networking-ofagent 2015.1.2

OpenStack Networking ofagent

What’s this

This is OpenStack/Networking (Neutron) “ofagent” ML2 driver and its agent.

Installation

For how to install/set up ML2 mechanism driver for OpenFlow Agent, please refer to https://github.com/osrg/ryu/wiki/OpenStack

Notes for updating from Icehouce

OVS.bridge_mappings is deprecated for ofagent. It was removed in Kilo. Please use AGENT.physical_interface_mappings instead. To mimic an existing setup with bridge_mapping, you can create a veth pair, link one side of it to the bridge, and then specify the other side in physical_interface_mappings. For example, if you have the following:

[OVS]
bridge_mappings=public:br-ex

You can do:

# ip link add int-public type veth peer name phy-public
# ip link set int-public up
# ip link set phy-public up
# ovs-vsctl add-port br-ex phy-public

and then replace the bridge_mappings with:

[AGENT]
physical_interface_mappings=public:int-public

After Icehouce, most of the functionality have been folded into a single bridge, the integration bridge. (aka. br-int) The integration bridge is the only bridge which would have an OpenFlow connection to the embedded controller in ofagent now.

• ofagent no longer uses a separate bridge for tunneling. Please remove br-tun if you have one:

  # ovs-vsctl del-br br-tun

• ofagent no longer acts as an OpenFlow controller for physical bridges. Please remove set-controller configuration from your physical bridges:

  # ovs-vsctl del-controller ${PHYSICAL_BRIDGE}

The support of ancillary bridges has been removed after Icehouce. While you can still use these bridges to provide connectivity, neutron-ofagent-agent no longer reports port state changes (up/down) for these bridges. If it is a problem for you, please consider tweaking your configuration to avoid using ancillary bridges. We recommend to use a provider network instead as the following:

• Make l3-agent external_network_bridge configuration empty:

  [DEFAULT]
  external_network_bridge=

• (Re-)create a network (and subnet) for public connectivity with a flat provider network:

  neutron net-create $PUBLIC_NETWORK -- \
    --router:external=True \
    --provider:network_type:flat \
    --provider:physical_network=$PUBLIC_PHYSICAL_NETWORK

• Associate your neutron router to the above network:

  neutron router-gateway-clear $ROUTER_ID
  neutron router-gateway-set $ROUTER_ID $PUBLIC_NETWORK

• Add the corresponding entry to bridge_mappings:

  [OVS]
  bridge_mappings=$PUBLIC_PHYSICAL_NETWORK:$PUBLIC_BRIDGE

The port naming scheme for ofagent has been changed after Icehouce. If you are using security groups, you should switch firewall_driver accordingly.

From:

[securitygroup]
firewall_driver=neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver

To:

[securitygroup]
firewall_driver=neutron.agent.linux.iptables_firewall.IptablesFirewallDriver

External Resources

Neutron/OFAgent on OpenStack wiki

https://wiki.openstack.org/wiki/Neutron/OFAgent

Ryu

OFAgent uses Ryu ofproto library to communicate with the local switch.

For general Ryu stuff, please refer to http://osrg.github.io/ryu/

Ryu is available at github git://github.com/osrg/ryu.git https://github.com/osrg/ryu

The mailing is at [e-mail] https://lists.sourceforge.net/lists/listinfo/ryu-devel

Enjoy!