Cisco ASR1004-10G-SHA/K9 - ASR 1004 Sec+HA Bundle Router Uživatelský manuál stáhnout pdf (Strana 77)

Networx Enterprise Contract

8.0 SEDs Enterprise – QE0405.01E

1517 GS00T07NSD0040 January 6, 2014

Data contained on this page is subject to the restrictions on the title page of this contract.

8.1.2 Satisfaction of Performance Metrics (L.34.1.8.1 (d)

Each SED in a suite (see Figure 8.1-1 above) has been designed to

meet all of the performance metrics for the services associated with its

requirement set. The standard monitoring for Service Level Agreement (SLA)

reporting operates as follows:

 The Control and Collection process causes a series of probe

messages to be generated for a customer’s network on a periodic

basis (generally every five minutes).

 The BRIX appliances located at the appropriate PE device for each

service (e.g., CIPS, NBIP-VPNS, etc.) generate probe messages

(generally Internet Control Message Protocol (ICMP) and echo

requests called pings).

 Messages are sent from the BRIX at each PE to each CE device.

 Messages are also sent from the BRIX at each PE to every other

PE that provides service for the Agency’s network.

 Data generated by the Control and Collection process is provided

to the Processing task, which creates a full latency, jitter, and

packet loss maps for the customer’s network.

– Latency = “SDP A-to-PE A” + “PE A to PE B” + “PE B + SDP B”

where each measurement is the ICMP ECHO round-trip time.

– Jitter = Average of the differences in latency measurements

over time

– Packet loss = observed ICMP ECHO packet losses on a per-link

basis (also combined with CA™eHealth that interrogates the

physical and logical interfaces for packet error statistics)

 The processing task also correlates all measurements to the

Agency’s network and provides that information for presentation in

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Cisco ASR1004-10G-SHA/K9 - ASR 1004 Sec+HA Bundle Router Uživatelský manuál Strana 77