Sometimes, parts of router configuration get lost during the reload process: although the configuration commands are saved in NVRAM, they are not processed after the reload and thus do not appear in the running configuration. Re-entering these commands manually solves the problem ... but it's obviously not a reliable solution.

Embedded Event Manager (EEM) solves this issue as well. You just configure an applet that triggers on syslog message SYS-5-RESTART and reapplies the necessary configuration commands. For example, to fix the bug CSCsf32390, Cisco recomments the following applet:

event manager applet add-buffer
 event syslog occurs 1 pattern "%SYS-5-RESTART: System restarted"
action 1.0 cli command "enable"
action 2.0 cli command "configure terminal"
action 3.0 cli command "buffers particle-clone 16384"
action 4.0 cli command "buffers header 4096"
action 5.0 cli command "buffers fastswitching 8192"
action 6.0 syslog msg "Reinstated buffers command"