[j-nsp] weird MTU size on "show interface"

[Chris Evans]

Cisco is different.  They typically don't include layer 2 overhead on the
display/config where as juniper does...
On Oct 1, 2010 4:55 PM, "Michel de Nostredame" <d.nostra at gmail.com> wrote:
> On Fri, Oct 1, 2010 at 4:10 AM, Wojciech Owczarek
> <wojciech at owczarek.co.uk> wrote:
>> This is just the way Juniper do things, just that it's not consistent
>> across all of their platforms. I've once been told by a Juniper
>> engineer that  1514 vs. 1518 MTU value is  displayed (on the EX
>> platform at least) because the 4 bytes of CRC are not taken into
>> account as the CRC is not part of the media MTU (which kind of makes
>> sense). Excerpt from "Configure the Media MTU" in Juniper docs:
>>
>> "The actual frames transmitted also contain cyclic redundancy check
>> (CRC) bits, which are not part of the media MTU. For example, the
>> media MTU for a gigabit Ethernet interface is specified as 1500 bytes,
>> but the largest possible frame size is actually 1504 bytes; you need
>> to consider the extra bits in calculations of MTUs for
>> interoperability."
>>
>> So while not really a problem, this does cause some confusion.
>>
>> HTH,
>>
>> Cheers,
>> Wojciech
>
> Thanks Felix and Wojciech,
>
> As you mentioned that is display problem and causes some confusion. I
> checked other Cisco Catalyst switches and I found similar "display"
> problem (or feature :p ). The switch interfaces no matter access or
> trunk are displayed with MTU 1500.
>
> I assume that is common display behavior on the switch interface in
> both Cisco and Juniper.
>
> Regards,
> --
> Michel~
>
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