[c-nsp] transparent bridging question

[Bruce Pinsky]

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Frank Cisco wrote:
> Hi Bruce,
> 
> I've implemented it, but it's still not working. When the left router
> send the packet to the right side, will the layer 2 frame changed from
> PPP to Ethernet  by cisco 1601? And how the right router know mac
> address of serial router, as If I'm not mistaken serial interface
> doesn't have mac address.
> 
> 

So, it's PPP from the customer's router to the 1601?  Makes a difference.

On the serial interface of the customer's router, you will need to add "ppp
bridge ip" to allow encap of IP as bridged and not routed traffic over the
serial link.  Basically, the customer's router needs to be a PPP
Half-bridge thinking that it is talking to one big bridged ethernet domain.

http://www.cisco.com/en/US/tech/tk713/tk507/technologies_configuration_example09186a0080093c80.shtml

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bep

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