Cisco Cisco IOS Software Releases 12.2 B 發佈版本通知

With PPPoA over L2TP network architecture, a few PPP sessions may not have IP addresses 
allocated during system reboot or interface flapping. If you encounter this problem, configure ppp 
ncp timeout in the template on LNS as shown here:

It is important to note a potential negative impact on PPPoX termination scenarios:

The default is no time-out at all. Configuring ppp timeout ncp 60 tells the router if NCP cannot be 
established within 60 seconds to tear down LCP and start all over again. 

Note that you should only configure ppp timeout ncp 60 if you encounter the IP address allocation 
problem described here. Do not configure the timeout indiscriminately or to any local termination 
PPPoA/PPPoE deployment.

In most NRP-2 configurations, 256 MB DRAM is adequate for up to 6500 (PPPoE) sessions. More 
sessions require 512 MB DRAM.

The default threshold at which Cisco IOS declares a process to have run “too long” is too short for 
some Cisco IOS processes, when very large numbers of sessions are established on the NRP-2. Use 
the command scheduler max-task-time 20000 to increase the default threshold. This will avoid 
unnecessary “CPUHOG” messages.

This section describes the scalability tuning parameters that should be used for running large numbers 
of sessions on the NRP-1.