Hi have the following config which seems to be working fine for me... check your vlan20 interface is up
ft interface vlan 212
ip address 172.31.1.221 255.255.255.252
peer ip address 172.31.1.222 255.255.255.252
no shutdown
ft peer 1
heartbeat interval 300
heartbeat count 20
ft-interface vlan 212
ft group 2
peer 1
priority 50
peer priority 150
associate-context Admin
inservice
HQ-ACE1/Admin# sh int
vlan212 is up, administratively up
Hardware type is VLAN
MAC address is 00:23:5e:25:72:f1
Mode : routed
IP address is 172.31.1.221 netmask is 255.255.255.252
FT status is standby
Description:not set
MTU: 1500 bytes
Last cleared: never
Last Changed: Tue Sep 6 12:46:06 2011
No of transitions: 1
Alias IP address not set
Peer IP address is 172.31.1.222 Peer IP netmask is 255.255.255.252
Assigned from the Supervisor, up on Supervisor
8654909 unicast packets input, 735611030 bytes
1151150 multicast, 161 broadcast
0 input errors, 0 unknown, 0 ignored, 0 unicast RPF drops
13020418 unicast packets output, 1672055521 bytes
0 multicast, 163 broadcast
0 output errors, 0 ignored