Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

Navigation
Guide That Contains This Content
[+] Expand All
[-] Collapse All

    BGP Report

    When the client session is opened for the first time, the BGP Report should be checked to make sure that the network has no obvious BGP configuration errors.

    The output file that is written to the output directory is called “BGPRPT.runcode”.


    BGP Integrity Check Report:


    BGP statistics – This section shows:

    • The total number of BGP speakers in the network
    • The total number of neighbors
    • The total number of policies
    • The list of all ASs and the number of their BGP speakers
      ******************************************************
      * BGP Integrity Check Report
      ******************************************************
      -- 17 BGP speakers,89 neighbors,283 members,183 policies
      -- 3 local AS:
      ASno 222: 9 routers
      ASno 111: 7 routers
      ASno 555: 1 routers

    Neighbor AS Specification Error Check Report


    This section shows any errors about ASs that are not specified correctly. For example, router A declares that its neighbor, router B, is in AS1243, but router B is actually in AS4312.

    * * * * *
    Neighbor AS Specification Error Check Report
    AS Location Nbr_AS Nbr_IP_Addr Nbr-Location ValidAS Comments
    111 X39 224 69.49.226.34 Q39 222
    *** 1 AS specification errors

    In the example above, the Neighbor AS Specification Error Check Report shows that there is an error in the node (Location) X39. The neighbor node(Nbr-Location) is Q39 and the neighbor AS (Nbr_AS) is 224, which should be 222 as shown in the ValidAS field.


    Unbalanced BGP Neighbor Check Report


    The BGP protocol requires that if router A declares router B to be its neighbor, then router B also has to declare that router A is its neighbor. If not, then an unbalanced neighbor occurs. This section reports any unbalanced neighbors between BGP speakers within the network.
    * * * * *
    Unbalanced BGP Neighbor Check Report

    # Unbalanced BGP Neighbor = 2
    AS   Location Nbr_AS  Nbr-Location
    111    S39       111     X39
    111    W39       111     X39

    The Unbalanced BGP Neighbor Check Report shows that there are two unbalanced neighbors. On the first record S39 declares that X39 is its neighbor but X39 does not declare that S39 is its neighbor. The second record shows a similar error.


    IBGP Mesh Connectivity Check Report


    All IBGP speakers within an AS have to be fully meshed, unless route reflectors or confederation are used. This section shows if any AS is not fully meshed. A full mesh for both IPV4 and VPNV4 address families are checked.

    * * * * *
    IBGP Mesh Connectivity Check Report
    AS222: #IPV4 IBGP neighbor=0. Check mesh definition for VPNV4 address family
    AS 222: passed mesh connectivity checking
    ---- VPNV4 AS111: S39 is not defined as X39's neighbor
    IPV4 VPNV4 AS111: W39 is not defined as X39's neighbor
    AS111: 2 neighbor definition missing
    AS333: IPV4, VPNV4, L2VPN IBGP neighbors are not defined
    AS 555: passed mesh connectivity checking

    The IBGP Mesh Connectivity Check Report above shows the following

    • AS222 is fully meshed for the VPNV4 address family but no IBGP neighbors exist for IPV4 address family.
    • AS111 is not fully meshed for IPV4 and VPNV4. For the VPNV4 address family, S39 and W39 are not defined as X39’s neighbors. For the IPV4 address family, W39 is not defined as X39’s neighbor.
    • AS555 passes the mesh connectivity check for both IPV4 and VPNV4.
    • AS333 is missing IBGP neighbors for the IPV4, VPNV4, and L2VPN address families.

    IPV4/VPNV4/L2VPN Route Reflector Statistics


    These three sections indicate the route reflector statistics, including number of route reflectors, number of route reflector clients, and hierarchical route reflector information. Route reflector clients with only one route reflector are listed as a warning that they do not have redundant route reflectors defined. The following is an example of the IPV4 route reflector statistics:
    IPV4 Route Reflector Statistics: 200 BGP Speakers, 8 Route Reflectors, 100 Route
    Reflector Clients
    Redundant Route Reflectors are not defined at 2 RR Clients
    1. WDC1, RR= PHI1
    2. WDC2, RR= PHI1

    #Route Reflector Hierarchy Level= 3
       Top Level: 4RR(s)
          1. NYC1,
          2. NYC2,
          3. BOS1,
       4. BOS2,
    Level 2: 3RR(s)
          1. PHI1, RR= NYC1 NYC2
          1. PHI2, RR= NYC1 NYC2
          2. BOS3, RR= BOS1 BOS2
    Level 3: 1RR(s)
          1. TRE1, RR= PHI1 PHI2

    VPNV4 and L2VPN route reflector statistics are similarly provided.

    It is recommended that all errors reported in the BGP Report file get fixed before carrying on further analysis. One way to do it is to correct the errors on the configuration files and then run through getipconf again.

    Modified: 2016-11-08