A bandwidth monitor measures specific usage of bandwidth of an interface through either WMI or SNMP.
You can set up alerts for throughput above or below a specified threshold, measured in absolute kbps or percentage of the total available.
When To Use
Use to monitor
- the ISP firewall connection via SNMP for an end-customer site
- specific server NICs
- the interfaces on an Ethernet or VoIP switch
Bandwidth Monitors on SNMP Interfaces
When using this feature with SNMP interfaces, this is the format used in the Identifier list:
ifdesc [ifidx] [ifspeed] [iftype] [ifidx]
ifdescis the SNMP Interface description (for example, FastEthernet0/1)
ifidxis the SNMP index entry into the interface table (what Barracuda Managed Workplace actually uses to find the interface)
ifspeedis the SNMP interface speed (not always present)
iftypeis assigned by the Internet Assigned Numbers Authority (IANA)
On a switch or router, the SNMP interface description is related to the MAC address for the interface, but it is not the MAC address itself. The mapping between the two is both link layer and vendor-specific. For example, serial lines do not have a MAC address, VLANs may have an Administrator-defined MAC address mapping.
On a Cisco switch, if you take the last two hexidecimal digits of the MAC address for each of the FastEthernet ports and convert it to decimal, you will get the number shown after the slash (for example, MAC #00-02-4B-C1-23-01 = FastEthernet0/1, MAC #00-02-4B-C1-23-0A = FastEthernet0/10). The zero in "FastEthernet0" refers to the media type.
Some SNMP devices allow the Administrator to modify the interface description to use more user-friendly names. By doing this you can make selecting the right interface easier. Note that while the interface description usually maps in an obvious way to physical ports on the network element (left to right sequential numbering, for example), this mapping is also vendor- and sometimes model-specific.
Barracuda Managed Workplace does not show the IP or MAC address in the list because the information is only known to Onsite Manager if it is monitoring all ports on the network element. This occurs when Onsite Manager is configured to scan all those ports and this information is displayed in the description box if it is available.
To add a monitor for Bandwidth
- In Service Center, click Configuration > Monitor & Alert Rules.
- From the Site list, select the site where the device is located.
- From the Device list, select the device to which you want to add a monitor.
- Click Add Monitor.
- From the Choose Monitor Type list, select Bandwidth.
- Click Add Monitor.
- In the Monitor tab, type a title for the monitor.
- Optionally, type a description for the monitor.
- Ensure the Enabled check box is selected.
- In the Interface Selection section, select an Identifier from the list.
- Optionally, in the Speed box, type the value.
- From the Duplex Mode list, select either Half Duplex or Full Duplex.
- From the Polling Interval list, select an appropriate time to set how frequently the data is captured.
- Do one of the following to set when the monitor runs:
- To set the monitor to run all the time, do nothing.
- To change when the monitor runs, click Run Always to open the Select Interval dialog box and select either the Daily Interval or Specific Interval option button and use the corresponding lists to define the monitoring. Click OK.
- To configure an alert, see Setting Alert Actions.
- Click Save.