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Flag ... Flag Address Control I FCS Flag
Key: Flag 8-bit sequence (01111110)
Address 8/16 bits in length
Control 16 bits if Modulus is 123; 8 bits if Modulus is 8
I (Information) Contains n bytes of data
FPS 16-bit or 32-bit frame check sequence
Monitored Events
Works in conjunction with the Events for Error parameter to define the
quality of service metric for the Frame Relay DCE/DTE connection.
Default: 4
Range: 1 to 10
The two parameters specify a j out of k relationship used to measure circuit
reliability as follows. If the number of faulty status exchanges (Status
Inquiry, Link Integrity Verification, Full Status Inquiry, and/or Full Status
Report messages) in a continuous sequence of k (Monitored Events) such as
events, equals or exceeds j (Events for Error), the interface is declared
down. While the connection is down, status exchanges continue. Once j
consecutive status exchanges are transferred without error, the connection
is restored to the active state.
Multicast Support
Frame Relay multicast support lets the multiprotocol router take advantage
of the multicast functionality offered (or expected to be offered) by some
Frame Relay service providers. Frame Relay multicasting reserves certain
network-assigned DLCIs as multicast addresses. The Frame Relay network
maps multiple recipients (an address group) to this single DLCI and delivers
copies of a single Frame Relay packet to each member of the address group.
As the packet passes through the Frame Relay network, the DLCI is
manipulated so that the packet recipient receives a DLCI indicating the
actual packet source (not the multicast DLCI). Multicasting is generally used
in certain address resolution techniques and for applications requiring
delivery of identical information to multiple recipients. You can configure
the following for multicast support:
ARP multicast DLCI AppleTalk multicast DLCI
Bridge Flood multicast DLCI DECnet multicast DLCI
OSI multicast DLCI General multicast DLCI
Figure 4-2. HDLC Frame Format
Circuit Parameters
Parameters and Options
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