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[Expired for quantum because there has been no activity for 60 days.]

** Changed in: quantum
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1092485

Title:
  subnet with a specific set of host routes cannot reach each other

Status in OpenStack Quantum (virtual network service):
  Expired

Bug description:
  quanuum version: grizzly-1-181-g391d104 folsom-3-258-g6194ab2
  os:  ubuntu12.04 
  kernel:  Linux ubuntu 3.2.0-23-generic

  subnetA 10.0.100.0/24
  subnetB 10.0.101.0/24
  router1  172.24.4.226(FIP)

  
  issue describtion:
  vms in subnetA can not connect with vms in subnetB.
  vms in subnetX can reach each other well , and vms also can touch external network through router1.
  I do not know the issue whether or not relate with kernel namespace, but i'm sure os device not work well（like /sys/class/net/qr-1e3b11e4-3b）

  steps:
  0. ## configure quantum *.conf and do some base work
  ovs-vsctl add-br br-eth0
  ovs-vsctl add-br br-int
  ovs-vsctl add-port br-eth0 eth0
  ip addr add $IP dev br-eth0
  ip addr flush eth0
  ifconfig br-eth0 up
  ifconfig br-int up

  1. ## create two subnets
  quantum net-create subnet100
  quantum subnet-create subnet100 10.0.100.0/24 --host_routes type=dict list=true destination=10.0.101/24,nexthop=10.0.100.1  ##get subneta_id
  quantum net-create subnet101
  quantum subnet-create subnet101 10.0.101.0/24 --host_routes type=dict list=true destination=10.0.100/24,nexthop=10.0.101.1  ##get subnetb_id

  2.## router interface add
  quantum router-create router1
  quantum router-interface-add router1 $subneta_id
  quantum router-interface-add router1 $subnetb_id

  3.## in vma (has ip address 10.0.100.3)
  ping 10.0.100.1 (gateway) or 10.0.101.1 ... ok
  ping 10.0.100.2 （dhcp server）... ok
  ping 10.0.101.3(vmb in subnet 10.0.101.0/24)....failed

  
  ## namespace route 
  root@ubuntu:/opt/stack/quantum# ip netns exec qrouter-df2e23fd-6fc6-4d5b-9f45-4be8ea35b311 route -n
  Kernel IP routing table
  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
  0.0.0.0         172.24.4.225    0.0.0.0         UG    0      0        0 qg-f35c2624-06
  10.0.100.0      0.0.0.0         255.255.255.0   U     0      0        0 qr-eb146672-1f
  10.0.101.0      0.0.0.0         255.255.255.0   U     0      0        0 qr-1e3b11e4-3b

  ##ovs-vsctl show
  cb3c41d8-129e-4252-af3b-9923422e8afd
      Bridge "br-eth0"
          Port "eth0"
              Interface "eth0"
          Port "phy-br-eth0"
              Interface "phy-br-eth0"
          Port "br-eth0"
              Interface "br-eth0"
                  type: internal
      Bridge br-int
          Port "qr-1e3b11e4-3b"
              tag: 3
              Interface "qr-1e3b11e4-3b"
                  type: internal
      ...
          Port "tapefb54b36-ca"
              tag: 7
              Interface "tapefb54b36-ca"
                  type: internal
          Port "qr-eb146672-1f"
              tag: 2
              Interface "qr-eb146672-1f"
                  type: internal
      ...

  
  ## ovs-dpctl show
  system@br-int:
          lookups: hit:23273 missed:30570 lost:0
          flows: 6
          port 0: br-int (internal)
          port 1: int-br-eth0
          ...
  Dec 20 16:25:04|00006|netdev_linux|WARN|/sys/class/net/qr-eb146672-1f/carrier: open failed: No such file or directory
          port 6: qr-eb146672-1f (internal)
  Dec 20 16:25:04|00007|netdev_linux|WARN|/sys/class/net/qr-1e3b11e4-3b/carrier: open failed: No such file or directory
          port 7: qr-1e3b11e4-3b (internal)
          ...
          port 18: qvoae90a2b6-93
          port 19: qvoce2db978-c4

  ## ovs-ofctl show br-int
          ...
   6(qr-eb146672-1f): addr:5d:01:00:00:00:00
       config:     PORT_DOWN
       state:      LINK_DOWN
   7(qr-1e3b11e4-3b): addr:5d:01:00:00:00:00
       config:     PORT_DOWN
       state:      LINK_DOWN
          ...

  
  ##"ovs-dpctl dump-flows br-int " show nothing in port6 & 7

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