General DataCommc SpectraComm ES, Installation & Operation Manuals

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Additional Features Overview of Additional Features
076R204-000 SpectraComm ES Ethernet Switch 5-11
Issue 2 Installation and Operation Manual
Down-sampling of Mirrored Traffic
The main purpose of down-sampling mirrored traffic is to reduce congestion at the capture port.
When mirroring is enabled, the divide block is used. The divide value [n] will take every nth traffic
sample of the traffic from all mirror-enabled ports and forward them to the capture port.
Note
The divisor number [n] is set for both ingress and egress.
Figure 5-8
Example: Down-Sampling
Figure 5-8 demonstrates down-sampling and mirroring traffic working together to provide
flexibility when mirroring traffic to a capture port. In this example, the user has configured port1
for ingress mirroring, port7 for egress mirroring, and port8 for both ingress and egress mirroring.
Situation A:
Port1, port7, port8 and the capture port are all set for 100Mbps full-duplex mode.
• The user should set the divide value equal to the total number of traffic directions being
mirrored. In this situation, n = 4 would avoid congestion at the capture port.
• If the capture port is set for only 10Mbps, the user should set the divide value to n = 40 to avoid
congestion.
Situation B:
Port1, port7 and port8 are set to 100Mbps half-duplex mode, and the capture port is set to 100Mbps
half- or full-duplex mode.
• The user should set the divide value to n = 1 to avoid congestion at the capture port.
• If the capture port is set for only 10Mbps, the user should set the divide value to n = 10 to avoid
congestion.
DOWN-SAMPLED TRAFFIC
(PORTS 1, 7, 8)
SC-ES
PORT 1
(INGRESS)
PORT 7
(EGRESS)
.
.
.
PORT 8
(BOTH INGRESS
AND EGRESS)
PORT 9
ROUTER
PROBE/
ANALYZER
(CAPTURE)
FILTER
FILTER
FILTER
D
I
V
I
D
E