Black Box TS255A Spezifikationen PDF herunterladen (Seite 53)

Can I “team” NICs in my analyzer?

Chapter 5 FAQ and Troubleshooting

rev. 1

transmission unit), the receiving device could restart the negotiation

process. For more details, see “Not seeing traffic at the analyzer from

the TAP” on page 56.

If you are attempting to daisy chain Aggregator TAPs to more than

two analyzers and you are certain your MTU on the receiving devices

is high enough, contact Black Box Support for assistance.

Can I “team” NICs in my analyzer?

Yes, it is possible, with some caveats.

Sometimes it is desirable to use two standard full-duplex NICs to

capture full-duplex TAP output for analysis. Because a standard NIC

port has only one receive channel, you must aggregate the receive

channels from two ports to see both sides of the two-way connection

being monitored. Intel’s Advanced Network Services allows you to

team multiple connections at the driver level, presenting your

analyzer with an aggregated view of send and receive channels.

Because of the processing overhead and its affect on NIC

performance, this method is not recommended for monitoring

moderate to highly saturated links, such as those between switches.

However, it can be an economical alternative when monitoring more

lightly used connections, such as between a server and switch.

In addition to the bandwidth limitations, connection teaming is also

less accurate when timestamping packets, which can cause

unexpected results when your analyzer attempts to display certain

charts and statistics such as Connection Dynamics or VoIP jitter. You

also will not be able to tell which side is DCE vs. DTE. In short, if you

do not have a dual-receive analysis NIC, it is always better to analyze

the SPAN or port mirror session through a standard NIC rather than

using the connection teaming method described here.

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Black Box TS255A Spezifikationen Seite 53