From: CCIE 19999 (ccie@iprimus.com.au)
Date: Thu Aug 09 2007 - 17:47:19 ART
I have read this from one of the forums:
To find the frame types, run a debug of spanning tree and the frame type can
be located in there, See below:
CAT1#debug spanning-tree all
19:23:45: STP: VLAN0060 rx BPDU: config protocol = ieee, packet from
FastEthernet0/14 , linktype SSTP , enctype 3, encsize 22
19:23:45: STP: enc 01 00 0C CC CC CD 00 0B FD AF 99 8E 00 32 AA AA 03 00 00
0C 01 0B
19:23:45: STP: Data
0000000000803C000BFDAF998000000000803C000BFDAF9980800E0000140002000F00
19:23:45: STP: VLAN0060 Fa0/14:0000 00 00 00 803C000BFDAF9980 00000000
803C000BFDAF9980 800E 0000 1400 0200 0F00
19:23:45: STP(60) port Fa0/14 supersedes 0
19:23:45: STP: opt: VLAN0060: get ports: chunk 0 allocated
19:23:45: STP: opt: VLAN0060: freeing opt chunk 0
19:23:45: STP SW: PROC RX: 0100.0ccc.cccd<-000b.fdaf.998e type/len 0032
19:23:45: encap SNAP linktype sstp vlan 700 len 64 on v700 Fa0/14
19:23:45: AA AA 03 00000C 010B SSTP
19:23:45: CFG P:0000 V:00 T:00 F:00 R:82BC 000b.fdaf.9980 00000000
19:23:45: B:82BC 000b.fdaf.9980 80.0E A:0000 M:1400 H:0200 F:0F00
19:23:45: T:0000 L:0002 D:02BC
Look for the encapsulation, it says SNAP..... AA AA
By the way, I believe you must have memorized the frame type for SNAP, LSAP
and ARP already :)
HTH,
Shine
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Antonio Soares
Sent: Friday, 10 August 2007 5:54 AM
To: 'Gregory Gombas'; 'Ben'
Cc: 'ISolveSystems'; 'Cisco certification'
Subject: RE: Ethertype for mac access-list on DocCD
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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