MSR810配置了GRE，如何打开路由回显？

做路由跟踪的时候，此节点显示。MSR810配置了GRE，如何打开路由回显？

interface Vlan-interface1
 ip address 192.168.0.1 255.255.254.0
 tcp mss 1280
#
interface GigabitEthernet0/0
 port link-mode route
#
interface GigabitEthernet0/1
 port link-mode route
 ip address 172.17.1.66 255.255.255.252
 ip address 172.80.65.1 255.255.255.0 sub
#
interface GigabitEthernet0/4
 port link-mode route
 ip address 172.17.1.1 255.255.255.252
#              
interface GigabitEthernet0/5
 port link-mode route
#
interface GigabitEthernet0/2
 port link-mode bridge
#
interface GigabitEthernet0/3
 port link-mode bridge
#
interface Tunnel0 mode gre
 description To Unicom-M2M-UPF840
 ip address 193.168.20.2 255.255.255.252
 source 172.17.1.66
 destination 172.21.14.48
#
interface Tunnel1 mode gre
 description To Unicom-M2M-UPF940
 ip address 193.168.21.2 255.255.255.252
 source 172.17.1.66
 destination 172.21.15.48
#
interface WLAN-Radio0/0
#              
interface Eth-channel1/0:0
 tcp mss 1280
#
 scheduler logfile size 16
#
line class console
 user-role network-admin
#
line class tty
 user-role network-operator
#
line class usb
 user-role network-admin
#
line class vty
 user-role network-operator
#
line con 0
 user-role network-admin
#
line vty 0 4
 authentication-mode scheme
 user-role level-15
 user-role network-operator
#
line vty 5 63
 authentication-mode scheme
 user-role network-operator
#
 ip route-static 10.0.0.0 8 172.17.1.2
 ip route-static 37.0.0.0 8 172.17.1.2
 ip route-static 56.0.0.0 8 172.17.1.2
 ip route-static 172.21.14.48 32 172.17.1.65
 ip route-static 172.21.15.48 32 172.17.1.65
 ip route-static 172.31.1.0 24 172.17.1.2
 ip route-static 172.32.1.0 24 172.17.1.2
 ip route-static 172.80.0.0 18 Tunnel0
 ip route-static 172.80.0.0 18 Tunnel1