New Cisco ISR4000 Series Routers

I got the chance to install a new Cisco ISR 4431 today, and the best surprise (besides the hugely upgraded throughput) is that the onboard router interfaces now support LACP! Before, you had to resort to getting a switch HWIC module, or just using "mode on" channel-groups.  Since the 4431 has four gig interfaces, you can use LACP for two WAN interfaces, and use LACP for two LAN interfaces using the interface command channel-group 1 mode active (use any channel group number you need), and then configure the port-channel interface.

Example:

interface GigabitEthernet0/0/0
 no ip address
 media-type rj45
 negotiation auto
 channel-group 1 mode active
!
interface GigabitEthernet0/0/1
 no ip address
 media-type rj45
 negotiation auto
 channel-group 1 mode active
!
interface Port-channel1
 ip address 10.0.0.1 255.255.255.0
 no ip redirects
 no ip proxy-arp
 load-interval 30
 no negotiation auto

Show commands:
show lacp internal
show lacp neighbor