Cisco Cisco IOS Software Release 12.2(4)B

This document describes the PPPoE Session Limit feature in Cisco IOS Release 12.2(4)B. It includes 
the following sections:

The PPP over Ethernet (PPPoE) Session Limit feature enables you to limit the number of PPPoE sessions 
that can be created on a router or on an ATM permanent virtual connection (PVC), PVC range, virtual 
circuit (VC) class, or Ethernet subinterface.

Before the introduction of this feature, there was no way to limit the number of PPPoE sessions that 
could be created on a router. Not having a limit was potentially a problem because it was possible that 
the router could create so many PPPoE sessions that it would run out of memory. 

To prevent the router from using too much memory for virtual access, the PPPoE Session Limit feature 
introduces a new command and a modification to an existing command that enable you to specify the 
maximum number of PPPoE sessions that can be created. The new pppoe limit max-sessions command 
limits the number of PPPoE sessions that can be created on the router. The modified pppoe max-sessions 
command limits the number of PPPoE sessions that can be created on an ATM PVC, PVC range, VC 
class, or Ethernet subinterface.

12.2(1)DX

This feature was introduced.

12.2(2)DD

This feature was integrated into Cisco IOS Release 12.2(2)DD.

12.2(4)B

This feature was integrated into Cisco IOS Release 12.2(4)B.