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Logical Link Control Overview
117357-A Rev. A
1-3
WAN interfaces
-- Frame Relay Boundary Network Node (BNN) and Boundary Access
Node (BAN) interfaces
-- Any other WAN media supporting Source Route Bridge (SRB) traffic,
including Point-to-Point (PPP)
Frame Relay Support
F
igure 1-1 illustrates the connection of a host through a Frame Relay network, in
a configuration with multiprotocol traffic to other locations.
Bay Networks provides two ways to communicate directly with an SNA processor
(such as an IBM 3745 or AS/400) over Frame Relay:
Boundary Network Node (RFC 1490)
Boundary Access Node
Boundary Network Node (RFC 1490)
The Boundary Network Node (BNN) refers to RFC 1490, Routed SNA over
Frame Relay. This implementation of LLC2 also complies with the Frame Relay
Forum 3 (FRF.3), “Multiple Protocol Encapsulation over Frame Relay
Implementation Agreements,” which defines how SNA traffic traverses a Frame
Relay network.
BNN allows native SNA traffic (originating from SDLC LAN- or WAN-attached
devices) to communicate over public or private Frame Relay networks directly
with an SNA processor. Devices can communicate with intermediate routing
nodes or in a single-switch configuration function as a Frame Relay Access
Device (FRAD).
Since BNN does
not
carry the destination and source MAC addresses in the
network packets, the BNN format carries the fewest number of bits per packet and
yields low network overhead. Therefore, you must explicitly define the permanent
virtual circuit (PVC) to carry the packet to its destination. You do this with the
LLC2 Frame Relay Mapping Table. The mapping table consists of three fields:
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