Cisco 3925 router with an ATM E3 card that never goes down!

Hi all,
We a Cisco 3925 router with an ATM E3 card (NM-1A-T3/E3) configured as below with 1 PVC. we see that the ATM subinterface we created for the PVC never goes down! not even when the WAN link is down! The problem with this is we are tracking the line protocol of the ATM sub interface to have VRRP failover to standby router. But because of this issue only BGP goes down whenever the WAN is down & line-protocol of the Subinterface remains up, the failover never happens & site is down. We can configure VRRP to track reachability of a BGP route as workaround but I would like an explanation or troubleshooting steps to check whats the trouble with current setup?
Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.1(2)T4.1, MAINTENANCE INTERIM SOFTWARE
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2011 by Cisco Systems, Inc.
Compiled Tue 30-Aug-11 08:44 by prod_rel_team
card type e3 1
interface ATM1/0
description Link to PE
mtu 1500
bandwidth 34010
no ip address
no ip proxy-arp
logging event subif-link-status
no atm ilmi-keepalive
no atm enable-ilmi-trap
end
interface ATM1/0.101 point-to-point
description PVC to MPLS PE
mtu 1500
bandwidth 2500
ip address a.b.c.d 255.255.255.252
no ip proxy-arp
ip flow monitor FMforIP4in sampler ata1to100 input
ip flow monitor FMforIP4out sampler ata1to100 output
ip nat outside
ip virtual-reassembly in
no atm enable-ilmi-trap
snmp trap link-status
pvc 1/101
vbr-nrt 8192 8192 1
vc-hold-queue 2048
oam-pvc manage
oam retry 3 5 1
oam ais-rdi 15 3
encapsulation aal5snap
protocol ip inarp
queue-depth 5 3
service-policy out Edge_Queueing
end
Thanks a lot in advance!

Your router has some configuration on it already and it would help us give you better advice if we knew what is already in the configuration. So would you post the output of show running-config (if there is sensitive information like addresses and passwords you can mask them out.
Changing the configuration register was a good start. I have a couple questions/observations that may help you get started. I notice what appears to be the same public IP address on Gig0/0 and on multilink. Did you get that address from your ISP? If so what kind of connection do you have to the ISP?
In your description you tell us that Gig0/0 is connected to a small switch, which I assume is for the LAN of your network. But that also is the interface where the public address is configured. So I am confused whether this interface is for LAN or for connecting to the ISP. Can you clarify this?
HTH
Rick

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