Why does ip route advertisement from GRE tunnel take precedence over physical interface? I am trying to understand the concept. Once GRE tunnel is enabled, routing will be via the tunnel instead of the physical interface.
Router B is advertising the 166.141.185.0/24 subnet to Router A.
When tunnel is shutdown at router B: (routing via physical interface)
RouterA#sh ip route | i 166.141.185
D 166.141.185.0/24 [90/1792000] via 106.101.103.46, 00:11:41, Vlan103
When tunnel is enabled at router B: (routing via tunnel)
RouterA#sh ip route | i 166.141.185
D 166.141.185.0/24 [90/1538560] via 106.101.103.50, 00:06:34, Tunnel50
Router A
interface Vlan103
description Link to Router B
bandwidth 2000
ip address 106.101.103.45 255.255.255.252
no ip redirects
no ip unreachables
no ip proxy-arp
delay 1000
interface GigabitEthernet0/1
description Link to Router B
switchport access vlan 103
switchport mode access
Router B
interface GigabitEthernet0/1
description Link to Router A
bandwidth 2000
ip address 106.101.103.46 255.255.255.252
no ip redirects
no ip unreachables
no ip proxy-arp
delay 1000
interface GigabitEthernet0/0
description LAN Segment
ip address 166.141.185.2 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
delay 1000
router eigrp 100
distribute-list prefix lan_filter_out out Tunnel50
distribute-list prefix wan_filter_in in Tunnel50
...
ip prefix-list lan_filter_out seq 10 permit 166.141.185.0/24 le 32
