Discovery in the
Alcatel-Lucent environment
MPLS VPN-Tagging Server discovery in the Alcatel-Lucent
environment shows the design architecture of MPLS VPN overlapping IP
discovery in the Alcatel-Lucent environment.
MPLS VPN-Tagging Server
discovery in the Alcatel-Lucent environment
The
MPLS VPN-Tagging Server
sends CLI discovery requests to the
(the Adapter) in an attempt to
discover VRF-based network connections for Lucent-Alcatel routers or switches.
When the
MPLS VPN-Tagging Server
discovers these connections, it sends the connection information to
IP Availability Manager
so
that
IP Availability Manager
is
able to distinguish overlapping IPs on the same device.
Overlapping IP discovery of Alcatel-Lucent devices is triggered in any
of the following ways:
- When theMPLS VPN-Tagging Serverstarts up.At startup, theMPLS VPN-Tagging Serverimports a list of Alcatel-Lucent devices from its sourceIP Availability Managerand performs a full discovery. The devices are identified in the Global_TopologyCollection objects that the Adapter creates inIP Availability Manager.
- When theMPLS VPN-Tagging Serverreceives, fromIP Availability Manager, a DiscoveredLastAt attribute update for a Global_TopologyCollection object.The Adapter changes the date of a global object’s DiscoveredLastAt attribute whenever the Adapter:
- Connects toIP Availability Managerand creates the global object.
- Adds new devices to the global object.TheMPLS VPN-Tagging Serversubscribes to DiscoveredLastAt attribute updates.
- When theMPLS VPN-Tagging Serverreceives, from the Adapter, a RouteChangedLastAt attribute update for an Alcatel-Lucent device.The Adapter sets a device’s RouteChangedLastAt attribute to a new date whenever the Adapter learns of a new or changed route for the device. TheMPLS VPN-Tagging Serversubscribes to RouteChangedLastAt attribute updates.When theMPLS VPN-Tagging Serverreceives a RouteChangedLastAt attribute update for a device, it places the device in its discovery queue. During the next scheduled full-discovery interval, as defined in the BASEDIR/smarts/conf/vpn-tagging/vpn-tagging.conf file, theMPLS VPN-Tagging Serverdiscovers the device.When initiating a discovery of an Alcatel-Lucent device, theMPLS VPN-Tagging Serversends to the Adapter a CLI request that includes the device’s name. The Adapter executes the request and returns the output to theMPLS VPN-Tagging Server.A CLI request contains the following CLI command:show router <VRF name> route-tableThe execution of the CLI command yields the IP route-distinguisher tag and other related network connection information for the target device. TheMPLS VPN-Tagging Serverwrites that information toIP Availability Manager’s Network Connection table.