[c-nsp] Redundancy with OSPF

[Bruno Filipe]

Case study::

The Customer is connecting to the same ISP from two different locations for redundancy purposes. The primary connection to the ISP is the one from R1, THE MAIN IDEA is to have the traffic flowing via the connection between R1 and R2 to the ISP in case the link to ISP via R1 goes DOWN (OSPF is running between R1 and R2)....Can you guys advice taking intno account that there's ip unnumbered to FastEthernet0/0 in Multilink 1 and local network that IP address as gateway to the Internet.




      Public INTERNET
      |              |
      |              |
   ___|__         ___|__   
  |      |       |      |          
  | ISP  |       | ISP  |
  |Border|       |Border|
   ------         ------
     |               |
     |               |
     |               |
   __|__          ___|__   
  |     |        |      |          
  | ISP | \      | ISP  |
  | Core|   \  / | Core |
   -----     /\   ------
     |     /    \    |
     |   /        \  |
   __|_/_          _\|___   
  |      |        |      |          
  |  ISP |        | ISP  |
  | Aggr.|        | Aggr.|
   ------          ------
    |               | 
    |               | 
    |               |
   _|__            _|__   
  |    |          |    |
  | R1 |----------| R2 |
   ----            ----
    |               |
    |               |
    |               |


[ R1 - Customer ABC site#1 ]

interface Multilink1
 ip unnumbered FastEthernet0/0
 no cdp enable
 ppp multilink
 multilink-group 1
!
interface Multilink2
 ip address 172.16.0.246 255.255.255.252
 no cdp enable
 ppp multilink
 multilink-group 2
!
interface Serial0/0:0
 no ip address
 encapsulation ppp
 ppp multilink
 multilink-group 1
!
interface Serial0/1:0
 no ip address
 encapsulation ppp
 ppp multilink
 multilink-group 1
!
interface FastEthernet0/0
 ip address 192.168.0.129 255.255.255.224
!
ip route 0.0.0.0 0.0.0.0 Multilink1
!
router ospf 100
 log-adjacency-changes
 network 172.16.1.244 0.0.0.3 area 0


[ R2 - Customer ABC site#2 ]
interface Multilink1
 ip unnumbered FastEthernet0/0
 no cdp enable
 ppp multilink
 multilink-group 1
!
interface Multilink2
 ip address 172.16.0.245 255.255.255.252
 no cdp enable
 ppp multilink
 multilink-group 2
!
interface Serial0/0:0
 no ip address
 encapsulation ppp
 ppp multilink
 multilink-group 1
!
interface Serial0/1:0
 no ip address
 encapsulation ppp
 ppp multilink
 multilink-group 1
!
interface FastEthernet0/0
 ip address 192.168.0.1 255.255.255.224
!
router ospf 100
 log-adjacency-changes
 network 172.16.1.244 0.0.0.3 area 0
!

Regards

Bruno Filipe


 
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