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

As Dan said that In Catalyst 3550's, the ASICs belong to ports so you need
to borrow one. Now because it has been borrowed, it will leave underlying
port unable to be used.

Whereas in 3560's, the ASICs belong to the chassis and are allocated on as
need basis, hence not needed to do any specific allocation.

Following link is pretty helpful in understanding the operation in details.

http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008015c612.shtml

Thanks,
Raman

On Sat, Aug 8, 2009 at 8:20 AM, <Keegan.Holley_at_sungard.com> wrote:

> 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.
> >>>
> >>>
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Received on Sat Aug 08 2009 - 09:19:32 ART