We have 2 sites connected together with Cisco 3620's containing NM-8T1-IMA modules at each end. Both ends have the same hardware and IOS version 12.1. Currently 2 T-1's are connecting the 2 locations in one IMA group. Two more T-1's were recently installed by the telco.
When I connected the 3rd T1 into the NM-8T1-IMA and issued "no shut" on atm0/2, the interface came up (interface up, line protocol down), but the atm0/ima0 stopped sending data (i.e. could not ping 192.168.1.246) even though the ima group was up,up. The interface atm0/2 was not brought into the ima0 group.
I suspect there is an issue with my ATM config or an IOS bug. Any insights would be greatly appreciated. Configs at both ends are similar to the following:
version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname xxx
!
logging buffered 4096 debugging
logging rate-limit 10000
enable secret 5 xxx
!
ip subnet-zero
!
!
no ip finger
no ip domain-lookup
!
call rsvp-sync
cns event-service server
!
!
!
!
!
!
!
!
interface ATM0/0
no ip address
atm vc-per-vp 256
no atm ilmi-keepalive
ima-group 0
clock source internal
no scrambling-payload
!
interface ATM0/1
no ip address
atm vc-per-vp 256
no atm ilmi-keepalive
ima-group 0
clock source internal
no scrambling-payload
!
interface ATM0/2
no ip address
shutdown
atm vc-per-vp 256
no atm ilmi-keepalive
no scrambling-payload
!
interface ATM0/3
no ip address
shutdown
atm vc-per-vp 256
no atm ilmi-keepalive
no scrambling-payload
!
interface ATM0/4
no ip address
shutdown
atm vc-per-vp 256
no atm ilmi-keepalive
no scrambling-payload
!
interface ATM0/5
no ip address
shutdown
atm vc-per-vp 256
no atm ilmi-keepalive
no scrambling-payload
!
interface ATM0/6
no ip address
shutdown
atm vc-per-vp 256
no atm ilmi-keepalive
no scrambling-payload
!
interface ATM0/7
no ip address
shutdown
atm vc-per-vp 256
no atm ilmi-keepalive
no scrambling-payload
!
interface ATM0/IMA0
ip address 192.168.1.245 255.255.255.252
load-interval 30
atm vc-per-vp 256
no atm ilmi-keepalive
pvc 1/1
protocol ip 192.168.1.246 broadcast
vbr-nrt 3000 3000 600
encapsulation aal5snap
!
!
interface FastEthernet1/0
ip address 192.168.1.242 255.255.255.252
duplex auto
speed auto
!
ip kerberos source-interface any
ip classless
ip route 0.0.0.0 0.0.0.0 192.168.1.246
ip route 192.168.1.232 255.255.255.248 192.168.1.241
ip route 192.168.1.244 255.255.255.252 ATM0/IMA0 permanent
ip route 192.168.1.248 255.255.255.252 192.168.1.246
no ip http server
!
logging trap debugging
!
!
dial-peer cor custom
!
!
!
!
line con 0
exec-timeout 0 0
password 7 xxx
login
transport input none
line aux 0
line vty 0 4
password 7 xxx
login
!
end
