HP Web Jetadmin Software Instrukcja Użytkownika Pobierz pdf (Strona 167)

The other option to control the reach of the discoveries is to congure the multicast request to span a certain

number of routers (Congure the General Settings for Device Discoveries on page 64). Spanning routers will

require the routers to be congured to allow multicast request to be forwarded.

The discovery could also be aected by the conguration of your local rewall (Discovering Devices with

HP Web Jetadmin through Firewalls on page 136).

If the router is congured to pass multicast requests on to other sections of the network, and Discovery is

congured to cross multiple routers, then a discovery could potentially discover devices across multiple subnets

and perhaps your entire network.

Details About Running an SLP Multicast Discovery

(For network device discoveries only.)

If one of the discovery methods you choose is SLP multicast (while creating templates (Create Discovery

Templates on page 166), editing templates (Edit Discovery Templates on page 168), or scheduling (Schedule

Discoveries on page 163)), then the Choose SLP multicast settings page is displayed. On this page, select the

number of routers to cross (or hops) for the discovery. Increasing the number of hops might increase the amount

of time for the discovery to complete; plus, it generates more network trac than a discovery with fewer routers

to cross.

HP Web Jetadmin does not add devices that cannot be resolved and managed via SNMP, which might be due to

insucient credentials, to the device list. HP Web Jetadmin enforces device manageability through SNMP before

adding devices to the device list.

IP Broadcast Discovery

IP Broadcast discoveries send SNMP query packets (in the form of IP broadcasts) to one or more IP network(s).

These are used in both PC-Connected and network device discoveries.

IP Broadcast Discoveries for Network Devices

An IP Broadcast discovery enables you to nd devices or HP Web Jetadmin installations when IP broadcast

addressees are known. IP broadcast discoveries send SNMP query packets (in the form of IP broadcasts) to one

or more IP network(s). One network-specic broadcast address exists for each IP subnet on an IP intranet. IP

subnets are determined by the IP network number and the IP subnet mask. IP calculators, available free on the

Internet, are a great way to determine IP broadcast addresses. An all 1s IP broadcast can also be used to query

the entire intranet. Broadcasting is typically blocked by routers due to trac spike concerns.

Characteristics of IP broadcast discoveries for network devices include:

●

Sends SNMP queries over one or more IP broadcasts.

●

Listens for replies and then qualies network connected devices.

●

Default broadcast is the Global Broadcast Address (255.255.255.255).

●

Can use one or more known IP broadcast addresses with optional address descriptions.

●

Limited checking is performed to determine if the broadcast address is valid.

●

Fast and thorough, especially on a local segment.

●

Most modern networks block broadcast trac.

ENWW Discovery 141

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