FUJITSU PSWITCH
User’s Guide
112
December/2018
sFlow Agents keep a list of counter sources being sampled.
When a Packet Flow Sample is generated the sFlow Agent examines the list and
adds counters to the sample datagram, least recently sampled first. Counters are
only added to the datagram if the sources are within a short period, 5 seconds
say, of failing to meet the required Sampling Interval.
Periodically, say every second, the sFlow Agent examines the list of counter
sources and sends any counters that must be sent to meet the sampling interval
requirement.
The set of counters is a fixed set.
3.1.6.3.
Statistics
The Statistics Manager is a software package designed to collect, evaluate, and
present statistical data essential to the functioning of the software. The Statistics
Manager creates metrics based on counters throughout the software and is
responsible for keeping the client or administration formed of the nature of the
data flow associated with the software. This package was created with generic
components to permit its reuse irrespective of the type or position of the system.
Located in the application layer, the Statistics Manager draws required statistical
information from components such as the NIM at the request of the client. The
Statistics Manager maintains a pool of current counters that may be updated or
reset depending upon the client's requirements. The components of the Statistics
Manager, outlined in the following sections, communicate with each other
internally to provide accurate data without making the client aware of the internal
manipulations involved. For performance reasons, counters are created
dynamically as the client requires them, even though the corresponding counter
may be calculated at lower layers. The Statistics Manager begins keeping track of a
particular counter when a client requests the counter. Therefore, the software
design assumes that the client provides the Statistics Manager with the required
information about individual counters that need to be maintained.
Currently Statistics Manager supports in the following components:
RMON, Dot1x, Radius, Port-Channel, VPC, DHCP Relay, DHCP Snooping, LLDP, QCN,
FIP Snooping, Priority-Flow-Control, ARP, IPv4, OSPF, VRRP, IP Helper, IPv6, OSPFv3,
IPv6 DHCP, IPv6 DHCP Snooping, BGP, PIM and MLD.
3.1.7.
QoS (Quality of Service)
Quality of Service (QoS) ensures timely delivery of specific type of application data
