Routing

 View Only
last person joined: yesterday 

Ask questions and share experiences about ACX Series, CTP Series, MX Series, PTX Series, SSR Series, JRR Series, and all things routing, including portfolios and protocols.
Back to discussions
Expand all | Collapse all

iBGP Prepends its own AS when advertising AS Path within the AS

  • 1.  iBGP Prepends its own AS when advertising AS Path within the AS

    This message was posted by a user wishing to remain anonymous
    Posted 06-15-2023 07:48
    This message was posted by a user wishing to remain anonymous

    Hello All,

    MPLS setup with ISIS-SR and iBGP between all MX. No LDP or RSVP.  Our VRF learn the routes from other routers with the VRF ASN. 

    Routing is broken via IBGP, IBGP seems to prepend its own AS when its advertising them to IBGP peers

    For Example : 
    When we look into a route in I VRF AS1 is advertised. which is out local AS. This happens for all routes advertised 

    router> show route advertising-protocol bgp 10.1.1.1 1.1.1.0/24

    I.inet.0: 919184 destinations, 3676088 routes (918987 active, 0 holddown, 206 hidden)
      Prefix          Nexthop           MED     Lclpref    AS path
    * 1.1.1.0/24              Self                 2001    100        1 2914 13335 I

    Expectation is AS path 2914 13335 I

    Any idea why IBGP is prepending own AS ?