Cisco

連接到 2 個路由器的 Cisco 交換機

  • April 10, 2013

我有以下設置:

在此處輸入圖像描述

左邊的路由器是一個棒上的路由器,用於在具有不同 VLAN 的 LAN 內路由流量。

左邊的交換機是我們 LAN 的根交換機,用作 VTP 伺服器。這也連接到路由器 6。

這是我想要做的:

我想使用這四個路由器將此 LAN 連接到未來的另一個 LAN(將以類似的方式與 Router4 和 5 連接),因為連結必須是高可用的。

但當然,交換機不能有 2 個預設網關(對嗎?),我不能給路由器提供相同範圍內的 IP 地址。我將如何最好地解決這個問題?這樣交換機就可以 ping 這些路由器中的任何一個,並且將來可以 ping 另一個 LAN 中的任何設備。

以下是正在執行的配置:

左側路由器:

Building configuration...

Current configuration : 1291 bytes
!
version 12.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Router
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
no ip address
duplex auto
speed auto
!
interface FastEthernet0/0.1
encapsulation dot1Q 1 native
ip address 192.168.1.1 255.255.255.0
!
interface FastEthernet0/0.10
encapsulation dot1Q 10
ip address 192.168.10.1 255.255.255.0
ip helper-address 192.168.2.2
!
interface FastEthernet0/0.20
encapsulation dot1Q 20
ip address 192.168.20.1 255.255.255.0
ip helper-address 192.168.2.2
!
interface FastEthernet0/0.30
encapsulation dot1Q 30
ip address 192.168.30.1 255.255.255.0
ip helper-address 192.168.2.2
!
interface FastEthernet0/0.40
encapsulation dot1Q 40
ip address 192.168.40.1 255.255.255.0
ip helper-address 192.168.2.2
!
interface FastEthernet0/0.99
encapsulation dot1Q 99
ip address 192.168.99.1 255.255.255.0
ip helper-address 192.168.2.2
!
interface FastEthernet0/1
ip address 192.168.2.1 255.255.255.0
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
router ospf 1
log-adjacency-changes
network 192.168.2.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 0
!
ip classless
!
!
!
!
!
!
!
line con 0
line vty 0 4
login
!
!
!
end

左側開關:

Building configuration...

Current configuration : 1907 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Switch
!
!
!
interface FastEthernet0/1
switchport trunk native vlan 99
switchport mode trunk
!
interface FastEthernet0/2
switchport trunk native vlan 99
switchport mode trunk
!
interface FastEthernet0/3
switchport trunk native vlan 99
switchport mode trunk
!
interface FastEthernet0/4
switchport trunk native vlan 99
switchport mode trunk
!
interface FastEthernet0/5
switchport trunk native vlan 99
switchport mode trunk
!
interface FastEthernet0/6
switchport trunk native vlan 99
switchport mode trunk
!
interface FastEthernet0/7
switchport trunk native vlan 99
switchport mode trunk
!
interface FastEthernet0/8
switchport trunk native vlan 99
switchport mode trunk
!
interface FastEthernet0/9
switchport trunk native vlan 99
switchport mode trunk
!
interface FastEthernet0/10
switchport trunk native vlan 99
switchport mode trunk
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
interface GigabitEthernet1/1
switchport trunk native vlan 99
switchport mode trunk
!
interface GigabitEthernet1/2
switchport trunk native vlan 99
switchport mode trunk
!
interface Vlan1
no ip address
shutdown
!
interface Vlan10
no ip address
!
interface Vlan20
no ip address
!
interface Vlan30
no ip address
!
interface Vlan40
no ip address
!
interface Vlan99
ip address 192.168.1.2 255.255.255.0
!
ip default-gateway 192.168.1.1
!
!
line con 0
!
line vty 0 4
login
line vty 5 15
login
!
!
end

路由器6

Building configuration...

Current configuration : 630 bytes
!
version 12.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Router
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 172.16.1.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 172.16.2.1 255.255.255.0
duplex auto
speed auto
!
interface Serial0/0/0
no ip address
!
interface Serial0/0/1
no ip address
!
interface Serial0/1/0
no ip address
!
interface Serial0/1/1
no ip address
!
interface Vlan1
no ip address
shutdown
!
ip classless
!
!
!
!
!
!
!
line con 0
line vty 0 4
login
!
!
!
end

您想查看 HSRP。基本上,路由器 5 和路由器 6 將共享 192.168.1.1,但它們的真實地址將是 .200 和 .201(例如)。

HSRP 使非路由(靜態)主機可以受益於高可用性。這是這個想法的要點,我稍後會添加更多配置。

HSRP 可能是您最好的選擇,但由於看起來您正在執行路由協議,您可以考慮通過預設路由。只需確保您有一個具有高指標(如 254)的備份預設路由作為備份或幫助網路冷啟動。

L3 3550 似乎支持的另一個選項是使用ip sla和跟踪表。我沒有在交換機上使用它,但是在分支路由器上成功使用它來在路由變得不可 ping 時切換預設路由。

ip sla 4
icmp-echo 10.10.10.2 source-interface FastEthernet0
threshold 1000
frequency 5
ip sla schedule 4 life forever start-time now
track 4 ip sla 4
delay down 5 up 3
ip route 0.0.0.0 0.0.0.0 1.1.1.1 track 4

軌跡表也可以與路由圖一起使用set ip next-hop verify-availability 1.1.1.1 250 track 4

我猜這些可能適用於 L3 3560 或 2960 或更高版本,但不能肯定地說。我仍然會投票支持通過 OSPF 傳遞預設路由 :)

引用自:https://serverfault.com/questions/342658