Re: Cisco 3550 RSPAN - reflector-port What does it do?

I actually had the same question, but its still unclear to me. Excuse me
if everyone else figured this out. So the reflector port is just a port
that surrenders it's ASIC to be used for RSPAN? If so does there need to
be one for the source and the dest or just the entire rspan operation?
Also, is it done only on the transit switches who carry only the RSPAN
VLAN? In other words if the switch has either a source port or a
destination port for the RSPAN does it automatically donate the ASIC from
that port? Lastly, is this necessary for RSPAN to work or is this just to
avoid a performance hit? The reason why I ask is because it's not in the
12.4 configuration guide fro the 3560.

Thanks all,

Keegan

Re: Cisco 3550 RSPAN - reflector-port What does it do?

Danshtr
to:
Adrian
08/08/09 07:26 AM

Sent by:
nobody_at_groupstudy.com
Cc:
Cisco certification
Please respond to Danshtr

true

Best regards,
Dan

On Sat, Aug 8, 2009 at 12:24 PM, Adrian <ccie2323_at_gmail.com> wrote:

> so the port-reflector has to be any port that is not being used?
>
> On Sat, Aug 8, 2009 at 1:15 PM, Danshtr <danshtr_at_gmail.com> wrote:
>
>> As RSPAN is done in HW, the switch needs a port ASIC (something like a
>> CPU).
>>
>> On 3560/2960/3750/4500/6500... the switch got a ASIC to do that, on
3550
>> it doensn't. On 3550 the switch is using one of the real port's ASIC to
do
>> the RSPAN job. That port will be unoperational as its ASIC is busy...
>>
>>
>> Best regards,
>> Dan
>>
>>
>>
>> On Sat, Aug 8, 2009 at 7:17 AM, Adrian <ccie2323_at_gmail.com> wrote:
>>
>>> Hi Experts,
>>> What does reflector-port do in the RSPAN configuration
for
>>> 3550? This command is not available for the newer switches that i'm
>>> familar
>>> with, could anyone tell me what is that for? thank you.
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
>>>
Received on Sat Aug 08 2009 - 09:20:31 ART