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New Member

PPPoE question

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?

2 REPLIES
Silver

Re: PPPoE question

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

New Member

Re: PPPoE question

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

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