Atec Agilent-J3763A - Manual (Page 14)

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LAN over WAN, and LAN (over WAN) over ATM
Encapsulated LAN data is automatically extracted and decoded by the Advisor
including complex encapsulated protocols. For unique encapsulation schemes,
you can specify the offset as well. Nearly 300 decodes exist for layer 3 and
above; these are common to all underlying technologies (LAN, WAN and ATM).
The Advisor provides an off-line LAN Expert Analysis tool. The off-line LAN
Expert Analysis examines Ethernet, Fast Ethernet, Gigabit Ethernet, ATM or
WAN (HDLC or Frame Relay) encapsulated LAN frames on an Advisor or
personal PC without Advisor hardware.
The comprehensive set of protocol decodes include all of today’s popular
Protocol Stacks:
• TCP/IP • SUN
• AppleTalk • XNS
• Banyan • Cisco
• DECnet • 3Com
• IBM/SNA • Microsoft LAN Manager
• Novell • H.323 series, T.38
• ISO • SIP, MGCP, SGCP, MEGACO
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The Advisor now offers real-time IP and WAN filtering at rates up to 155Mb/s
(up to DS3 for Frame Relay). This allows the user to isolate and analyze LAN
and Frame Relay traffic taking place on an ATM circuit or LAN traffic taking
place on a Frame Relay circuit.
The real time filtering function provides application-level, LAN-centric
troubleshooting on their ATM or Frame Relay network, thus allowing them to
see specific traffic types that may be causing trouble on the network. The user
can even filter by IP source and/or destination address IP traffic that is
encapsulated in Frame Relay, which is, in turn, encapsulated in ATM. This
feature maximizes valuable buffer space for optimal data collection of targeted
LAN traffic since the filtering takes place before data capture.
In addition to capture filtering, which is performed in hardware, the Advisor is
able to gather counts of events such as cells or frames that meet the filtering
criteria. More details of these features are given in technology specific sections
in this specification.
Powerful display (post-capture) filtering and search functionality allows the
user to drill down further for troubleshooting purposes when post processing
data from capture buffer or file.
Capture Filters and Counters
Hardware counters and filters let you select frames to bring into the capture
buffer. The Advisor will capture every frame, no matter what the traffic level,
and that is exactly what you need.