Cisco Switching/Routing :: 7600 Static Route ECMP Failover?

I have run into a problem testing static route failovers using ECMP.  I have an edge device (SUT) that has 2 NIC interfaces to an internal Loopback.  Each NIC is a unique Gi port on an 7609 VLAN tagged with unique IP subnets.  The 7600 is configured to route the loopback via the 2 NIC.  I am using CEF in the network for other traffic performance testing.  Using an external sniffer we can verify that when a ping is initiated externall to the SUT loopback a specific path is selected by the router. 
 
Ping host ------Network-----7609 Gi1/21 (172.16.110.9)-----------SUT Nic1 (172.16.110.10)
                                        |                             |
                                        |                             -------Loopback 137.168.68.114/32
                                        |                             |
                            7609 Gi2/21 (172.16.110.73)------------SUT Nic2 (172.16.110.74)

[code]....

Now, when the selected path is taken out of server (pulling cable for example), the 7609 is not clearing the routing table to indicate that particular path is down and failing over to the secondary path.  Other things I have noticed is the show ip cef still shows both peers as well as the arp table but the interface shows down (show interface gi1/21 for example).  I am running 15.1.  My understanding is that since the ports are directly connected to the router, the ports should be detected as down and any association of the IP for the down port should removed.  This should trigger the static route to update the static route for the end destination to use the second path and traffic should continue. 
 
ROM: System Bootstrap, Version 12.2(17r)S2, RELEASE SOFTWARE (fc1)BOOTLDR: Cisco IOS Software, c7600s72033_rp Software (c7600s72033_rp-ADVENTERPRISEK9-M), Version 15.1(1)S1, RELEASE SOFTWARE (fc1)