cấu hình GRE tunnel, nhờ mọi ng coi hộ mình miss chỗ nào!

[stupid_boy]

R1(config)#do sh run
Building configuration...

Current configuration : 1142 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
!
!
ip cef
!
ip audit po max-events 100
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback0
ip address 172.16.1.1 255.255.255.0
no keepalive
!
interface Tunnel0
ip address 192.168.3.1 255.255.255.0
ip mtu 1400
ip ospf mtu-ignore
tunnel source 192.168.3.1
tunnel destination 192.168.3.2
tunnel path-mtu-discovery
!
interface Serial1/0
ip address 192.168.1.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
router ospf 1
log-adjacency-changes
network 172.16.1.0 0.0.0.255 area 0
network 192.168.3.0 0.0.0.255 area 0
!
ip http server
no ip http secure-server
ip classless
ip route 0.0.0.0 0.0.0.0 192.168.1.1
!
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
login
!
!
end


R3#sh run
Building configuration...

Current configuration : 1105 bytes
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R3
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
!
!
ip cef
!
ip audit po max-events 100
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Loopback0
ip address 172.16.2.1 255.255.255.0
no keepalive
!
interface Tunnel0
ip address 192.168.3.2 255.255.255.0
ip mtu 1400
ip ospf mtu-ignore
tunnel source 192.168.3.2
tunnel destination 192.168.3.1
tunnel path-mtu-discovery
!
interface Serial1/0
ip address 192.168.2.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
router ospf 1
log-adjacency-changes
network 172.16.2.0 0.0.0.255 area 0
network 192.168.3.0 0.0.0.255 area 0
!
ip http server
no ip http secure-server
ip classless
!
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
login
!
!
end



lỗi thông báo là:
R1(config)#
*Mar 1 00:02:48.519: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up
R1(config)#
*Mar 1 00:02:57.519: %TUN-5-RECURDOWN: Tunnel0 temporarily disabled due to recursive routing
*Mar 1 00:02:58.519: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to down

lỗi này tương tự trên R3

[dangquangminh]

cấu hình tunnel destination của GRE sai rồi. Phải chỉ tunnel là địa chỉ của IP đầu xa (192.168.3.2).

[them huyen]

Theo toi biet thi tunnel source ip addr phai la dia chi ip cua int serial hoac co the dung menh lenh " tunnel source serial1/0" thay vi dung dia chi ip. Tunnel destination phai la dia chi ip cua dau ben kia GRE tunnel.

[puttynux]

lỗi trên có thể là do cấu hình routing của bạn có vấn đề. Khi router cảm thấy "bối rối" về routing (recursive) nó có thể sử dụng cơ chế "bảo vệ" bằng cách shutdown interface tunnel trong một khoảng thời gian. Bạn có thể troubleshoot từng bước bằng cách tắt các dynamip routing đang chạy trên nó để test tunnel trước, sau khi tunnel ok bạn bật routing lên sau.
hy vọng có thể giúp ích cho bạn.