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134 Chapter 6 Managing BCM50 with SNMP
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BCM50 supports read-only SNMP requests, even for SNMP variables that display as read-write.
BCM50 does not support configuration operations through SNMP. Variables that are not
supported are displayed as “0”.
Configuring routers to use Element Manager with SNMP
Before you use the BCM for SNMP management, you must ensure that the BCM and the optional
integrated router are configured to allow SNMP queries to be received and responded to. You will
need to correctly configure NAT and Firewall settings for the router. For information on using the
router web-based interface to modify these settings, see the BCM50 Installation Guide and the
BCM50 Networking Guide. The sections below provide an overview of configuring the router to
enable SNMP management.
Connecting through the WAN
In this scenario, the LAN is configured as a private network with no public access. Before
beginning configuration, ensure that both the BCM50 and the SNMP Management Station are
working correctly. If you are using the BCM50a or BCM50e, only SNMPv1 is supported. If you
are using an external router, you can use those versions of SNMP supported by that router. To
enable SNMP, you must configure firewall settings, add NAT rules, and configure the SNMP port.
Configuring firewall settings
If the firewall is enabled on the router, several rules must be added so that the SNMP Management
Station and the BCM50 can communicate. If you are using a BCM50a or BCM50e, these settings
are configured in the Router manager. The first rule allows WAN to WAN communication:
• Source address: Management station’s IP Address, or “any”
• Destination address: Router’s WAN IP Address
• Service Type: SNMP (TCP/UDP: 163)
• Action: forward
The second rule allow WAN to LAN communication:
• Source address: Management station’s IP Address, or “any”
• Destination address: BCM50 LAN IP Address. This is the IP Address listed in Element
Manager under System/IP Subsystem/General Settings.
• Service Type: SNMP (TCP/UDP: 161)
• Action: forward
Adding NAT rules
In the NAT section of the router configuration, create a rule with the following settings:
• Start port: 161
• End port: 161