網路架構問題

架構圖如下

分公司拉兩條專線到總公司分別為1M & 100M

分公司access internet時須透過總公司fw才可上網

在架構不變動的情況下
有什麼方式可以做到平常線路路徑走100M 當100M斷線時在走1M線路 (不能在斷線下才使用人力調整)
也就是不使用static route & default route方式解決
目前知道的方式是兩台設備跑ospf解決不知道是否還有其他方式可以建議呢??

2011-08-29 21:45 #1

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網路架構問題

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需求是Branch Router上網須要透過 HQ Router帶出去
嘗試做LAB時，小弟遇到了一些問題
172.16.12.0/24 & 172.16.13.0/24 上internet時的確有走Bandwidth較大的路徑
可是Brach Router本機直接tracerroute Internet時因為在Router上設定了兩筆Default Route造成了load balance
請問我這樣的設定正確嗎??
Branch Router可不設定兩筆Default Route也可以讓172.16.12.0/24 & 172.16.13.0/24上Internet時走cost最低路徑嗎?

HQ Router設定
HQ#sh run
Building configuration...
#省略部分輸出設定
!
interface FastEthernet0/0
ip address 1.1.1.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 172.16.3.254 255.255.255.0
duplex auto
speed auto
!
interface Ethernet1/0
ip address 172.16.100.254 255.255.255.0
ip ospf cost 50
duplex auto
speed auto
!
interface Ethernet1/1
ip address 172.16.200.254 255.255.255.0
ip ospf cost 200
duplex auto
speed auto
!
interface Ethernet1/2
ip address 172.16.2.254 255.255.255.0
duplex auto
speed auto
!
router ospf 1
log-adjacency-changes
network 172.16.100.0 0.0.0.255 area 0
network 172.16.200.0 0.0.0.255 area 0
network 172.16.2.0 0.0.0.255 area 0
network 172.16.3.0 0.0.0.255 area 0
network 1.1.1.0 0.0.0.255 area 0
!
ip classless
ip route 0.0.0.0 0.0.0.0 Public IP

HQ Router Routing Table
C 172.16.2.0 is directly connected, Ethernet1/2
C 172.16.3.0 is directly connected, FastEthernet0/1
O 172.16.12.0 [110/51] via 172.16.100.1, 00:39:17, Ethernet1/0
O 172.16.13.0 [110/51] via 172.16.100.1, 00:39:17, Ethernet1/0
C 172.16.100.0 is directly connected, Ethernet1/0
C 172.16.200.0 is directly connected, Ethernet1/1
C 1.1.1.0/24 is directly connected, FastEthernet0/0
S* 0.0.0.0/0 [1/0] via 1.1.1.254

Branch Router設定
#省略部分輸出設定
Branch#sh run
Building configuration...
!
interface FastEthernet0/0
ip address 172.16.12.254 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 172.16.13.254 255.255.255.0
duplex auto
speed auto
!
interface Ethernet1/0
ip address 172.16.100.1 255.255.255.0
ip ospf cost 50
duplex auto
speed auto
!
interface Ethernet1/1
ip address 172.16.200.1 255.255.255.0
ip ospf cost 200
duplex auto
speed auto
!
interface Ethernet1/2
no ip address
duplex auto
speed auto
shutdown
!
router ospf 3
log-adjacency-changes
network 172.16.100.0 0.0.0.255 area 0
network 172.16.200.0 0.0.0.255 area 0
network 172.16.12.0 0.0.0.255 area 0
network 172.16.13.0 0.0.0.255 area 0
default-information originate
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.16.100.254 20
ip route 0.0.0.0 0.0.0.0 172.16.200.254 20

Branch Router Routing Table
O 172.16.2.0 [110/60] via 172.16.100.254, 00:44:29, Ethernet1/0
O 172.16.3.0 [110/51] via 172.16.100.254, 00:44:29, Ethernet1/0
C 172.16.12.0 is directly connected, FastEthernet0/0
C 172.16.13.0 is directly connected, FastEthernet0/1
C 172.16.100.0 is directly connected, Ethernet1/0
C 172.16.200.0 is directly connected, Ethernet1/1
O 1.1.1.0/24 [110/51] via 172.16.100.254, 00:44:29, Ethernet1/0
S* 0.0.0.0/0 [20/0] via 172.16.200.254
[20/0] via 172.16.100.254