Last week I updated an 851 router with the latest IOS image and noticed some errors after reloading the router. The upgrade was from system image file c850-advsecurityk9-mz.124-4.T8.bin to c850-advsecurityk9-mz.124-15.T3.bin. The 4.T8 image was out of the box. On reload with the new image, the router console displayed the following:
no ip dhcp use vrf connected
^
% Invalid input detected at '^' marker.
Warning: View-list ezvpn-internal-viewlist does not currently exist - configuring anyway
Configuration failed!
Looks like the ip dhcp use vrf command is no longer an option in the 15.T3 image:
cisco851(config)#ip dhcp use ? <-- 4.T8 image
class Configure use of DHCP classes
vrf Ignore or use receiving interface VRF
cisco851(config)#ip dhcp use ? <-- 15.T3 image
class Configure use of DHCP classes
However, as soon as I created a DHCP pool using the 15.T3 image the "no ip dhcp use vrf connected" command was automatically added to the config. And that is the command that errors out on a 15.T3 reload. Regarding the view list error, Im assuming it is a result of no currently active vpn tunnels, but i dont know for sure. The related commands are as follows:
cisco851W(config)#ip dns ? <-- 4.T8 image
primary Configure primary DNS server
server Enable DNS server
spoofing Configure DNS spoofing
cisco851(config)#ip dns <-- 15.T3 image
name-list Regular expression name-list
primary Configure primary DNS server
server Enable DNS server
spoofing Configure DNS spoofing
view Configure a DNS view
view-list Configure a DNS view-list
This doc from Cisco helped to shed some light on the commands and their function:
http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/htspldns.html#wp1049435
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