Routing

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  • 1.  no route to host

    Posted 06-21-2022 11:42
    I have the following:
    root@LS-6# run show route 172.30.40.21 table P3-2.inet.0
    
    P3-2.inet.0: 17 destinations, 17 routes (17 active, 0 holddown, 0 hidden)
    + = Active Route, - = Last Active, * = Both
    
    172.30.40.21/32    *[BGP/170] 00:21:13, localpref 100, from 172.30.5.41
                          AS path: 54591 64600 54591 64600 I, validation-state: unverified
                        > to 192.168.0.5 via ge-0/0/0.302, Push 18, Push 301056(top)
    
    [edit]
    root@LS-6# run ping 172.30.40.21 routing-instance P3-2
    PING 172.30.40.21 (172.30.40.21): 56 data bytes
    ping: sendto: No route to host
    ping: sendto: No route to host
    ^C
    --- 172.30.40.21 ping statistics ---
    2 packets transmitted, 0 packets received, 100% packet loss
    
    [edit]
    root@LS-6#
    
    root@LS-6# run show route 172.30.40.21 table P3-2.inet.0 extensive
    
    P3-2.inet.0: 17 destinations, 17 routes (17 active, 0 holddown, 0 hidden)
    172.30.40.21/32 (1 entry, 1 announced)
    TSI:
    KRT queued (deferred) add
      172.30.40.21/32 -> {indirect(-)}
    Page 0 idx 0, (group ce type External) Type 1 val 0x955b528 (adv_entry)
       Advertised metrics:
         Nexthop: Self
         AS path: [43208.365] 54591 43208.365 54591 43208.365 I
         Communities: target:43208:200 target:54591:100 target:54591:111 src-as:54591:0 rt-import:172.30.5.3:5 rt-import:172.30.5.7:6
    Path 172.30.40.21 from 172.30.5.41 Vector len 4.  Val: 0
            *BGP    Preference: 170/-101
                    Route Distinguisher: 172.30.5.7:7
                    Next hop type: Indirect
                    Address: 0x940f298
                    Next-hop reference count: 36
                    Source: 172.30.5.41
                    Next hop type: Router
                    Next hop: 192.168.0.5 via ge-0/0/0.302, selected
                    Label operation: Push 18, Push 301056(top)
                    Label TTL action: prop-ttl, prop-ttl(top)
                    Load balance label: Label 18: None; Label 301056: None;
                    Session Id: 0x0
                    Protocol next hop: 172.30.5.7
                    Label operation: Push 18
                    Label TTL action: prop-ttl
                    Load balance label: Label 18: None;
                    Indirect next hop: 0x9754000 - INH Session ID: 0x0
                    State: <Secondary Active Ext ProtectionCand>
                    Local AS: 43208.365 Peer AS: 54591
                    Age: 25:10      Metric2: 20
                    Validation State: unverified
                    Task: BGP_54591.172.30.5.41+59140
                    Announcement bits (2): 0-KRT 2-BGP_RT_Background
                    AS path: 54591 64600 54591 64600 I
                    Communities: target:43208:200 target:54591:100 target:54591:111 src-as:54591:0 rt-import:172.30.5.3:5 rt-import:172.30.5.7:6
                    Import Accepted
                    VPN Label: 18
                    Localpref: 100
                    Router ID: 172.30.5.41
                    Primary Routing Table bgp.l3vpn.0
                    Indirect next hops: 1
                            Protocol next hop: 172.30.5.7 Metric: 20
                            Label operation: Push 18
                            Label TTL action: prop-ttl
                            Load balance label: Label 18: None;
                            Indirect next hop: 0x9754000 - INH Session ID: 0x0
                            Indirect path forwarding next hops: 1
                                    Next hop type: Router
                                    Next hop: 192.168.0.5 via ge-0/0/0.302
                                    Session Id: 0x0
                            172.30.5.7/32 Originating RIB: inet.3
                              Metric: 20                      Node path count: 1
                              Forwarding nexthops: 1
                                    Nexthop: 192.168.0.5 via ge-0/0/0.302
    
    [edit]
    root@LS-6#
    ​
    What might be the cause for "No route to host" ?
    What does "KRT queued (deferred) add" mean ?

    thanks !!!


  • 2.  RE: no route to host

    Posted 06-21-2022 17:45
    I figured it out after I checked the forwarding table. The label was missing because I forgot to enable mpls on the inter-provider interface.

    thanks !!