I am one of the happiest members because I know I have Networklessons.com when I require any relevant information, which shows their expertise in the networking. It is not a corrupt IOS. If 1500 is the default, do I want to change this value and to what value should I change itto for optimum results? Featured Post IT, Stop Being Called Into Every Meeting Promoted by Highfive Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able

Why? Re: How to change interface mtu on a Fa port Mrigendra May 20, 2014 3:12 AM (in response to Racharla Chandra Kanth) Hi Chandu,There could be two cases:1> Either your Router's My question is shouldnt you set it to 1500 then? Sending 11, [1495..1505]-byte ICMP Echos to 192.168.12.1, timeout is 2 seconds: Packet sent with the DF bit set Reply to request 0 (1 ms) (size 1495) Reply to request 1 (4

Re: How to change interface mtu on a Fa port Aref - CCNPx2 (R&S - Security) / Network+ / Security+ May 20, 2014 2:57 AM (in response to Racharla Chandra Kanth) So it comes down to affecting all protocols, or just IP traffic. To demonstrate this problem (and how to solve it!) I will use a simple network with a reduced MTU. Comment Submit Your Comment By clicking you are agreeing to Experts Exchange's Terms of Use.

I was about to configure the FastE interface using Version 12.2(33)SRD4, so as suggested, I would open a case with TAC as it clearly appears to be a bug. Tahou Network & Security Engineer No Complexity Zone! Does that make sense? Ethernet adds another 14 bytes which is how we get to 1514 bytes in total.

I've got a port channel and it removed the 'channel-group 1' line from the two ethernet interfaces. Personal Support by Rene Molenaar (CCIE #41726)Give Membership a try - it's just $1 ►274 New Members signed up the last 30 days! 100% Satisfaction Guaranteed!You may cancel your monthly membership Here is Why: Learn any CCNA, CCNP and CCIE R&S Topic. I was about to configure the FastE interface using Version 12.2(33)SRD4, so as suggested, I would open a case with TAC as it clearly appears to be a bug.

Follow us:Terms & ConditionsPrivacy StatementCookie PolicyTrademarksLanguagesChinaJapanIndiaJive Software Version: 7.0.3.1 , revision: Custom Login | Register For Free | Help Search this list this category for: (Advanced) Mailing List Archive: Cisco: NetworkLessons.com is a great resource for me and I come here first when I have a Cisco-related task to learn. Rene May 5, 2015 at 04:57 #12593 Michael MParticipant Few questions 1. To simulate a network with a lower MTU I will reduce the MTU of the FastEthernet 0/0 interface of R2: R2(config)#interface fastEthernet 0/0 R2(config-if)#mtu 1400 By reducing the MTU to 1400

Any ideas? Tnx Arie -----Original Message----- From: cisco-nsp-bounces [at] puck [mailto:cisco-nsp-bounces [at] puck] On Behalf Of Jason Berenson Sent: Monday, April 12, 2010 22:31 To: cisco-nsp [at] puck Subject: [c-nsp] Cisco 7200 - I dont understand why we would lower it instead of increasing it.