Symmetricom Time Server User Manual download pdf (Page 122)

D-108 TimeVault™ User’s Manual 6000-100AppD.fm Rev. D

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

Name

The name of this community. The name is limited to up to 32 ASCII letters, numbers or

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

Address

If the Use Trusted IP flag is set to yes, then this is the table of IP host addresses that this

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

Trusted IP

If this flag is set to yes, then the Trusted IP Address table is used in addition to the

Community Name for authentication of incoming PDUs).

R/W

Access

For a particular community, the SNMP variables are set to read only, or normal SNMP

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

Enable

When this flag is set to yes, trap messages are issued for this community.

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

Settings

When any setting is changed, this becomes visible and answering yes immediately saves

the changes to Symmetricom’s SNMP. Answering No will negate the changes.

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