Symmetricom Time Server user manual Symmetricom Snmp Configuration, Key Word Definition

Appendix D: SNMP – Simple Network Management Protocol Symmetricom SNMP Configuration

D.2 Symmetricom SNMP Configuration

SNMP offers a security authentication scheme that is based on a common password shared by the management station and a group of agents. A group of hosts are known as a community. Any management station or agent can be a member of any combination of communities. Typically a manager will need to change the SNMP community information from Symmetricom’s SNMP agent factory defaults for security purposes. However, the factory default SNMP community settings are chosen to make the Symmetricom SNMP immediately usable. Symmetricom’s SNMP agent recognizes up to five separate SNMP communities. These communities are configured through the serial or Telnet interface using the F100 NTP command, where the “menus” referred to in this section appear. Each community has several configurable parameters that are defined in Table D-1.

	Table D-1: SNMP Community Configurable Parameters
Key Word	Definition
Community	The name of this community. The name is limited to up to 32 ASCII letters, numbers or
Name	punctuation letters. This is the name that a management SNMP PDU (packet) specifies. If
	the community name of an incoming PDU does not match any of the five community
	names, the packet is ignored and an optional authentication trap message can be
	generated. See traps below. An empty string field disables the community name.
Trusted IP	If the Use Trusted IP flag is set to yes, then this is the table of IP host addresses that this
Address	community recognizes as valid SNMP management hosts. Even if the community name of
	an incoming PDU matches this community, the source IP address must match one of the
	IP addresses in this table, or the packet is ignored and an optional authentication error trap
	message is issued. Setting an IP address to all zeros turns off that IP address entry. In
	addition, this table also serves as the list of hosts that SNMP trap messages are sent to –
	regardless of the state of the Use Trusted IP flag.
Use	If this flag is set to yes, then the Trusted IP Address table is used in addition to the
Trusted IP	Community Name for authentication of incoming PDUs).
R/W	For a particular community, the SNMP variables are set to read only, or normal SNMP
Access	access. This allows the manager to have a public known community from which anyone
	may read the SNMP data base and a separate private community that has full normal read
	and write access to the SNMP database.
	Note: SNMP MIB II does not define all variables to be writeable. SNMP variables defined
	by RFC-1213 as read-only remain read-only, regardless of the state of this R/W Access
	flag.
Trap	When this flag is set to yes, trap messages are issued for this community.
Enable
	Note: This enables/disables all traps (both coldstart and authentication).
Trap Port	A trap port other than the normal SNMP trap port of 162 may be specified.
	Note: This address must be chosen carefully, or conflicts with other protocols may occur.
Save	When any setting is changed, this becomes visible and answering yes immediately saves
Settings	the changes to Symmetricom’s SNMP. Answering No will negate the changes.

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