In the Test topology i have three Compute node's and
Have a single VM instance running on each compute node.

Extra routes is configured for the Two compute node's pointing to the two VM's IP

I had initiated ping from VM-3 on CN-3 to the extra route IP and
when i bring down the tunnel interface on which traffic is getting forwarded it doesn't switch to the alternate path.

FLows and groups
================
ON CSS-3
---------
oot@Ubuntu-33:~# flows | grep table=21 | grep 120
cookie=0x8000003, duration=28377.172s, table=21, n_packets=68354, n_bytes=6698692, priority=34,ip,metadata=0x30d44/0xfffffe,nw_dst=120.0.0.0/24 actions=group:150003

root@Ubuntu-33:~# groups | grep 150003
group_id=150003,type=select,bucket=actions=resubmit(,220),set_field:fa:16:3e:6b:3c:2f->eth_dst,load:0x600->NXM_NX_REG6[],set_field:0x186a8->tun_id,bucket=actions=resubmit(,220),set_field:fa:16:3e:7f:89:d6->eth_dst,load:0x100->NXM_NX_REG6[],set_field:0x186a8->tun_id
root@Ubuntu-33:~# groupstats | grep 150003
group_id=150003,duration=66996.923s,ref_count=1,packet_count=28460,byte_count=2789080,bucket0:packet_count=28460,byte_count=2789080,bucket1:packet_count=0,byte_count=0
root@Ubuntu-33:~# groupstats | grep 150003
group_id=150003,duration=67000.832s,ref_count=1,packet_count=28464,byte_count=2789472,bucket0:packet_count=28464,byte_count=2789472,bucket1:packet_count=0,byte_count=0

ON CSS-1
---------
root@Ubuntu-239:~# flows | grep table=36
cookie=0x90186a5, duration=8802.954s, table=36, n_packets=0, n_bytes=0, priority=5,tun_id=0x186a5 actions=group:150000
cookie=0x9001389, duration=8802.954s, table=36, n_packets=1980, n_bytes=84524, priority=5,tun_id=0x404 actions=write_metadata:0x1389000000/0xfffffffff000000,goto_table:51
cookie=0x90186a8, duration=8802.954s, table=36, n_packets=63816, n_bytes=6253968, priority=5,tun_id=0x186a8 actions=group:150000

root@Ubuntu-239:~# groups | grep 150000
group_id=150000,type=all,bucket=actions=resubmit(,220),set_field:fa:16:3e:6b:3c:2f->eth_dst,load:0xa00->NXM_NX_REG6[],set_field:fa:16:3e:27:39:fd->eth_src
root@Ubuntu-239:~# groupstats | grep 150000
group_id=150000,duration=68985.638s,ref_count=5,packet_count=8497,byte_count=832706,bucket0:packet_count=8497,byte_count=832706
root@Ubuntu-239:~# groupstats | grep 150000

After bringing Down the tunnel interface

pendaylight-user@root>tep:show-state
Tunnel Name Source-DPN Destination-DPN Source-IP Destination-IP Trunk-State Transport Type
-------------------------------------------------------------------------------------------------------------------------------------
tun5f87c8077be 277180664301311 31526683982167 88.0.0.7 88.0.0.6 UP VXLAN
tun902ee6c4306 31526683982167 277180664301311 88.0.0.6 88.0.0.7 UP VXLAN
tuna03e6e78908 277180664301311 97047608610567 88.0.0.7 88.0.0.5 DOWN VXLAN
tund8026795f51 97047608610567 277180664301311 88.0.0.5 88.0.0.7 DOWN VXLAN
tuncd91997ecd5 97047608610567 31526683982167 88.0.0.5 88.0.0.6 DOWN VXLAN
tunc99e3452612 31526683982167 97047608610567 88.0.0.6 88.0.0.5 DOWN VXLAN

FLows and groups
================
ON CSS-3
---------
root@Ubuntu-33:~# flows | grep table=21 | grep 120
cookie=0x8000003, duration=28751.085s, table=21, n_packets=68728, n_bytes=6735344, priority=34,ip,metadata=0x30d44/0xfffffe,nw_dst=120.0.0.0/24 actions=group:150003

root@Ubuntu-33:~# groups | grep 150003
group_id=150003,type=select,bucket=actions=resubmit(,220),set_field:fa:16:3e:6b:3c:2f->eth_dst,load:0x600->NXM_NX_REG6[],set_field:0x186a8->tun_id,bucket=actions=resubmit(,220),set_field:fa:16:3e:7f:89:d6->eth_dst,load:0x100->NXM_NX_REG6[],set_field:0x186a8->tun_id
root@Ubuntu-33:~# groupstats | grep 150003
group_id=150003,duration=67298.664s,ref_count=1,packet_count=28762,byte_count=2818676,bucket0:packet_count=28762,byte_count=2818676,bucket1:packet_count=0,byte_count=0
root@Ubuntu-33:~#