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Article #95871

Re: Acterna FST 2802

#95871
From: Frutka
Date: Mon, 02 Jan 2012 20:34
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"dacula"  napisał w wiadomości grup 
dyskusyjnych:2aaf4348-3819-4a83-b899-cb488d157e71@m10g2000vbc.googlegroups.com...

Witam,

czy korzystal moze ktos z Was z tego modelu miernika?
Chcialbym za jego pomoca wykonac wiarygodny pomiar L2 za pomoca ramek
multicast, ale niestety mimo zalozenia petli potrafie uzyskac tylko
strumien w jednym kierunku.

Dla unicastow bez problemu przy petli moge wykonac test, a multicasty
nie wracaja.
---

A jak sobie wyobrażasz wygenerowanie w mierniku certyfikacyjnym czegoś 
nielegalnego?:

IEEE 802.3-2002, Section 3.2.3(b):

"The first bit (LSB) shall be used in the Destination Address field as an
address type designation bit to identify the Destination Address either
as an individual or as a group address. If this bit is 0, it shall
indicate that the address field contains an individual address. If this
bit is 1, it shall indicate that the address field contains a group
address that identifies none, one or more, or all of the stations connected
to the LAN. In the Source Address field, the first bit is reserved and
set to 0.
".
Jeżeli łącze jest typu L1 (np. DWDM) to zrób po prostu pętlę fizyczną i ci 
ramki wrócą bez zamiany adresów src<->dst.
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From: "Frutka" <ewcia@niema.pl>
Newsgroups: pl.internet.polip
Subject: Re: Acterna FST 2802
Date: Mon, 2 Jan 2012 21:34:29 +0100
Organization: Netia S.A.
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