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  • 1.  BGP route advertisement in JUNOS

    Posted 02-11-2013 00:09

    Hello, im new in JUNOS.


    I tried to configure external BGP in simple topology [R1(as1)]-[R2(as2)]-[R3(as3)].

    The configuration is almost default.

    R1 and R3 routers have the export policy: with from proto static and direct. R2 don't have any policy - so R2 should advertise all routes from BGP process to both neighbors.


    So the Question is: Why Router 2 BGP in JUNOS doesnt advertise R1-R2 connected subnet to R3 when no import/export policy on R2 is configured.

    In CISCO R3 sees the connected R1/R2 subnet when no policy or redistribution is configured on R2.


    I hope you guys understood the question.



    is this advertise-inactive command influence ?






  • 2.  RE: BGP route advertisement in JUNOS
    Best Answer

    Posted 02-11-2013 06:02



    from R2 point of view, R1-R2 subnet is known as direct route, not BGP one. BGP route is inactive. Just check 'show route R1-R2-prefix detail' . Yesadvertise-inactive may be helpful here.


  • 3.  RE: BGP route advertisement in JUNOS

    Posted 02-11-2013 06:20


    maybe somewhere there are more differences between CISCO and JUNOS default behaviour listed like this... at some site?

  • 4.  RE: BGP route advertisement in JUNOS

    Posted 02-11-2013 06:26


    Years ago, I found out that the single best source describing the differences between JUNOS ans IOS (but not IOS-XE or IOS-XR) is the book by W.Goralski titled "Juniper and Cisco Routing: Policy and Protocols for Multivendor IP Networks"