Cisco Cisco Prime Network 3.8 プリント
© 2012 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information.
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White Paper
Immediate Network Synchronization with Low
Overhead: Cisco Prime Network Reduced Polling
VNE
Overhead: Cisco Prime Network Reduced Polling
VNE
Cisco Prime
™
Network's near real-time model relies on accurate information about the
managed network typically obtained through repeated polling of network elements
that imposes an overhead burden on devices, the telemetry network, and Cisco Prime
Network servers. To relieve this burden, the Reduced Polling virtual network element
(VNE) has been added to Cisco Prime Network's VNE framework. The Reduced
Polling VNE implements a low-overhead method for keeping Cisco Prime Network's
device information synchronized with network elements in a timely manner without the
drawbacks of repeated polling. Network users can expect to see a vast reduction in
polling compared to repeated polling.
that imposes an overhead burden on devices, the telemetry network, and Cisco Prime
Network servers. To relieve this burden, the Reduced Polling virtual network element
(VNE) has been added to Cisco Prime Network's VNE framework. The Reduced
Polling VNE implements a low-overhead method for keeping Cisco Prime Network's
device information synchronized with network elements in a timely manner without the
drawbacks of repeated polling. Network users can expect to see a vast reduction in
polling compared to repeated polling.
Cisco Prime Network brings a new level of control to users for managing individual devices across the network. In
addition to supporting a wide range of network elements, new capabilities within Cisco Prime Network provide
complete visibility into each device’s logical and physical configuration, software image, dynamic characteristics,
and relationships to other devices. Users are able to take advantage of these capabilities, which are integrated to
work across all Cisco
®
devices as well as many non-Cisco products, even in networks with elements from multiple
vendors.
Timely access to comprehensive device information is critical to improving network efficiency and avoiding costly
downtime. As a consequence, maintaining an up-to-date database of each device and its complete profile is
essential. For some network elements, particularly those supporting large numbers of interfaces and
subinterfaces, traditional polling methods using either command-line interface (CLI) commands or Simple Network
Management Protocol (SNMP) requests can result in extensive queries or bulk data retrievals, which can
negatively affect performance.
With the increase in device visibility and the amount of information that must be kept updated, network users need
a more efficient alternative to traditional polling methods. The introduction of the Reduced Polling VNE capabilities
in Cisco Prime Network gives network users the ability to maximize visibility and productivity without overwhelming
the network elements being managed: a typical device is polled 85 percent less compared to standard polling. The
result is a network carrying significantly fewer queries retrieving less data to dramatically improve CPU loading,
telemetry bandwidth, and Cisco Prime Network server processing efficiency.
The benchmarks in Table 1 illustrate the drastic reduction in commands sent by Cisco Prime Network to a network
element when the Reduced Polling VNE is enabled. Command counts were collected from a 7600 Series Router
and an ASR 9000 device located within a Carrier Ethernet network. The network was configured with Multiprotocol
Label Switching (MPLS), Virtual Private LAN Services (VPLS), and corresponding pseudowires traversing the
MPLS network. Data was collected for a 1-hour period after initial discovery and after the VNE reached the
operational state. Total commands include SNMP and Telnet commands.