Public bug reported:
1. TROUBLE DESCRIPTION
1.1. Trouble summary
Host route with different network hop ip is getting updated and CSC is
sending it the VM for static route update
1.2. Detailed trouble description
- update neutron subnet with host route with different network next hop ip
address
- observe CSC updating the VM with the host route
- observe VM updating the same and traffic is affected
- expected : since the feature works on ELAN , different subnet next hop
ip should not be updated in the VM
logs :
stack@ubuntu:~/devstack$ neutron subnet-list
+--------------------------------------+------+------------+------------------------------------------+
| id | name | cidr | allocation_pools
|
+--------------------------------------+------+------------+------------------------------------------+
| 2fb37acf-7f2a-46f5-aff5-e6ad898d2a83 | s2 | 2.1.1.0/24 | {"start":
"2.1.1.2", "end": "2.1.1.254"} |
| 3a7d0b90-ff45-45bc-969c-f9b40e338e72 | s1 | 1.1.1.0/24 | {"start":
"1.1.1.2", "end": "1.1.1.254"} |
| 9054b9f2-5ce3-4323-a99c-885392b7f309 | s3 | 3.1.1.0/24 | {"start":
"3.1.1.2", "end": "3.1.1.254"} |
| efb27dc3-ed22-46e9-8e22-9a4ca47a9e53 | s4 | 4.1.1.0/24 | {"start":
"4.1.1.2", "end": "4.1.1.254"} |
+--------------------------------------+------+------------+------------------------------------------+
stack@ubuntu:~/devstack$
stack@ubuntu:~/devstack$ neutron subnet-update s1 --host-route
destination=3.1.1.0/24,nexthop=2.1.1.12
Updated subnet: s1
in VM:
routes are getting updated
PING 3.1.1.7 (3.1.1.7): 56 data bytes
64 bytes from 3.1.1.7: seq=0 ttl=64 time=0.433 ms
64 bytes from 3.1.1.7: seq=1 ttl=64 time=0.143 ms
--- 3.1.1.7 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.143/0.288/0.433 ms
$
$
$ sudo /sbin/cirros-dhcpc up eth0
udhcpc (v1.20.1) started
Sending discover...
Sending select for 1.1.1.13...
Lease of 1.1.1.13 obtained, lease time 86400
$
$
$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 1.1.1.1 0.0.0.0 UG 0 0 0 eth0
0.0.0.0 4.1.1.1 0.0.0.0 UG 0 0 0 eth3
0.0.0.0 3.1.1.1 0.0.0.0 UG 0 0 0 eth2
0.0.0.0 2.1.1.1 0.0.0.0 UG 0 0 0 eth1
1.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
2.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
3.1.1.0 2.1.1.12 255.255.255.0 UG 0 0 0 eth1
3.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2
4.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth3
$ ping 3.1.1.7
PING 3.1.1.7 (3.1.1.7): 56 data bytes
--- 3.1.1.7 ping statistics ---
2 packets transmitted, 0 packets received, 100% packet loss
$
$
in CSC: routes are processed and send as an dhcp update
2017-09-15 11:16:03,333 | INFO | pool-28-thread-1 | DhcpPktHandler
| 360 - org.opendaylight.netvirt.dhcpservice-impl - 0.3.4.SNAPSHOT | XXXX
checking hostRoute HostRoutes{getDestination=IpPrefix [_ipv4Prefix=Ipv4Prefix
[_value=3.1.1.0/24]], getNexthop=IpAddress [_ipv4Address=Ipv4Address
[_value=2.1.1.12]], augmentations={}}
2017-09-15 11:16:03,333 | INFO | pool-28-thread-1 | DhcpPktHandler
| 360 - org.opendaylight.netvirt.dhcpservice-impl - 0.3.4.SNAPSHOT | XXXX
hostRoute next hop 2.1.1.12
2017-09-15 11:16:03,333 | INFO | pool-28-thread-1 | DhcpPktHandler
| 360 - org.opendaylight.netvirt.dhcpservice-impl - 0.3.4.SNAPSHOT | XXXX
finally going to set subnetHostRoutes [HostRoutes{getDestination=IpPrefix
[_ipv4Prefix=Ipv4Prefix [_value=3.1.1.0/24]], getNexthop=IpAddress
[_ipv4Address=Ipv4Address [_value=2.1.1.12]], augmentations={}}]
1.3. Frequency of fault
reproducible
1.4. Workaround and Recovery
configure next hop in the same network
** Affects: neutron
Importance: Undecided
Status: New
** Tags: host route
** Tags added: host route
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https://bugs.launchpad.net/bugs/1719240
