From: Hobbs (deadheadblues@gmail.com)
Date: Wed Aug 06 2008 - 13:47:56 ART
Jonathan, it is a question. I am not looking for a command to make it work.
it is working. please read the entire email. If my question doesn't make
sense, I can try and rephrase.
On Wed, Aug 6, 2008 at 10:42 AM, Jonathan Greenwood II <gwood83@gmail.com>wrote:
> Just turn off cdp on that particular port on CAT1 connecting to BB1. "no
> cdp enable"
>
>
> On Wed, Aug 6, 2008 at 11:37 AM, Hobbs <deadheadblues@gmail.com> wrote:
>
>> Thank you for the reply, but I am not having any configuration issues. It
>> is only a question. I don't want CAT1 to see BB1 as a neighbor, I am just
>> trying to understand why it doesn't.
>>
>> I am not doing dot1q tunneling
>>
>>
>> On Wed, Aug 6, 2008 at 10:32 AM, Jonathan Greenwood II <gwood83@gmail.com
>> > wrote:
>>
>>> You need to change the switchport mode from access to dot1q-tunnel.
>>>
>>> On Wed, Aug 6, 2008 at 11:27 AM, Hobbs <deadheadblues@gmail.com>wrote:
>>>
>>>> Hello,
>>>>
>>>> I am trying get my head around a semi-complex protocol tunneling task,
>>>> but I
>>>> have some questions on the basics.
>>>>
>>>> Here's the topology
>>>>
>>>> "Near end host": BB1
>>>> "Far end switch": CAT2
>>>>
>>>> [BB1]f0/1-----f0/11[CAT1]f0/23-----dot1q
>>>> trunk-----f0/23[CAT2]f0/1-----f0/1[R1]
>>>>
>>>> To get cdp tunneling to work (and it does work) I enable this on CAT1
>>>> and
>>>> CAT2 access ports:
>>>>
>>>> CAT1:
>>>> interface f0/11
>>>> switchport mode access
>>>> switchport access vlan 100
>>>> l2protocol-tunneling cdp
>>>> no cdp enable
>>>>
>>>> CAT2:
>>>> interface f0/1
>>>> switchport mode access
>>>> switchport access vlan 100
>>>> l2protocol-tunneling cdp
>>>> no cdp enable
>>>>
>>>> The trunk between CAT1 and CAT2 carries vlan 100 as well as others.
>>>>
>>>> This is what I understand so far:
>>>>
>>>> BB1 sends a multicast CDP packet on it's port to CAT1.
>>>> Since CAT1 has cdp tunneling enabled, it forwards it rather than
>>>> processes
>>>> it. Is this correct?
>>>> CAT1 sends this packet out all trunk links that have vlan 100 allowed
>>>> AND
>>>> any access ports on VLAN100. Is this correct?
>>>> The packet still has the cisco CDP destination MAC. Is this correct?
>>>> The packet is dot1q tagged and sent out port fa0/23 and still has cisco
>>>> CDP
>>>> destination MAC address. Is this correct?
>>>>
>>>> Question:
>>>>
>>>> CAT2 doesn't have tunneling on port fa0/23.
>>>> Why doesn't CAT2 now process this CDP packet and show BB1 has a CDP
>>>> neighbor
>>>> on fa0/23?
>>>> Does trunking override this behavior?
>>>> Does CAT2 treat this packet differently because it is a tagged CDP
>>>> packet?
>>>>
>>>> Thanks,
>>>>
>>>>
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>>>>
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