[Xorp-users] Routes redistribution between OSPF and BGP

[Yue Li]

Hi, Atanu
I have a topology like below. I run OSPF on all routers and BGP on R2,
R5, which forms a eBGP peering.

The problem is when I redistribute OSPF into BGP, I can only see the
routes to "net13" and "net34" on R5.
I wonder whether I should export "connected" to BGP, so I may see
"net12" and "net24" on R5.

              net12
         (R1)---------(R2)------------(R5)----------(R6)
 net13  |              |                  |                |
           |    AS1    | net24         |     AS2    |
         (R3)---------(R4)             (R7)-----------(R8)
                net34

The config of R2 is:
interfaces {
   interface tun0 {
       disable: false
       vif tun0 {
          disable: false
          address 10.0.0.1 {
             prefix-length: 30
                disable: false
          }
       }
   }
   interface tun1 {
       disable: false
       vif tun1 {
          disable: false
          address 10.0.0.17 {
             prefix-length: 30
                disable: false
          }
       }
   }
   interface tun2 {
       disable: false
       vif tun2 {
          disable: false
          address 10.0.0.65 {
             prefix-length: 30
                disable: false
          }
       }
   }
}
policy {
  policy-statement connected {
    term export {
        from {
             protocol: "connected"
        }
    }
 }
  policy-statement ospf-to-bgp {
    term ospf2bgp {
        from {
             protocol: "ospf4"
        }
    }
 }
}
protocols {
  ospf4 {
     router-id: 10.0.0.1
     export: "connected"
     area 0.0.0.0 {
       interface tun0 {
           link-type: "p2p"
           vif tun0 {
              address 10.0.0.1 {
                 hello-interval: 10
                 interface-cost: 100
                 neighbor 10.0.0.2 {
                     router-id: 10.0.0.2
                 }
              }
           }
        }
       interface tun1 {
           link-type: "p2p"
           vif tun1 {
              address 10.0.0.17 {
                 hello-interval: 10
                 interface-cost: 100
                 neighbor 10.0.0.18 {
                     router-id: 10.0.0.14
                 }
              }
           }
        }
     }
   }
   bgp {
      bgp-id: 10.0.0.1
      export: "ospf-to-bgp"
      local-as: 65010
      peer 10.0.0.66 {
          local-ip: 10.0.0.65
          as: 65011
          next-hop: 10.0.0.65
          ipv4-multicast: false
          ipv6-unicast: false
          ipv6-multicast: false
      }
   }
}



On Mon, Mar 24, 2008 at 12:20 PM, Atanu Ghosh <atanu at icsi.berkeley.edu> wrote:
> Hi,
>
>  All the networks that you wish to advertise to an external AS need to be
>  redistributed into BGP. You therefore need to redistribute OSPF into
>  BGP.
>
>         Atanu.
>
>  >>>>> "Yue" == Yue Li <yueli.m at gmail.com> writes:
>
>     Yue> Hi, All I have several XORP routers which form 2 Autonomous
>     Yue> Systems.  OSPFv2 is used for intra-AS protocol and BGP is
>     Yue> running on the AS border routers.
>
>     Yue> I found no BGP routes when monitoring BGP behaviors, while
>     Yue> their peering relations are correct.  And routers in different
>     Yue> AS can't ping each other.
>
>     Yue> So I guess I need to add routes redistribution to the
>     Yue> configuration of the AS border routers, right?  Do I need to
>     Yue> add ospf-to-bgp policy, or bgp-to-ospf policy, or both of them?
>
>     Yue> Any help would be greatly appreciated.
>
>     Yue> _______________________________________________ Xorp-users
>     Yue> mailing list Xorp-users at xorp.org
>     Yue> http://mailman.ICSI.Berkeley.EDU/mailman/listinfo/xorp-users
>