An aggregation node, attached to NMS through a VPRN service, aggregates all nodes to be discovered using the same VPRN. The node is configured with:
a management VPRN
a loopback address in VPRN
a physical interface in the VPRN with an optional unnumbered interface inheriting the IP address from the loopback IP (this is a light VPRN where the uplink is a SAP and not a spoke-SDP)
optional VLAN DOT1Q support for the L3 interface
OSPF on the physical L3 interface in the VPRN (SAP)
SNMP (SNMPv3) on an L3 interface in the VPRN (SAP) toward the NMS
a MIB table build based on the OSPF type 10 opaque LSA and stored in the OSPF opaque database
This node converts the OSPF LSA type 10 opaque information arriving from the discovered nodes into an SNMP MIB table and updates the NMS with the MIB. The NMS uses the MIB to discover the node and opens a SSH or Telnet session to configure the node accordingly.
The node to be discovered is provisioned with a management VRF as described in Node discovery procedure. All of the necessary node information needed for the node discovery is advertised by OSPF using LSA type 10 opaque. Nodes can be chained together, so the LSA type 10 needs to be forwarded all the way to the aggregation node.
NMS discovers the node using SNMP MIB traps or it can walk the MIB table.
NMS connects to the discovered node using SSH or Telnet to update the configuration by CLI. The operator must ensure that none of their commands disable the management VPRN and disconnect the discovered node from NMS.