Hi guys   I am doing a model of OTV in which it is intended to have a link bakcup such service, the topolgia is the one below is displayed, the problem is the time it takes to converge the network when you have the fall of the first link and which is approximately 1 minute, somehow know to enhance this time or it would advisable to have high availability on the issue of the link?   ------SITE 1--------- ASR1 1001 Active otv site bridge-domain 1 otv site-identifier 0000.0000.0001 multilink bundle-name authenticated spanning-tree mode rapid-pvst spanning-tree extend system-id spanning-tree uplinkfast interface Overlay1  no ip address  otv join-interface GigabitEthernet0/0/0  otv use-adjacency-server 172.23.101.2 unicast-only  otv adjacency-server unicast-only otv isis hello-interval minimal  service instance 10 ethernet   encapsulation dot1q 10   bridge-domain 10  !  service instance 11 ethernet   encapsulation dot1q 11   bridge-domain 11  ! ! interface GigabitEthernet0/0/0  description Connection LAN-TO-LAN ACTIVE  ip address 172.23.101.2 255.255.255.0  negotiation auto interface GigabitEthernet0/1/1  description Connection  switch1 3750  no ip address  negotiation auto  service instance 1 ethernet   encapsulation untagged   bridge-domain 1  !  service instance 10 ethernet   encapsulation dot1q 10   bridge-domain 10  !  service instance 11 ethernet   encapsulation dot1q 11   bridge-domain 11   SWITCH1 3750  spanning-tree mode rapid-pvst spanning-tree extend system-id spanning-tree uplinkfast spanning-tree vlan 1-22 priority 24576 interface GigabitEthernet0/1  description conexion ASR1 1001 ACTIVE  switchport trunk encapsulation dot1q  switchport mode trunk ! interface GigabitEthernet0/24  description Connection HA-SWITCH2 3750  switchport trunk encapsulation dot1q  switchport mode trunk ! SWITCH2 3750 spanning-tree mode rapid-pvst spanning-tree extend system-id spanning-tree uplinkfast spanning-tree vlan 1-22 priority 28672 interface GigabitEthernet0/1  description Connection ASR2 1001 BACKUP  switchport trunk encapsulation dot1q  switchport mode trunk interface GigabitEthernet0/24  description Connection HA-SWITCH1 3750  switchport trunk encapsulation dot1q  switchport mode trunk ASR2 1001 Backup otv site bridge-domain 1 otv site-identifier 0000.0000.0001 multilink bundle-name authenticated spanning-tree mode rapid-pvst spanning-tree extend system-id spanning-tree uplinkfast interface Overlay1  no ip address  otv join-interface GigabitEthernet0/0/0  otv use-adjacency-server 172.23.101.4 unicast-only  otv adjacency-server unicast-only otv isis hello-interval minimal  service instance 10 ethernet   encapsulation dot1q 10   bridge-domain 10  !  service instance 11 ethernet   encapsulation dot1q 11   bridge-domain 11  ! ! interface GigabitEthernet0/0/0  description Connection LAN-TO-LAN BACKUP  ip address 172.23.101.4 255.255.255.0  negotiation auto interface GigabitEthernet0/1/1  description Connection  switch2 3750  no ip address  negotiation auto  service instance 1 ethernet   encapsulation untagged   bridge-domain 1  !  service instance 10 ethernet   encapsulation dot1q 10   bridge-domain 10  !  service instance 11 ethernet   encapsulation dot1q 11   bridge-domain 11   --------SITE 2---------- ASR3 1001 Active otv site bridge-domain 1 otv site-identifier 0000.0000.0002 multilink bundle-name authenticated spanning-tree mode rapid-pvst spanning-tree extend system-id spanning-tree uplinkfast interface Overlay1  no ip address  otv join-interface GigabitEthernet0/0/0  otv use-adjacency-server 172.23.101.2 unicast-only  otv adjacency-server unicast-only otv isis hello-interval minimal  service instance 10 ethernet   encapsulation dot1q 10   bridge-domain 10  !  service instance 11 ethernet   encapsulation dot1q 11   bridge-domain 11  ! ! interface GigabitEthernet0/0/0  description Connection LAN-TO-LAN ACTIVE   ip address 172.23.101.3 255.255.255.0  negotiation auto interface GigabitEthernet0/1/1  description Connection  switch3 3750  no ip address  negotiation auto  service instance 1 ethernet   encapsulation untagged   bridge-domain 1  !  service instance 10 ethernet   encapsulation dot1q 10   bridge-domain 10  !  service instance 11 ethernet   encapsulation dot1q 11   bridge-domain 11   SWITCH3 3750  spanning-tree mode rapid-pvst spanning-tree extend system-id spanning-tree uplinkfast spanning-tree vlan 1-22 priority 24576 interface GigabitEthernet0/1  description conexion ASR3 1001 ACTIVE  switchport trunk encapsulation dot1q  switchport mode trunk ! interface GigabitEthernet0/24  description Connection HA-SWITCH4 3750  switchport trunk encapsulation dot1q  switchport mode trunk ! SWITCH4 3750 spanning-tree mode rapid-pvst spanning-tree extend system-id spanning-tree uplinkfast spanning-tree vlan 1-22 priority 28672 interface GigabitEthernet0/1  description Connection ASR4 1001 BACKUP  switchport trunk encapsulation dot1q  switchport mode trunk interface GigabitEthernet0/24  description Connection HA-SWITCH3 3750  switchport trunk encapsulation dot1q  switchport mode trunk ASR4 1001 Backup otv site bridge-domain 1 otv site-identifier 0000.0000.0002 multilink bundle-name authenticated spanning-tree mode rapid-pvst spanning-tree extend system-id spanning-tree uplinkfast interface Overlay1  no ip address  otv join-interface GigabitEthernet0/0/0  otv use-adjacency-server 172.23.101.4 unicast-only  otv adjacency-server unicast-only otv isis hello-interval minimal  service instance 10 ethernet   encapsulation dot1q 10   bridge-domain 10  !  service instance 11 ethernet   encapsulation dot1q 11   bridge-domain 11  ! ! interface GigabitEthernet0/0/0  description Connection LAN-TO-LAN BACKUP  ip address 172.23.101.5 255.255.255.0  negotiation auto interface GigabitEthernet0/1/1  description Connection  switch4 3750  no ip address  negotiation auto  service instance 1 ethernet   encapsulation untagged   bridge-domain 1  !  service instance 10 ethernet   encapsulation dot1q 10   bridge-domain 10  !  service instance 11 ethernet   encapsulation dot1q 11   bridge-domain 11       ... 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