[f-nsp] OSPF EXST/BDR

[Josh Galvez]

There is "ip ospf mtu-ignore", but Danger, Will Robinson!, don't use it.

https://mellowd.co.uk/ccie/?p=3361

http://blog.ipspace.net/2009/11/ip-ospf-mtu-ignore-is-dangerous-command.html


On Wed, Sep 16, 2015 at 10:20 AM, Takahiro Masuda <tmasuda at vpls.net> wrote:

> There is 'IP ospf mtu-ignore'
>
> On Sep 16, 2015, at 7:33 AM, Josh Galvez <josh at zevlag.com> wrote:
>
> Greg,
>
> Yes, you can determine the current MTU on any NetIron device by doing:
>
> IP MTU
> #show ip int e 1/6 | in mtu
>   encapsulation: ETHERNET, mtu: 1500
>
> Interface Frame Size
> #show int e 1/6 | in MTU
>   Internet address is 10.9.1.17/27, MTU 1548 bytes, encapsulation ethernet
>
> Then change that MTU by:
>
> conf t
> int e 1/6
> ip mtu DECIMAL   # (IP packet mtu size, default:1500)
> ipv6 mtu DECIMAL   # (IP packet mtu size, default:1500)
>
> Or for details on making global ip mtu and frame size changes see:
>
> Change MTU
>
> http://www.brocade.com/content/html/en/configuration-guide/netiron-05900-switchingguide/GUID-D87BD747-C4A4-4BF3-B12B-BD716A74075F.html
>
> Change MTU Global
>
> http://www.brocade.com/content/html/en/configuration-guide/netiron-05900-switchingguide/GUID-44AB8F87-B478-4468-BEFB-63C71B2E665C.html
>
> Change Frame Size
>
> http://www.brocade.com/content/html/en/configuration-guide/netiron-05900-switchingguide/GUID-A9922886-E6E2-4191-A787-BE56E22B097F.html
>
> -Josh
>
> On Wed, Sep 16, 2015 at 4:10 AM, Gregory Agerba <ga at hotmail.ch> wrote:
>
>> Hi,
>>
>> While trying to setup an OSPF session between a Brocade XMR 4000 and a
>> Brocade CES2024C, I get the following error:
>>
>> EXST/BDR
>>
>> The same configuration between a Brocade CES and a CER works fine. I am
>> guessing the problem has to do with MTU? Is there a way to force the mtu on
>> the interface of the XMR, or any specific trick to be aware of?
>>
>> Many Thanks,
>> Greg.
>>
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