Routing

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  • 1.  eBGP not advertise full route to IBGP?

    Posted 03-11-2021 11:00
    Hi all,

    I'm facing weird problem. Router1 received full internet route from upstream and by default it should send all that route to anther IBGP peer. But in my case it not send full route even i do command show bgp neighbor IP_IBGP  it just show around 100k route send only. I dont apply any import or export policy in ibgp group.


    Thanks and anyone know or facing this issue?


  • 2.  RE: eBGP not advertise full route to IBGP?

    Posted 03-11-2021 19:07
    Is the next hop on the internet routes reachable by iBGP routes?
    By default there is no change to next hop on iBGP peers and if the route is not a reachable one it won't be active or shared.

    Also can you confirm that the iBGP peer is operating on the same routing instance as the eBGP session so sees all those bgp routes.

    And that those routes are installed and active in the routing table.

    ------------------------------
    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
    http://puluka.com/home
    ------------------------------



  • 3.  RE: eBGP not advertise full route to IBGP?

    Posted 03-11-2021 22:00
    Hi Steve,


    Currently I have 3 IGW and both of them have IBGP together without using RR. It full mesh. Each IGW have one Upstream connected with full route given.  So after i check it look like then IGW1 not get the additional full route from IGW3 through IBGP due to not use RR setup correct?  So it means it will not advertise route that not active.

    EBGP ---> by default it will advertise to IBGP

    IBGP --> by default not will advertise to other IBGP if not use RR setup.

    Please correct me if i wrong



  • 4.  RE: eBGP not advertise full route to IBGP?

    Posted 03-12-2021 05:01
    Yes, all of these three statements are true.

    So it means it will not advertise route that not active. (both eBGP & iBGP)

    EBGP ---> by default it will advertise to IBGP

    IBGP --> by default not will advertise to other IBGP if not use RR setup.

    ------------------------------
    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
    http://puluka.com/home
    ------------------------------