Routing

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  • 1.  Traffic-engineering of BGP routes over different LSPs

    Posted 09-23-2014 03:32

    Hello,

     

    A theoretical question - If I have a BGP peering sessions between the lo0.0 IPs of two routers and I also have two RSVP LSPs between the same lo0.0 IPs, would it be possible to influence traffic to some of the recieved prefixies (ipv4 or vpnv4) to follow just one of the LSPs and not the other? Or to set them as primary/backup ?

     

    Thanks,

     



  • 2.  RE: Traffic-engineering of BGP routes over different LSPs
    Best Answer

    Posted 09-23-2014 06:09

    Hi,

     

    Yes it is possible.

    When multiple equal-cost LSPs to a destination exist, you can use a policy to control which LSP is actually installed in the forwarding table.

     

    A possible template for such a configuration:

     

    routing-options {
      forwarding-table {
        export lsp-policy;
      }
    }
    policy-options {
      policy-statement lsp-policy {
        term p1 {
          from community p1;
          then {
            install-nexthop lsp LSP_1;
            accept;
          }
        }
        term p2 {
          from community p2;
          then {
            install-nexthop lsp LSP_2;
            accept;
          }
        }
        term last {
          then accept;
        } } }

     

     

     

     

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  • 3.  RE: Traffic-engineering of BGP routes over different LSPs

    Posted 09-25-2014 01:37

    It works. Thank you so much !