From: Tarun Pahuja (pahujat@gmail.com)
Date: Tue Oct 30 2007 - 10:15:30 ART
Transparent Layer 2 overwrites the customer PDU-destination MAC
address in an Ethernet packet with a well-known Cisco proprietary
multicast address (01-00-0c-cd-cd-d0). The Ethernet packet is then
transparently tunneled over the core network to a peer PE router. If
Layer 2 protocol tunneling is configured on the PE router on the
outbound side, the destination MAC address is restored in the Layer 2
protocol information so that packets are forwarded to all ports in the
same metro VLAN.
HTH,
Tarun
On 10/30/07, CCIEin2006 <ciscocciein2006@gmail.com> wrote:
> As a follow up question, if Layer 2 tunnels overwrite the destination mac
> address of frames with a proprietary mac address, how does the remote switch
> know what the original mac address was when it translates it back?
>
> On 10/29/07, CCIEin2006 <ciscocciein2006@gmail.com> wrote:
> >
> > Hey Folks,
> >
> > I am trying to how the CAM table comes into play when forwarding frames
> > using dot1q tunnels or layer 2 tunnels.
> >
> > When using dot1q tunnels, is the cam table checked and the frame is sent
> > only to the intended port or is the frame flooded to all ports in the
> > customer's vlan?
> >
> > Does the same hold true for Layer 2 Tunnels?
> >
> > Thanks in advance.
>
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