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[Anthony <1929998@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Attempting to terminate a vxlan on the lo interface with
multiple ip addresses fails. This seems to be because only
the first ip address on the interface is used. If this address
is invalid for vxlan creation (ie. 127.0.0.1), the vxlan
interface will be created, but will not have a source ip
address, and will therefore be non-functional. By setting and
including the local argument during vxlan interface creation,
we can ensure that the intended ip address is used.

Linux version: Ubuntu 20.04.1 LTS
Neutron version: neutron-21.0.0.0rc3.dev1

Current behavior:

#No source IP address is found on the vxlan interface

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet 10.1.1.1/32 scope global lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever

# ip a show dev vxlan-62
<...>
vxlan id 62 dev lo srcport 0 0 dstport 8472 ttl 32 ageing 300 udpcsum noudp6zerocsumtx noudp6zerocsumrx

Expected behavior:

#The source IP address is configured correctly

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet 10.1.1.1/32 scope global lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever

# ip a show dev vxlan-62
<...>
vxlan id 62 local 10.1.1.1 dev lo srcport 0 0 dstport 8472 ttl 32 ageing 300 udpcsum noudp6zerocsumtx noudp6zerocsumrx

** Affects: neutron
     Importance: Undecided
     Assignee: Anthony (atimmins)
         Status: In Progress

** Changed in: neutron
     Assignee: (unassigned) => Anthony (atimmins)

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https://bugs.launchpad.net/bugs/1929998

Title:
  VXLAN interface cannot source from lo with multiple IPs

Status in neutron:
  In Progress

Bug description:
  Attempting to terminate a vxlan on the lo interface with
  multiple ip addresses fails. This seems to be because only
  the first ip address on the interface is used. If this address
  is invalid for vxlan creation (ie. 127.0.0.1), the vxlan
  interface will be created, but will not have a source ip
  address, and will therefore be non-functional. By setting and
  including the local argument during vxlan interface creation,
  we can ensure that the intended ip address is used.

  Linux version: Ubuntu 20.04.1 LTS
  Neutron version: neutron-21.0.0.0rc3.dev1

  Current behavior:

  #No source IP address is found on the vxlan interface

  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
      inet 127.0.0.1/8 scope host lo
         valid_lft forever preferred_lft forever
      inet 10.1.1.1/32 scope global lo
         valid_lft forever preferred_lft forever
      inet6 ::1/128 scope host 
         valid_lft forever preferred_lft forever

  # ip a show dev vxlan-62
  <...>
  vxlan id 62 dev lo srcport 0 0 dstport 8472 ttl 32 ageing 300 udpcsum noudp6zerocsumtx noudp6zerocsumrx

  Expected behavior:

  #The source IP address is configured correctly

  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
      inet 127.0.0.1/8 scope host lo
         valid_lft forever preferred_lft forever
      inet 10.1.1.1/32 scope global lo
         valid_lft forever preferred_lft forever
      inet6 ::1/128 scope host 
         valid_lft forever preferred_lft forever

  # ip a show dev vxlan-62
  <...>
  vxlan id 62 local 10.1.1.1 dev lo srcport 0 0 dstport 8472 ttl 32 ageing 300 udpcsum noudp6zerocsumtx noudp6zerocsumrx

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