[Xorp-users] two BSRs

[Pavlin Radoslavov]

Mikael Johansson <johansson500 at gmail.com> wrote:

> I am trying to configure two BSRs so that one router is BSR for some
> multicast groups and another router is BSR for different multicast
> groups.
> 
> Routers are connected like this:
> 
> A --- B --- C
> 
> Both Router B and Router C are defined as BSR candidates, Router B for
> 225.13.0.0/24 (eth1, 10.0.0.1) and Router C for 225.12.0.0/24 (eth1,
> 10.0.0.2).
> 
> I would expect to see both 10.0.0.1 and 10.0.0.2 as BSRs on Router A,
> but command "show pim bootstrap" on Router A shows only one BSR:

You need to check the following:

* Are the Bootstrap messages from C forwarded by B on the
  A-B subnet.
  For that purpose you need to use a tool like tcpdump or
  wireshark that understands the Bootstrap messages format so you
  could match the content. Note that the Bootstrap messages are
  processed hop-by-hop such that only the payload of the message is
  preserved, but the IP header is replaced (i.e., the src IP address
  won't match the BSR IP address).

* Check that the (unicast) reverse-path forwarding information in A
  points to B as the next-hop toward C.

* Check for any suspicious warning or error messages in the XORP log
  output.

Pavlin

> > show pim bootstrap
> Active zones:
> BSR             Pri LocalAddress    Pri State           Timeout SZTimeout
> 10.0.0.2          1 0.0.0.0           0 AcceptPreferred      73      1243
> Expiring zones:
> BSR             Pri LocalAddress    Pri State           Timeout SZTimeout
> Configured zones:
> BSR             Pri LocalAddress    Pri State           Timeout SZTimeout
> 
> 
> 
> ---Router A---
> 
> interfaces {
>     interface eth1 {
>         default-system-config
>     }
> }
> 
> protocols {
>   static {
>     route 10.0.0.0/24 {
>       next-hop: 11.0.0.1
>     }
>   }
> }
> 
> protocols {
>   pimsm4 {
>     interface eth1 {
>       vif eth1 {
>       }
>     }
> 
>     interface register_vif {
>       vif register_vif {
>       }
>      }
> 
>     bootstrap {
>     }
>   }
> }
> 
> protocols {
>   fib2mrib {
>   }
> }
> 
> plumbing {
>   mfea4 {
>     interface eth1 {
>       vif eth1 {
>       }
>     }
>     interface register_vif {
>       vif register_vif {
>       }
>     }
>   }
> }
> 
> 
> ---Router B---
> 
> interfaces {
>     interface eth1 {
>         default-system-config
>     }
>     interface eth2 {
>         default-system-config
>     }
> }
> 
> protocols {
>   pimsm4 {
>     interface eth1 {
>       vif eth1 {
>       }
>     }
> 
>     interface eth2 {
>       vif eth2 {
>       }
>     }
> 
>     interface register_vif {
>       vif register_vif {
>       }
>     }
> 
>     bootstrap {
>       cand-bsr {
>         scope-zone 225.13.0.0/24 {
>           cand-bsr-by-vif-name: "eth1"
>          }
>       }
>     }
>   }
> }
> 
> protocols {
>   fib2mrib {
>   }
> }
> 
> plumbing {
>     mfea4 {
>         interface eth1 {
>             vif eth1 {
>             }
>         }
>         interface eth2 {
>             vif eth2 {
>             }
>         }
>         interface register_vif {
>             vif register_vif {
>             }
>         }
>     }
> }
> 
> 
> ---Router C---
> 
> interfaces {
>     interface eth1 {
>         default-system-config
>     }
> }
> 
> protocols {
>   static {
>     route 11.0.0.0/24 {
>       next-hop: 10.0.0.1
>     }
>   }
> }
> 
> protocols {
>   pimsm4 {
>     interface eth1 {
>       vif eth1 {
>       }
>     }
> 
>     interface register_vif {
>       vif register_vif {
>       }
>     }
> 
>     bootstrap {
>       cand-bsr {
>         scope-zone 225.12.0.0/24 {
>           cand-bsr-by-vif-name: "eth1"
>         }
>       }
>     }
>   }
> }
> 
> protocols {
>   fib2mrib {
>   }
> }
> 
> plumbing {
>     mfea4 {
>         interface eth1 {
>             vif eth1 {
>             }
>         }
>         interface register_vif {
>             vif register_vif {
>             }
>         }
> 
>     }
> }
> 
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