From: tycampbell@comcast.net
Date: Tue Aug 31 2004 - 15:03:15 GMT-3
protected ports won't "speak" to each other
on the DOC CD
Configuring Protected Ports
Some applications require that no traffic be forwarded between ports on the same switch so that one neighbor does not see the traffic generated by another neighbor. In such an environment, the use of protected ports ensures that there is no exchange of unicast, broadcast, or multicast traffic between these ports on the switch.
Protected ports have these features:
A protected port does not forward any traffic (unicast, multicast, or broadcast) to any other port that is also a protected port. Data traffic cannot be forwarded between protected ports at Layer 2; only control traffic, such as PIM packets, is forwarded because these packets are processed by the CPU and forwarded in software. All data traffic passing between protected ports must be forwarded through a Layer 3 device.
Forwarding behavior between a protected port and a nonprotected port proceeds as usual.
Protected ports are supported on 802.1Q trunks.
The default is to have no protected ports defined.
-------------- Original message --------------
> Hi all,
> I have configured protected ports in a 3550.
>
> I have two hosts in the vlan 10 and their switch`s ports are protected.
>
> I have enabled the layer 3 in the 3550
>
> If I ping from host A to host B I cannot get a success.
>
> If I disable the protected port I can ping through the layer 2 of 3550.
>
> I don`t understand why?
>
> any suggest?
>
> Many Thanks
>
> Francesco
>
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