SynOptics Network Management Protocol

Table 1. SONMP product support

Feature	Product	Release introduced
SONMP	5320 Series	Fabric Engine 8.6
	5420 Series	VOSS 8.4
	5520 Series	VOSS 8.2.5
	5720 Series	Fabric Engine 8.7
	7520 Series	Fabric Engine 8.10
	7720 Series	Fabric Engine 8.10
	VSP 4450 Series	VSP 4000 4.0
	VSP 4900 Series	VOSS 8.1
	VSP 7200 Series	VOSS 4.2.1
	VSP 7400 Series	VOSS 8.0
	VSP 8200 Series	VSP 8200 4.0
	VSP 8400 Series	VOSS 4.2
	VSP 8600 Series	VSP 8600 4.5
	XA1400 Series	VOSS 8.0.50

The switch supports an auto-discovery protocol known as the SynOptics Network Management Protocol (SONMP). SONMP allows a network management station (NMS) to formulate a map that shows the interconnections between Layer 2 devices in a network. SONMP is also called Topology Discovery Protocol (TDP).

All devices in a network that are SONMP-enabled send hello packets to their immediate neighbors, that is, to interconnecting Layer 2 devices. A hello packet advertises the existence of the sending device and provides basic information about the device, such as the IP address and MAC address. The hello packets allow each device to construct a topology table of its immediate neighbors. A network management station periodically polls devices in its network for these topology tables, and then uses the data to formulate a topology map.

If you disable SONMP, the system stops transmitting and acknowledging SONMP hello packets. In addition, the system removes all entries in the topology table except its own entry. If you enable SONMP, the system transmits a hello packet every 12 seconds. The default status is enabled.

SONMP for the Segmented Management Instance

SONMP and LLDP both advertise the same topology IP address for the Segmented Management Instance management interface. SONMP supports IPv4 advertisement only. If all three management interfaces are configured, the advertised default topology IP priority is management CLIP, then management VLAN, then management OOB. You can change the default topology IP using CLI or EDM. If multiple IPv4 addresses are configured on an OOB or VLAN management interface, the advertised IP priority is static IP address, then DHCP IP address, then link-local IP address.