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difference between RRO (recored route object ) and RSVP-hop

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  • 1.  difference between RRO (recored route object ) and RSVP-hop

    Posted 04-07-2019 16:53

     could please explain in detials the differnece between RRO and RSVP-hop , and why i used RRO while RSVP-hop indicates the previous ip address which help reservation message to act on 



  • 2.  RE: difference between RRO (recored route object ) and RSVP-hop

    Posted 04-07-2019 19:31

    The RRO provides End-to-End Path visibility. The RRO keeps track of the actual path an LSP is traversing. Every node adds to the RRO the address of the interface on which PATH message has been received. This helps to detect possible routing/forwarding loops.
    i.e, If a node receives a PATH message with one of its local addresses in the RRO, it sends back PathErr message indicating Routing Loop detected.

     



  • 3.  RE: difference between RRO (recored route object ) and RSVP-hop

    Posted 04-08-2019 14:43

    thanks for your replay , but same role of rsvp-hop object indicate the previous hop ip i can use it to detect if there is any loop in the path message why i used both of them ? 



  • 4.  RE: difference between RRO (recored route object ) and RSVP-hop
    Best Answer

    Posted 04-09-2019 01:36

    RSVP hop captures only one ip address which is the address of the outgoing interface of the previous hop, each hop re-writes this address with its outgoing interface ip and hence will not have end-to-end visbility like RRO. Capture screen shot from an egress LER (R7) is given below for your reference:

    Topology:  (1.1.1.1)R1------R2--------R3--------R4--------R5--------R6---------R7 (7.7.7.7)

     

     

    RSVP-RRO-PATH-MESSAGE.png