Re: LLDP encoding

[sothy shan <sothy.e98 () gmail com>]

On Tue, Jun 13, 2017 at 10:46 AM, Anders Broman <anders.broman () ericsson com>
wrote:

> *From:* Wireshark-users [mailto:wireshark-users-bounces () wireshark org] *On
> Behalf Of *sothy shan
> *Sent:* den 13 juni 2017 10:03
> *To:* Community support list for Wireshark <wireshark-users () wireshark org>
> *Subject:* Re: [Wireshark-users] LLDP encoding
>
>
>
>
>
>
>
> On Tue, Jun 13, 2017 at 8:41 AM, Jaap Keuter <jaap.keuter () xs4all nl>
> wrote:
>
> On 13-06-17 08:28, sothy shan wrote:
> > Hi,
> > I am just checking LLDP in mininet with OVS using wireshark.
> > My question some data are encoding differently. I wish to know why it is?
> > For example, chaissisId type is 1. But it is shown as 02 in your image.
> >
> > https://wiki.wireshark.org/LinkLayerDiscoveryProtocol?
> action=AttachFile&do=view&target=LLDP.png
> > Same thing I observed in my testing also. do you have any specific
> encodign
> > technique for LLDP data.
> >
> > Thanks for your explanation.
> >
> > Best regards
> > Sothy
>
> Hi,
>
> Be aware that the TLV type field is a subfield of this 16 bit field. it's
> only
> the seven most significant bits that constitute the subfield in question.
> Therefore the value of the subfield is '1', while the representation of
> the 16
> bit field it comes from shows '0x0207'
>
> Thanks,
> Jaap
>
>
>
> Thanks. I got it. One question is regarding portID. POrtID subtype is 7.
> It means locally assigned port id. In my case local port id is 1. it is
> encoded as  31. why? thanks again
>
> Sothy
>
>
>
> Sound like the ASCII character 0x31 = “1”
>
>
>
> Regards
>
> Anders

Thanks Andres.

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