Title:
Host route with different network hop ip is getting updated and CSC is
sending it the VM for static route update
Status in neutron:
New
Bug description:
1. TROUBLE DESCRIPTION
1.1. Trouble summary
Host route with different network hop ip is getting updated and CSC is
sending it the VM for static route update
1.2. Detailed trouble description
- update neutron subnet with host route with different network next hop
ip address
- observe CSC updating the VM with the host route
- observe VM updating the same and traffic is affected
- expected : since the feature works on ELAN , different subnet next hop
ip should not be updated in the VM
logs :
stack@ubuntu:~/devstack$ neutron subnet-list
+--------------------------------------+------+------------+------------------------------------------+
| id | name | cidr | allocation_pools
|
+--------------------------------------+------+------------+------------------------------------------+
| 2fb37acf-7f2a-46f5-aff5-e6ad898d2a83 | s2 | 2.1.1.0/24 | {"start":
"2.1.1.2", "end": "2.1.1.254"} |
| 3a7d0b90-ff45-45bc-969c-f9b40e338e72 | s1 | 1.1.1.0/24 | {"start":
"1.1.1.2", "end": "1.1.1.254"} |
| 9054b9f2-5ce3-4323-a99c-885392b7f309 | s3 | 3.1.1.0/24 | {"start":
"3.1.1.2", "end": "3.1.1.254"} |
| efb27dc3-ed22-46e9-8e22-9a4ca47a9e53 | s4 | 4.1.1.0/24 | {"start":
"4.1.1.2", "end": "4.1.1.254"} |
+--------------------------------------+------+------------+------------------------------------------+
stack@ubuntu:~/devstack$
stack@ubuntu:~/devstack$ neutron subnet-update s1 --host-route
destination=3.1.1.0/24,nexthop=2.1.1.12
Updated subnet: s1
in VM:
routes are getting updated
PING 3.1.1.7 (3.1.1.7): 56 data bytes
64 bytes from 3.1.1.7: seq=0 ttl=64 time=0.433 ms
64 bytes from 3.1.1.7: seq=1 ttl=64 time=0.143 ms
--- 3.1.1.7 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.143/0.288/0.433 ms
$
$
$ sudo /sbin/cirros-dhcpc up eth0
udhcpc (v1.20.1) started
Sending discover...
Sending select for 1.1.1.13...
Lease of 1.1.1.13 obtained, lease time 86400
$
$
$ route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 1.1.1.1 0.0.0.0 UG 0 0 0 eth0
0.0.0.0 4.1.1.1 0.0.0.0 UG 0 0 0 eth3
0.0.0.0 3.1.1.1 0.0.0.0 UG 0 0 0 eth2
0.0.0.0 2.1.1.1 0.0.0.0 UG 0 0 0 eth1
1.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
2.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
3.1.1.0 2.1.1.12 255.255.255.0 UG 0 0 0 eth1
3.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2
4.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth3
$ ping 3.1.1.7
PING 3.1.1.7 (3.1.1.7): 56 data bytes
--- 3.1.1.7 ping statistics ---
2 packets transmitted, 0 packets received, 100% packet loss
$
$
in CSC: routes are processed and send as an dhcp update
2017-09-15 11:16:03,333 | INFO | pool-28-thread-1 | DhcpPktHandler
| 360 - org.opendaylight.netvirt.dhcpservice-impl - 0.3.4.SNAPSHOT |
XXXX checking hostRoute HostRoutes{getDestination=IpPrefix
[_ipv4Prefix=Ipv4Prefix [_value=3.1.1.0/24]], getNexthop=IpAddress
[_ipv4Address=Ipv4Address [_value=2.1.1.12]], augmentations={}}
2017-09-15 11:16:03,333 | INFO | pool-28-thread-1 | DhcpPktHandler
| 360 - org.opendaylight.netvirt.dhcpservice-impl - 0.3.4.SNAPSHOT |
XXXX hostRoute next hop 2.1.1.12
2017-09-15 11:16:03,333 | INFO | pool-28-thread-1 | DhcpPktHandler
| 360 - org.opendaylight.netvirt.dhcpservice-impl - 0.3.4.SNAPSHOT |
XXXX finally going to set subnetHostRoutes [HostRoutes{getDestination=IpPrefix
[_ipv4Prefix=Ipv4Prefix [_value=3.1.1.0/24]], getNexthop=IpAddress
[_ipv4Address=Ipv4Address [_value=2.1.1.12]], augmentations={}}]
1.3. Frequency of fault
reproducible
1.4. Workaround and Recovery
configure next hop in the same network
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