PPPoE question

[chatasos]

On CCO http://www.cisco.com/warp/customer/794/pppoe_arch.html

Under Disadvantages:

* Because PPPoE implementation uses RFC1483 bridging, it is susceptible to broadcast storms and possible denial-of-service attacks.

In what way does PPPoE use RFC1483 bridging? What does it mean by broadcast storms?

[donewald]

PPPoE (or really PPPoA) uses 1483 (From the CPE) to encapsulate the PPPoE session within ATM. Since this (PPPoE) is layer 2 broadcasts will be past from CPE to PE and could cause problems. Normally Layer 3 devices can offter broadcast delmiters where BCAST traffic is compartmentalized. I think this comment was made due to the fact that L2 Bcasts would be past to the PE (Provider Equip).

Hope this helps you,

Don

[chatasos]

What are L2 broadcasts? Can you give me a clear example?