Re: Ethertype location

Here is a location for 'some' of the ethertypes you might run into (CDP,
ARP from your list)...

Products::Routers::Branch Routers::3200 Series Rugged ISR::Config
Guides::3200 Series Wireless MIC Software::Protocol Filters

But it does not include all of the ones we might run into. If someone else
has a more inclusive source, I'm all ears.

regards,
Tim

On Tue, Dec 24, 2013 at 6:28 AM, Sam Bibby <sammybibs_at_gmail.com> wrote:

> Hey chaps,
>
> Here is my scenario:
>
> Looking at some tasks I often get asked things like this:
>
> Allow only the following Layer 2 protocols across VLAN 146
> o STP BPDUs (consider both ISL and 802.1q trunks)
> o CDP, VTP, and UDLD
> o ARP
>
> Now this requires me to know, or be able to locate the ethertype values.
> Being that brain capacity is currently at maximum I would rather look these
> values up:
>
> Config wise I know this is referenced via a mac access-list:
>
>
> *mac access-list extended MAC_FILTER permit any any !ETHERTYPE*
>
> In this particular scenario the values used were:
>
>
> *permit any any lsap 0x4242 0x0permit any any 0x010B 0x0permit any any
> 0x806 0x0*
>
> I had no idea where to begin to find these values, are we expected to
> memorize these !! :(
>
> So that brings me to the information I am looking to glean from you goo
> people:
>
> 1. What I am looking for is a path in the DOCS-CD where I can reference
> these should I require them. I have found a few links but nothing complete.
> Does anyone know where such a thing is?
>
> 2. Why do we always set the mask to 0x0, is there a case where this would
> be different? (I may have skimmed this part of my studies!!)
>
> \Sam
>
>
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Received on Tue Dec 24 2013 - 06:46:07 ART