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Pim and interface type: Point to Point or Multiaccess

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  • 1.  Pim and interface type: Point to Point or Multiaccess

    Posted 10-08-2018 13:06

    Hi everyone,

    Let say we have OSPF  interface  type point to point  for ge-0/0/0, and we enable  pim,  does pim consider ge-0/0/0 as ptp  or multiaccess interface? in other words,  does pim drive interface type such as  ptp or multiaccess based on IGP ?

     

    Thanks and have a day.



  • 2.  RE: Pim and interface type: Point to Point or Multiaccess
    Best Answer

     
    Posted 10-08-2018 21:35

    Hi,

     

    You should issue "show pim interface" to know whether interface you configured PIM onto is considered as P2P or not.

     

    For instance:

     

    r1# run show pim interfaces

    Stat = Status, V = Version, NbrCnt = Neighbor Count,
    S = Sparse, D = Dense, B = Bidirectional,
    DR = Designated Router, DDR = Dual DR, DistDR = Distributed DR,
    P2P = Point-to-point link, P2MP = Point-to-Multipoint,
    Active = Bidirectional is active, NotCap = Not Bidirectional Capable

    Name               Stat Mode IP V State        NbrCnt JoinCnt(sg/*g) DR address
    ge-1/0/0.102       Up   S     4 2 DR,NotCap         0 0/0            x.x.x.x
    ge-1/0/0.200       Up   S     4 2 DR,NotCap         0 0/0            x.x.x.x
    ge-1/0/0.201       Up   S     4 2 DR,NotCap         0 0/0            x.x.x.x
    ge-1/0/1.1         Up   S     4 2 DR,NotCap         0 0/0            x.x.x.x
    ge-1/0/1.21        Up   S     4 2 DR,NotCap         0 0/0            x.x.x.x
    gr-1/0/0.1         Up   S     4 2 P2P,NotCap        0 0/0
    lo0.1              Up   S     4 2 DR,NotCap         0 0/0            x.x.x.x
    pd-1/0/0.360449    Up   S     4 2 P2P,NotCap        0 0/0
    ge-1/0/0.102       Up   S     6 2 DR,NotCap         0 0/0            fe80::f21c:2d00:66c9:xxx
    ge-1/0/0.200       Up   S     6 2 DR,NotCap         0 0/0            fe80::f21c:2d00:c8c9:xxx
    ge-1/0/0.201       Up   S     6 2 DR,NotCap         0 0/0            fe80::f21c:2d00:c9c9:xxx
    ge-1/0/1.1         Up   S     6 2 DR,NotCap         0 0/0            fe80::f21c:2d00:1c9:xxx
    ge-1/0/1.21        Up   S     6 2 DR,NotCap         0 0/0            fe80::f21c:2d00:15c9:xxx
    lo0.1              Up   S     6 2 DR,NotCap         0 0/0            fe80::f21c:2d0f:fcc9:xxx

     

     

    Also, p2p link logically means there is only one router on the other end.

     

    r1# run show pim interfaces | match p2p
    P2P = Point-to-point link, P2MP = Point-to-Multipoint,
    gr-1/0/0.1         Up   S     4 2 P2P,NotCap        0 0/0
    pd-1/0/0.360449    Up   S     4 2 P2P,NotCap        0 0/0

     

    Means no DR on p2p. You configure DR on p2p if required by configuring  "dr-election-on-p2p"

    and When a point-to-point link interface is elected to be the DR, the interface state becomes DR instead of P2P.

     

    [edit routing-instances PIM.master protocols pim]
    user@host# set dr-election-on-p2p

     

    View the following doc for more info:

    https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/multicast-config-pim-dr-p2p.html