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  • 1.  Onramp Lab Exercises: Peer active no routes

    Posted 03-20-2019 10:31

    Hi Folks,
    I've just completed the Section for Multiple WAN links, page 230 on the notes.

    However, I have a question.

    How is it possible for the peer between 1.1.1.128 and 3.3.3.128 to go active when there are no routes and it is not ARP able.

    I can only imagine its due ot the gateway configurations on the network interfaces for wan1.

    Looking forward to unconfusing my brain :D

    TIA

    Alan


    #3.2.0

    ------------------------------
    Alan Wright
    LEATHERHEAD
    +44 (0) 20 7043 6127
    ------------------------------


  • 2.  RE: Onramp Lab Exercises: Peer active no routes
    Best Answer

     
    Posted 03-20-2019 11:54
    Hello Alan,

    Good question. In this case the SVR peer is established over a routed network, so all we need to peer is to find that interfaces gateway address and ensure that the gateways respond to ARP.

    Looking at the Branch1 Router, we are sending the BFD packet towards 3.3.3.128 via 1.1.1.1:
    admin@branchoffice1.seattlesite1# show arp
    Wed 2019-03-20 15:45:56 UTC
    
    Node: branchoffice1
    
    ========== ====== ================ =================== =======
     Dev Name   VLAN   IP               Dest MAC            State
    ========== ====== ================ =================== =======
     lan1          0   192.168.64.254   52:54:00:cb:c1:3b   Valid
     mpls1         0   10.0.128.1       52:54:00:25:19:24   Valid
     wan1          0   1.1.1.1          52:54:00:88:6b:6d   Valid
    
    Completed in 0.04 seconds
    admin@branchoffice1.seattlesite1# show peers 
    Wed 2019-03-20 15:46:01 UTC
    
    ============= =============== =========== ============= ====== ======== ============= =============
     Peer          Node            Interface   Destination   Vlan   Status   Hostname      Path MTU
    ============= =============== =========== ============= ====== ======== ============= =============
     bostonsite1   branchoffice1   mpls1       10.0.128.1       0   up       unavailable   unavailable
     bostonsite1   branchoffice1   wan1        3.3.3.128        0   up       unavailable   unavailable​

    And on the datacenter side, the BFD packets are sent to 1.1.1.128 via 3.3.3.1:
    admin@datacenter1.bostonsite1# show arp
    Wed 2019-03-20 15:52:58 UTC
    
    Node: datacenter1
    
    ========== ====== ============== =================== =======
     Dev Name   VLAN   IP             Dest MAC            State
    ========== ====== ============== =================== =======
     mpls1         0   10.0.128.0     52:54:00:e5:b9:0a   Valid
     srv1          0   172.16.128.2   52:54:00:6f:45:f8   Valid
     srv2          0   172.26.128.2   52:54:00:ed:18:f4   Valid
     wan1          0   3.3.3.1        52:54:00:46:d3:99   Valid
    
    Completed in 0.03 seconds
    admin@datacenter1.bostonsite1# show peers 
    Wed 2019-03-20 15:53:01 UTC
    
    ============== ============= =========== ============= ====== ======== ============= =============
     Peer           Node          Interface   Destination   Vlan   Status   Hostname      Path MTU
    ============== ============= =========== ============= ====== ======== ============= =============
     seattlesite1   datacenter1   mpls1       10.0.128.0       0   up       unavailable   unavailable
     seattlesite1   datacenter1   wan1        1.1.1.128        0   up       unavailable   unavailable​

    Any questions let me know.

    ------------------------------
    Adam Morris
    Sales Engineer
    WA
    (206) 617-4999
    ------------------------------



  • 3.  RE: Onramp Lab Exercises: Peer active no routes

    Posted 03-20-2019 12:55

    Many thanks for the clarification Adam, i suspected as much.

    BR

    Alan



    ------------------------------
    Alan Wright
    LEATHERHEAD
    +44 (0) 20 7043 6127
    ------------------------------