OSPF双点双规与双归属实验

OSPF双点双规与双归属实验

当左边黑色叉线路断裂，R5访问R1会出现两条负载均衡;但是不希望占用办公路由到办公的带宽;所以最佳选择就是增加R1~R2之间的开销。这样使得生产走生产路由。

当生产与生产之间的链路断裂，不希望因为私网内部的断裂导致公网R5到生产路由的带宽闲置，理由：私网内部带宽相对较大，而公网带宽资源十分珍贵。所以还是希望生产通过生产路由到达R5。R5去往R1（R2）直接使用静态指向生产（办公）路由，

R5去R1或R2

ip route-static 10.1.1.0 255.255.255.0 10.1.35.1 preference 5
ip route-static 10.2.2.0 255.255.255.0 10.1.45.1 preference 5

但是从R1（R2）到达R5使用静态路由指向时，会出现一个问题：当链路R3和R5之间出现故障因为ospf和静态相互指向，从而导致出现环路。所以需要检测下行链路是否运行正常；当下行链路故障时，则静态路由失效。根据需求采用bfd策略。

######################R3#################################
#
bfd 2 bind peer-ip 10.1.45.2 source-ip 10.1.34.1
 discriminator local 3
 discriminator remote 4
 commit
#
ip route-static 10.2.3.0 255.255.255.0 10.1.34.2 preference 5 track bfd-session 
2
#

#########################R4####################
#
bfd 1 bind peer-ip 10.1.35.2 source-ip 10.1.34.2
 discriminator local 1
 discriminator remote 2
 commit
#
ip route-static 10.1.3.0 255.255.255.0 10.1.34.1 preference 5 track bfd-session 
1
#
######################R5########################
#
bfd 1 bind peer-ip 10.1.34.2 source-ip 10.1.35.2
 discriminator local 2
 discriminator remote 1
 commit
#
bfd 2 bind peer-ip 10.1.34.1 source-ip 10.1.45.2
 discriminator local 4
 discriminator remote 3
 commit
#

测试：

增加冗余
使用VRF虚拟路由转发实例技术
R1

#
ip -instance BG
 ipv4-family
  route-distinguisher 2:2
#
ip -instance SC
 ipv4-family
  route-distinguisher 1:1
#
interface GigabitEthernet0/0/0.1
 dot1q termination vid 1
 ip binding -instance SC
 ip address 10.1.12.1 255.255.255.0 
 arp broadcast enable
#
interface GigabitEthernet0/0/0.2
 dot1q termination vid 2
 ip binding -instance BG
 ip address 10.1.112.1 255.255.255.0 
 arp broadcast enable
#
#
ospf 1 router-id 1.1.1.1 -instance SC
 area 0.0.0.0 
  network 10.1.1.0 0.0.0.255 
  network 10.1.12.0 0.0.0.255 
  network 10.1.13.0 0.0.0.255 
#
ospf 2 router-id 11.11.11.11 -instance BG
 area 0.0.0.0 
  network 10.1.14.0 0.0.0.255 
  network 10.1.112.0 0.0.0.255 
  network 10.2.1.1 0.0.0.0 
#

R2

#
ip -instance BG
 ipv4-family
  route-distinguisher 2:2
#
ip -instance SC
 ipv4-family
  route-distinguisher 1:1
#
#
interface GigabitEthernet0/0/0.1
 dot1q termination vid 1
 ip binding -instance SC
 ip address 10.1.12.2 255.255.255.0 
 arp broadcast enable
#
interface GigabitEthernet0/0/0.2
 dot1q termination vid 2
 ip binding -instance BG
 ip address 10.1.112.2 255.255.255.0 
 arp broadcast enable
#
#
ospf 1 router-id 2.2.2.2 -instance SC
 area 0.0.0.0 
  network 10.1.2.0 0.0.0.255 
  network 10.1.12.0 0.0.0.255 
  network 10.1.23.0 0.0.0.255 
#
ospf 2 router-id 22.22.22.22 -instance BG
 area 0.0.0.0 
  network 10.1.24.0 0.0.0.255 
  network 10.1.112.0 0.0.0.255 
  network 10.2.2.0 0.0.0.255 
#

测试：