ME4 Series storage systems support Service Location Protocol (SLP, srvloc), which is a service discovery protocol that allows computers and other devices to find services in a LAN without prior configuration. SLP is open for use on all operating systems, and does not require formal licensing.
SLP is based on User Datagram Protocol (UDP) and can use Transmission Control Protocol (TCP) if needed. SLP listens on port 427. When a client, or User Agent (UA), connects to a network, the client queries for Directory Agents (DA) on the network. If no DA responds, the client assumes a DA-less network and sends a multicast UDP query. All Service Agents (SA) that contain query matches will send a UDP answer to the client. If the answer message is too large, the client can repeat the query using TCP.
In a network with DAs, each SA must register all services with a DA. Then the clients will query the DAs, who will respond to the query with its cached SA information.
Through use of DAs, SLP can also scale beyond the local area network to large enterprise, which is an enterprise IT issue. Consult the IETF RFC2165.
When SLP is enabled, the storage system will advertise the interfaces shown in
Table 1 and populate the configuration attributes shown in
Table 2.
You can enable or disable the SLP service in the
PowerVault Manager, as described in
Enable or disable system-management settings, or by using the CLI
set protocols command, as described in the
Dell PowerVault ME4 Series Storage System CLI Guide.
If the SLP service is enabled, you can test it by using an open source tool, such as slptool from
www.openslp.org.
Table 1. Interfaces advertised by SLP
Interface (protocol) description
Advertisement string
HTTP
service:api:http
HTTPS
service:api:https
Telnet
service:ui:telnet
SSH
service:ui:ssh
FTP/SFTP (firmware upgrade)
service:firmware-update:ftp/sftp
SNMP
service:api:snmp
Table 2. SLP attributes shown for a storage system
SLP attribute
Corresponding property shown by the CLI show systemdetail command in XML API mode
x-system-name
system-name
x-system-contact
system-contact
x-system-location
system-location
x-system-information
system-information
x-midplane-serial-number
midplane-serial-number
x-vendor-name
vendor-name
x-product-id
product-id
x-product-brand
product-brand
x-wwnn
current-node-wwn
x-platform-type
platform-type
x-bundle-version
no correspondingproperty
x-build-date
no correspondingproperty
x-mac-address
no correspondingproperty
x-top-level-assembly-part-number
no correspondingproperty
x-top-level-assembly-serial-number
no correspondingproperty
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