[quagga-dev 16630] Weird route introduced when OSPF P2MP configured

Srinivas K k.sreenivaas at outlook.com
Thu Jul 6 13:27:46 BST 2017


I am seeing below strange route added to routing table.

ospfd at plant# show  ip ospf route
.........
N    12.0.0.3/32           [11] area: 0.0.0.0
                           via 12.0.0.2, eth1

Topology :
==========
Router A, B and C connected via eth1. All are quagga running routers

Router-A eth1 12.0.0.3
===================
interface eth1
 ip ospf network point-to-multipoint
!
router ospf
 router-id 12.0.0.3
 network 12.0.0.0/8 area 0
!
end


Router-B eth1 12.0.0.2
===================
interface eth1
 ip ospf network point-to-multipoint
!
router ospf
 router-id 12.0.0.2
 network 12.0.0.0/8 area 0
!
end


 Router-C 12.0.0.1
================
interface eth1
 ip ospf network point-to-multipoint
!
router ospf
 ospf router-id 12.0.0.1
 network 12.0.0.0/8 area 0.0.0.0
!
end


Output at router-C
=================

ospfd at plant# show  ip ospf route
============ OSPF network routing table ============
N    12.0.0.1/32           [0] area: 0.0.0.0
                           directly attached to eth1
N    12.0.0.2/32           [10] area: 0.0.0.0
                           via 12.0.0.2, eth1
N    12.0.0.3/32           [11] area: 0.0.0.0
                           via 12.0.0.2, eth1


ospfd at plant# show  ip ospf database router

       OSPF Router with ID (12.0.0.1)


                Router Link States (Area 0.0.0.0)

  LS age: 14
  Options: 0x2  : *|-|-|-|-|-|E|*
  LS Flags: 0x3
  Flags: 0x0
  LS Type: router-LSA
  Link State ID: 12.0.0.1
  Advertising Router: 12.0.0.1
  LS Seq Number: 8000000d
  Checksum: 0x3187
  Length: 60
   Number of Links: 3

    Link connected to: Stub Network
     (Link ID) Net: 12.0.0.1
     (Link Data) Network Mask: 255.255.255.255
      Number of TOS metrics: 0
       TOS 0 Metric: 0

    Link connected to: another Router (point-to-point)
     (Link ID) Neighboring Router ID: 12.0.0.2
     (Link Data) Router Interface address: 12.0.0.1
      Number of TOS metrics: 0
       TOS 0 Metric: 10

    Link connected to: another Router (point-to-point)
     (Link ID) Neighboring Router ID: 12.0.0.3
     (Link Data) Router Interface address: 12.0.0.1
      Number of TOS metrics: 0
       TOS 0 Metric: 10


  LS age: 23
  Options: 0x2  : *|-|-|-|-|-|E|*
  LS Flags: 0x6
  Flags: 0x0
  LS Type: router-LSA
  Link State ID: 12.0.0.2
  Advertising Router: 12.0.0.2
  LS Seq Number: 80000009
  Checksum: 0xd2f7
  Length: 60
   Number of Links: 3

    Link connected to: Stub Network
     (Link ID) Net: 12.0.0.2
     (Link Data) Network Mask: 255.255.255.255
      Number of TOS metrics: 0
       TOS 0 Metric: 0

    Link connected to: another Router (point-to-point)
     (Link ID) Neighboring Router ID: 12.0.0.1
     (Link Data) Router Interface address: 12.0.0.2
      Number of TOS metrics: 0
       TOS 0 Metric: 1

    Link connected to: another Router (point-to-point)
     (Link ID) Neighboring Router ID: 12.0.0.3
     (Link Data) Router Interface address: 12.0.0.2
      Number of TOS metrics: 0
       TOS 0 Metric: 1


  LS age: 14
  Options: 0x2  : *|-|-|-|-|-|E|*
  LS Flags: 0x6
  Flags: 0x0
  LS Type: router-LSA
  Link State ID: 12.0.0.3
  Advertising Router: 12.0.0.3
  LS Seq Number: 8000000d
  Checksum: 0xe2df
  Length: 60
   Number of Links: 3

    Link connected to: Stub Network
     (Link ID) Net: 12.0.0.3
     (Link Data) Network Mask: 255.255.255.255
      Number of TOS metrics: 0
       TOS 0 Metric: 0

    Link connected to: another Router (point-to-point)
     (Link ID) Neighboring Router ID: 12.0.0.1
     (Link Data) Router Interface address: 12.0.0.3
      Number of TOS metrics: 0
       TOS 0 Metric: 1

    Link connected to: another Router (point-to-point)
     (Link ID) Neighboring Router ID: 12.0.0.2
     (Link Data) Router Interface address: 12.0.0.3
      Number of TOS metrics: 0
       TOS 0 Metric: 1



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