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[Miguel Lavalle <miguel@xxxxxxxxxxxx>]

Public bug reported:

This error takes place with Neutron master branch. To reproduce, specify
a value for 'dstport' in the agent's configuration file in the [vxlan]
section, for example 4789, which is the the IANA defined standard value
for the UDP port used for VXLAN communication. When re-starting the
agent with this option, the following traceback ensues:
http://paste.openstack.org/show/719412/.

This happens because the value of the 'dstport' option is converted to a
string here
https://github.com/openstack/neutron/blob/master/neutron/agent/linux/ip_lib.py#L262,
before being passed as argument 'vxlan_port' to the pyroute2 library to
create a VXLAN tunnel. The value passed to pyroute2 in 'vxlan_port' must
be an integer.

After changing the code and restarting the agent, we can see that it is
listening in the specified port (4789 in my example) in 'dstport':

$ netstat -vaun
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
udp        0      0 0.0.0.0:4789            0.0.0.0:*

** Affects: neutron
     Importance: Medium
     Assignee: Miguel Lavalle (minsel)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => Miguel Lavalle (minsel)

** Changed in: neutron
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1764867

Title:
  Linuxbridge agent crashes when specifying cfg.CONF.VXLAN.udp_dstport
  option

Status in neutron:
  New

Bug description:
  This error takes place with Neutron master branch. To reproduce,
  specify a value for 'dstport' in the agent's configuration file in the
  [vxlan] section, for example 4789, which is the the IANA defined
  standard value for the UDP port used for VXLAN communication. When re-
  starting the agent with this option, the following traceback ensues:
  http://paste.openstack.org/show/719412/.

  This happens because the value of the 'dstport' option is converted to
  a string here
  https://github.com/openstack/neutron/blob/master/neutron/agent/linux/ip_lib.py#L262,
  before being passed as argument 'vxlan_port' to the pyroute2 library
  to create a VXLAN tunnel. The value passed to pyroute2 in 'vxlan_port'
  must be an integer.

  After changing the code and restarting the agent, we can see that it
  is listening in the specified port (4789 in my example) in 'dstport':

  $ netstat -vaun
  Active Internet connections (servers and established)
  Proto Recv-Q Send-Q Local Address           Foreign Address         State      
  udp        0      0 0.0.0.0:4789            0.0.0.0:*

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