Routing

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  • 1.  BGP Hidden route

    Posted 03-11-2022 05:36
    Hello All,

    Am having two routers that are having IBGP sessions from Two Route-reflectors. the two routers are picking  internal routes and installing as active except the default route.
    the 0/0 route is hidden with reason: unusable path. The 0/0 route am announcing was received from my upstream provider so it has upstream ASN path, could that be an issue since routers are in cluster ? 

    the static 0/0 route which is pointing to the same next-hop seem to be working. not sure what we missing. kindly help 

    -KE# run show route 0/0 hidden 
    0.0.0.0/0        [BGP ] 2d 20:52:08, localpref 120, from 41.79.8.1
                          AS path: 37100 I
                        > to 41.79.8.202 via ge-3/0/0.0, Push 301920
    KE# run show route 0/0 hidden extensive 
     Next hop type: Indirect
                    Address: 0x15b1a30
                    Next-hop reference count: 340
                    Source: 41.79.8.1
                    Next hop type: Router, Next hop index: 1414
                    Next hop: 41.79.8.202 via ge-3/0/0.0, selected
                    Label operation: Push 301920
                    Label TTL action: no-prop-ttl
                    Protocol next hop: 41.79.8.1
                    Indirect next hop: 17383a0 262147
                    State: <Hidden Int Ext>
                    Inactive reason: Unusable path
                    Local AS: 37305 Peer AS: 37305
                    Age: 2d 20:52:41        Metric2: 101 
                    Task: BGP_37305.41.79.8.1+60229
                    AS path: 37100 I (Originator) Cluster list:  41.79.8.1
                    AS path:  Originator ID: 41.79.8.3
                    Communities: 37305:10101 37305:37100
                    Localpref: 120
                    Router ID: 41.79.8.1
                    Indirect next hops: 1
                            Protocol next hop: 41.79.8.1 Metric: 101
                            Indirect next hop: 17383a0 262147
                            Indirect path forwarding next hops: 1
                                    Next hop type: Router
                                    Next hop: 41.79.8.202 via ge-3/0/0.0
                            41.79.8.1/32 Originating RIB: inet.3
                              Metric: 101                     Node path count: 1
                              Forwarding nexthops: 1
                                    Nexthop: 41.79.8.202 via ge-3/0/0.0​
    -KE# run show route 41.79.8.1 
    
    41.79.8.1/32       *[IS-IS/18] 17:37:12, metric 101
                        > to 41.79.8.202 via ge-3/0/0.0
                        [BGP/170] 2d 20:57:35, MED 0, localpref 599, from 41.79.8.1
                          AS path: I
                        > to 41.79.8.202 via ge-3/0/0.0, Push 301920
    
    inet.3: 6 destinations, 6 routes (6 active, 0 holddown, 0 hidden)
    + = Active Route, - = Last Active, * = Both
    
    41.79.8.1/32       *[LDP/9] 17:37:12, metric 101
                        > to 41.79.8.202 via ge-3/0/0.0, Push 301920
    
    
    KE# show routing-options static 
    route 0.0.0.0/0 {
        next-hop 41.79.8.1;
        resolve;
    }
    


  • 2.  RE: BGP Hidden route

    Posted 03-12-2022 05:59

    Hello All,

    Appreciate any help on this matter. 

    Regards, 

    lish




  • 3.  RE: BGP Hidden route

    Posted 03-12-2022 20:09
    Hi!

    Do you currently have the 0/0 static route with Preference 5 in the Routing Table?
    If so, what happens if you remove the 0/0 Static Route from the configuration? Does that allow the 0/0 BGP route to be placed in the Routing Table?
    Lastly, is there any import routing-policy in the BGP section that could be denying 0/0 BGP route from being installed in the Routing Table?

    ------------------------------
    Hector Gustavo Serrano Gutierrez
    ------------------------------



  • 4.  RE: BGP Hidden route

    Posted 03-14-2022 05:39
    Ahmed, 

    can you share the output

    show route advertising-protocol bgp x.x.x.x 
    show route received-protocol bgp x.x.x.x

    from both routers having the issue?

    also share the BGP configs and routing tables.




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    GABRIEL FLORES
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