os_ken.services.protocols.bgp.application

This module provides a convenient application for using OSKen BGPSpeaker and for writing your BGP application.

It reads a configuration file which includes settings for neighbors, routes and some others. Please refer to os_ken/services/protocols/bgp/bgp_sample_conf.py for the sample configuration.

Usage Example:

$ osken-manager os_ken/services/protocols/bgp/application.py \
    --bgp-app-config-file os_ken/services/protocols/bgp/bgp_sample_conf.py

SSH Console

You can also use the SSH console and see the RIB and do some operations from this console. The SSH port and username/password can be configured by the configuration file. You can check the help by hitting '?' key in this interface.

Example:

$ ssh localhost -p 4990

Hello, this is OSKen BGP speaker (version 4.19).

bgpd> # Hit '?' key
 clear - allows to reset BGP connections
 help - show this help
 quit - exit this session
 set - set runtime settings
 show - shows runtime state information
bgpd>
bgpd> show rib all
Status codes: * valid, > best
Origin codes: i - IGP, e - EGP, ? - incomplete
     Network        Labels   Next Hop   Reason      Metric LocPrf Path
 *>  10.10.1.0/24   None     0.0.0.0    Only Path                 i
bgpd>

Integration with Other Applications

os_ken.services.protocols.bgp.application.OSKenBGPSpeaker will notifies the following events to other OSKen applications.

• EventBestPathChanged

• EventAdjRibInChanged

• EventPeerDown

• EventPeerUp

To catch these events, specify @set_ev_cls() decorator to the event handlers in the OSKen applications.

Example Application:

# my_bgp_app.py

from os_ken.base import app_manager
from os_ken.controller.handler import set_ev_cls
from os_ken.services.protocols.bgp import application as bgp_application


class MyBGPApp(app_manager.OSKenApp):
    _CONTEXTS = {
        'os_kenbgpspeaker': bgp_application.OSKenBGPSpeaker,
    }

    def __init__(self, *args, **kwargs):
        super(MyBGPApp, self).__init__(*args, **kwargs)

        # Stores "os_ken.services.protocols.bgp.application.OSKenBGPSpeaker"
        # instance in order to call the APIs of
        # "os_ken.services.protocols.bgp.bgpspeaker.BGPSpeaker" via
        # "self.app.speaker".
        # Please note at this time, "BGPSpeaker" is NOT instantiated yet.
        self.app = kwargs['os_kenbgpspeaker']

    @set_ev_cls(bgp_application.EventBestPathChanged)
    def _best_patch_changed_handler(self, ev):
        self.logger.info(
            'Best path changed: is_withdraw=%s, path=%s',
            ev.is_withdraw, ev.path)

Usage Example:

$ osken-manager my_bgp_app.py \
    --bgp-app-config-file os_ken/services/protocols/bgp/bgp_sample_conf.py

Note

For the APIs for os_ken.services.protocols.bgp.bgpspeaker.BGPSpeaker, please refer to BGP speaker library API Reference.

API Reference

exception os_ken.services.protocols.bgp.application.ApplicationException(desc=None)

Specific Base exception related to BSPSpeaker.

class os_ken.services.protocols.bgp.application.EventAdjRibInChanged(path, is_withdraw, peer_ip, peer_as)

Event called when any adj-RIB-in path is changed due to UPDATE messages or remote peer's down.

This event is the wrapper for adj_rib_in_change_handler of bgpspeaker.BGPSpeaker.

path attribute contains an instance of info_base.base.Path subclasses.

If is_withdraw attribute is True, path attribute has the information of the withdraw route.

peer_ip is the peer's IP address who sent this path.

peer_as is the peer's AS number who sent this path.

class os_ken.services.protocols.bgp.application.EventBestPathChanged(path, is_withdraw)

Event called when any best remote path is changed due to UPDATE messages or remote peer's down.

This event is the wrapper for best_path_change_handler of bgpspeaker.BGPSpeaker.

path attribute contains an instance of info_base.base.Path subclasses.

If is_withdraw attribute is True, path attribute has the information of the withdraw route.

class os_ken.services.protocols.bgp.application.EventPeerDown(remote_ip, remote_as)

Event called when the session to the remote peer goes down.

This event is the wrapper for peer_down_handler of bgpspeaker.BGPSpeaker.

remote_ip attribute is the IP address of the remote peer.

remote_as attribute is the AS number of the remote peer.

class os_ken.services.protocols.bgp.application.EventPeerUp(remote_ip, remote_as)

Event called when the session to the remote peer goes up.

This event is the wrapper for peer_up_handler of bgpspeaker.BGPSpeaker.

remote_ip attribute is the IP address of the remote peer.

remote_as attribute is the AS number of the remote peer.

class os_ken.services.protocols.bgp.application.OSKenBGPSpeaker(*args, **kwargs)

Base application for implementing BGP applications.

start()

Hook that is called after startup initialization is done.

os_ken.services.protocols.bgp.application.load_config(config_file)

Validates the given file for use as the settings file for BGPSpeaker and loads the configuration from the given file as a module instance.

os_ken.services.protocols.bgp.application.validate_rpc_host(ip)

Validates the given ip for use as RPC server address.