Cisco Cisco IOS Software Release 12.2(27)SBC

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The PPP-Max-Payload and IWF PPPoE Tag Support feature enables the PPP over Ethernet (PPPoE) 
component to process the PPP-Max-Payload and Interworking Functionality (IWF) PPPoE tags in the 
PPPoE discovery frame: 

The tag ppp-max-payload command allows PPPoE peers to negotiate PPP maximum receive units 
(MRUs) greater than 1492 octets if the underlying network supports a maximum transmission unit 
(MTU) size greater than 1500 octets. 

The IWF PPPoE tag allows the Broadband Remote Access Server (BRAS) to distinguish the IWF 
PPPoE from the regular PPPoE sessions to overcome the per-MAC session limit put on the BRAS 
as a protection from denial of service (DOS) attacks sourced from the same MAC address. 

Your Cisco IOS software release may not support all of the features documented in this module. To reach 
links to specific feature documentation in this module and to see a list of the releases in which each feature is 
supported, use the 

.

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