Cisco 1941 Router – Troubleshooting Default Credentials

That card doesn't provide routed IP interfaces - it is a switch. You can assign IPs to specific physical interfaces of this card by assigning the port to VLAN, and then defining IPs on the VLAN interface (also called SVI - Switched Virtual Interface).

Here's list of what you can do on normal, routed interfaces and on SVIs: http://www.cisco.com/c/en/us/products/collateral/routers/1800-series-integrated-services-routers-isr/prod_white_paper0900aecd8064c9f4.html

So you need to do something like that (assuming GE0/0/0 is the first port of the switch card):

int ge0/0/0
 switchport mode access
 switchport access vlan 100
 no shut

interface vlan 100
 ip address 1.2.3.254 255.255.255.0
 no shut

The most common reason I've seen for alloc failures has been serious misconfiguration of the default route -- ip route 0.0.0.0 0.0.0.0 f0/0 will cause this because it's proxy-arp, and the ARP table will grow to an insane size.

A distant second place goes to dynamic routing protocols causing severe memory fragmentation.

We (and TAC) will need a lot more information to debug this. The first place I would suggest looking is the output of show memory failures alloc after failures are happening. (before rebooting)

Note: because memory is relatively cheap (when not bought from Cisco), I tend to load my routers with as much memory as they'll hold.