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NetMRI's Switch Port Management (SPM) page (Network Explorer –> Switch Port Management) solves all of these issues. SPM enables both big-picture and highly focused views of an entire switched Ethernet network, from the overall network layer to individual devices and interfaces. Extending throughout the entire switched network, all endpoints are detected, tabulated and monitored by NetMRI.
NetMRI can perform near-real-time polling of any part of the switched Ethernet network from the distribution level to any LAN switch. Network polling settings can be customized for any device group and administrators can execute a poll of a device group or the entire switched network at any time.
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Note: The switches and switch-routers have already been discovered by NetMRI. Switch Port Management polls switches for a detailed collection of information on switch port connectivity, status of ports and end devices. For information, see Running the Setup Wizard, Configuring Network Discovery Settings and Running Network Discovery on Routed and Switched Networks.
NetMRI gives explicitly licensed devices priority in determining which devices to manage. Unlicensed devices continue to be managed by the appliance, but the appliance periodically collects only basic discovery data. See Other Network View Operations for more information.
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- Available Ports %: The percentage of all managed switch ports appearing as Available.
- PoE Ports: The count of Cisco switched Ethernet ports running the Power over Ethernet switching protocol for IP telephony applications.
Choosing Devices Present shows the total of all switches' contributions to each of the six capacity categories. Choosing any other device group rewrites the Capacity Summary – Ports pane to reflect the subset of values for the selected device group
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Beneath the Capacity Summary – Ports pane, the Devices Present table appears displaying the data sets for all devices in the chosen data group. Each table row reflects a data set record obtained from LAN switching devices from a process called polling. The Devices Present table designation is for all devices in the chosen data set–not for all devices in the network.
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NetMRI uses ARP cache refresh to control LAN switches from which switch-forwarding data is collected.
When ARP cache refresh is enabled for a LAN switch, before further collection of switch-forwarding data, NetMRI pings all known IP addresses known to exist as members of the device's switch-forwarding table, by relating previously gathered switch-forwarding data MAC addresses to determine their IP addresses. Because this requires a prior SPM poll, the first poll of any switch by SPM after the device is added to the license will not perform an ARP cache refresh.
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