From: Antonio Soares (amsoares@netcabo.pt)
Date: Thu Aug 09 2007 - 16:54:15 ART
STP don't use Ethernet II frames. It uses 802.3 SNAP Frames.
IEEE STP uses Ethernet SNAP Frames with DSAP=SSAP=0x42 which means
LSAP=0x4242.
Cisco's PVST+ uses Ethernet SNAP Frames with DSAP=SSAP=0xAA which means
LSAP=0xAAAA.
Regards,
Antonio Soares
CCIE #18473, CCNP, CCIP
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Gregory Gombas
Sent: quinta-feira, 9 de Agosto de 2007 18:24
To: Ben
Cc: ISolveSystems; Cisco certification
Subject: Re: Ethertype for mac access-list on DocCD
Great question!
I see arp on there:
0806 - Address Resolution Protocol (for IP and CHAOS)
I don't see PVST+ on there? I thought it was 0x4242 but it appears to be
assigned to PCS Basic Block Protocol?
Also is the PVST+ ethertype different from IEEE?
On 8/9/07, Ben <bmunyao@gmail.com> wrote:
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cr/
> hbr_r/br_aph.htm
>
> HTH
> Ben
>
>
> On 8/9/07, ISolveSystems <support@isolvesystems.com> wrote:
> >
> > Experts,
> >
> > May I know if I can find a list of ethertype in DocCD?
> >
> > The question asks to permit IP only traffic. I saw that I have to
> > permit ip any any as well as ip arp and PVSTPLUS.
> >
> > It's easier if ethertype is avai. in DocCD than memorizing...
> >
> > Cheers and Behappy!
> >
> > ____________________________________________________________________
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