17
Where can I download the free software to test IGMP?
Answer:
Please go to this link
http://pf.itd.nrl.navy.mil/projects.php?name=mgen
.
Encapsulation:
The different types of encapsulation include PPPoA VC-Mux, PPPoA
LLC, 1483 Bridged IP LLC, 1483 Routed IP LLC, 1483 Bridged IP VC-Mux, 1483 Routed
IP VC-Mux, Classical IP over ATM, PPPoE VC-Mux, PPPoE LLC, and PPPoENone.
5.2.1 ATM
VPI:
Virtual Path Identifier is a virtual path used for cell routing that is identified by an
eight bit field in the ATM cell header. The VPI field specifies this eight bit identifier for
routing.
Range: 0-255
Default: 0
VCI:
A Virtual Channel Identifier is a virtual channel that is identified by a unique nu-
merical tag that is defined by a 16-bit field in the ATM cell header. The purpose of the
virtual channel is to identify where the cell should travel. The VCI field specifies this 16 bit
numerical tag that determines the destination.
Range: 0-65535
Default: 35
Service Category:
This field allows you to select from the following service categories.
l
UBR (default):
When configured as UBR (Unspecified Bit Rate), traffic is deliv-
ered with best efforts but with no guarantee. This allows for fluctuation in times of
temporary increase of available bandwidth. For example, if a PVC with CBR is
temporarily inactive, the PVC(s) with UBR will utilize that bandwidth while it is
available. UBR is intended for applications that do not require any maximum
bound on the transfer delay.
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CBR:
When a PVC is specified as a CBR (Constant Bit Rate), that PVC is guar-
anteed a certain bandwidth, characterized by the Peak Cell Rate (PCR). The CBR
does not have to transmit with a peak cell rate, and when it does, it is only when
the bandwidth specified by the PCR is guaranteed.
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VBR-nrt:
An PVC enabled with VBR-nrt (Variable Bit Rate - non real time) can
transmit a cell only if the PVC has a token available. The PVC accumulates tokens
at the rate of the Sustainable Cell Rate, and the PVC can only accumulate a
maximum of the value specified by Maximum Burst Size tokens.
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