User guide

March 2005 Building Your Canopy Network
Through Software Release 6.1
Page 182 of 425 Issue 1
Canopy System User Guide
SNMP Community String
Specify a control string that allows an Network Management Station (NMS) to access
SNMP information. No spaces are allowed in this string. The default string is Canopy.
The SNMP Community String value is clear text and is readable by a packet monitor.
Additional security derives from the configuration of the SNMP Accessing Subnet, Trap
Address, and Permission parameters.
SNMP Accessing Subnet
Specify the addresses that are allowed to send SNMP requests to this CMMmicro. The
NMS has an address that is among these addresses (this subnet). You must enter both
◦ The network IP address in the form xxx.xxx.xxx.xxx
◦ The CIDR (Classless Interdomain Routing) prefix length in the form /xx
For example
◦ the /16 in 198.32.0.0/16 specifies a subnet mask of 255.255.0.0 (the first 16 bits
in the address range are identical among all members of the subnet).
◦ 192.168.102.0 specifies that any device whose IP address is in the range
192.168.102.0 to 192.168.102.254 can send SNMP requests to the CMMmicro,
presuming that the device supplies the correct SNMP Community String value.
RECOMMENDATION:
For more information on CIDR, execute an Internet search on “Classless
Interdomain Routing.”
The default treatment is to allow all networks access.
Trap Address
Specify the IP address (xxx.xxx.xxx.xxx) of a Network Management Station (NMS) to
which trap information should be sent. Trap information informs the monitoring system
that something has occurred. For example, trap information is sent
◦ after a reboot of the module.
◦ when an NMS attempts to access agent information but either
− supplied an inappropriate community string or SNMP version number.
− is associated with a subnet to which access is disallowed.
Permission
Select Read Only if you wish to disallow any parameter changes by the NMS.
Site Name
Specify a string to associate with the physical module. This parameter is written into the
sysName SNMP MIB-II object and can be polled by an NMS. The buffer size for this field
is 128 characters.