Adds LLDP (Link Layer Discovery Protocol) topology discovery capability
to the agent for local network neighbor detection.
New Features:
- LLDP-MIB walker for discovering network neighbors via SNMP
- New LLDP_TOPOLOGY job type for topology discovery jobs
- Automatic IPv4 and IPv6 management address parsing
- Bulk neighbor discovery with full port information
Protocol Buffers:
- Added LldpTopologyResult message for topology data
- Added LldpNeighbor message for individual neighbor info
- Extended JobType enum with LLDP_TOPOLOGY (value 5)
Implementation:
- lldp.go: LLDP discovery logic with SNMP walking
- agent.go: Job dispatch and result channel handling
- Updated handleMessage signature to support LLDP results
- Result sent to Phoenix via "lldp_topology_result" event
LLDP-MIB OIDs:
- 1.0.8802.1.1.2.1.3.3.0 (lldpLocSysName)
- 1.0.8802.1.1.2.1.3.7.1.4 (lldpLocPortDesc)
- 1.0.8802.1.1.2.1.4.1.1.7 (lldpRemPortId)
- 1.0.8802.1.1.2.1.4.1.1.8 (lldpRemPortDesc)
- 1.0.8802.1.1.2.1.4.1.1.9 (lldpRemSysName)
- 1.0.8802.1.1.2.1.4.2.1.3 (lldpRemManAddr)
This enables the Phoenix web application to dispatch LLDP discovery
jobs to agents for local neighbor detection, reducing SNMP load on the
Phoenix server and improving discovery performance.
