CSS11501 - Unable to Telnet to VRRP backup interface IP

Hi,
I have 2 units of Cisco CSS11501 which configured running on VRRP active/standby on 2 different VLAN (Circuit). When unit 1 is master unit, I am able to telnet to its circuit IP address, but unable to telnet to any circuit IP of backup unit.
Active unit configuration:
!************************** CIRCUIT **************************
circuit VLAN145
ip address 172.19.145.182 255.255.255.0
    ip virtual-router 1 priority 101
    ip redundant-vip 1 172.19.145.184
    ip redundant-interface 1 172.19.145.183
circuit VLAN550
ip address 192.168.50.18 255.255.255.0
    ip virtual-router 2 priority 101
    ip redundant-vip 2 192.168.50.20
    ip redundant-interface 2 192.168.50.19
!*************************** OWNER ***************************
owner ***
content ***
    vip address 172.19.145.184
    port 80
    protocol tcp
    add service ***
    active
!*************************** GROUP ***************************
group ***
vip address 192.168.50.20
active
Backup unit configuration:
!************************** CIRCUIT **************************
circuit VLAN145
ip address 172.19.145.183 255.255.255.0
    ip virtual-router 1 priority 90
    ip redundant-interface 1 172.19.145.182
    ip redundant-vip 1 172.19.145.184
circuit VLAN550
ip address 192.168.50.19 255.255.255.0
    ip virtual-router 2 priority 90
    ip redundant-vip 2 192.168.50.20
    ip redundant-interface 2 192.168.50.18
!*************************** OWNER ***************************
owner ***
content ***
    vip address 172.19.145.184
    port 80
    protocol tcp
    add service ***
    active
!*************************** GROUP ***************************
group ***
vip address 192.168.50.20
active
Please help!!
Regards,
Danny Lim

Hi Marko,
That means I could not to configure redundant-interface as I have redundant-vip configured already?
Actually the topology is:
VLAN550 is connecting to server farm
VLAN145 is where user sitting
my current config :
circuit VLAN145
ip address 172.19.145.182 255.255.255.0
    ip virtual-router 1 priority 101
    ip redundant-vip 1 172.19.145.184
    ip redundant-interface 1 172.19.145.183
    ip critical-service 1 PING_DEFAULT_GATEWAY
circuit VLAN550
ip address 192.168.50.18 255.255.255.0
    ip virtual-router 2 priority 101
    ip redundant-vip 2 192.168.50.20
    ip redundant-interface 2 192.168.50.19
    ip critical-service 2 PING_DEFAULT_GATEWAY
!*************************** OWNER ***************************
owner HLRLDAP
content VIP_LDAP_16611
    vip address 172.19.145.184
    port 16611
    protocol tcp
    add service KPG-HV30-3
    add service KPG-HV30-6
    active
!*************************** GROUP ***************************
group Redundant_Server
vip address 192.168.50.20
active
So, I should have change my config like this:
CSS1
circuit VLAN145
ip address 172.19.145.182 255.255.255.0
    ip virtual-router 1 priority 101
    ip redundant-vip 1 172.19.145.184
    ip redundant-interface 1 172.19.145.181
    ip critical-service 1 PING_DEFAULT_GATEWAY
circuit VLAN550
ip address 192.168.50.18 255.255.255.0
    ip virtual-router 2 priority 101
    ip redundant-interface 2 192.168.50.20
    ip critical-service 2 PING_DEFAULT_GATEWAY
CSS2
!************************** CIRCUIT **************************
circuit VLAN145
ip address 172.19.145.183 255.255.255.0
    ip virtual-router 1 priority 90
    ip redundant-interface 1 172.19.145.181
    ip redundant-vip 1 172.19.145.184
    ip critical-service 1 PING_DEFAULT_GATEWAY
circuit VLAN550
ip address 192.168.50.19 255.255.255.0
    ip virtual-router 2 priority 90
    ip redundant-interface 2 192.168.50.20
    ip critical-service 2 PING_DEFAULT_GATEWAY

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