
Configuring Line Services
1-12
Neighbor Information Frames identify the upstream and downstream neighbors of
each node. After the nodes learn the addresses of their upstream neighbors, you
can use the addresses to create a logical map showing the order in which nodes
appear in the token path. A Bay Networks station issues a response to the sender
of a NIF frame and generates NIF requests as part of the neighbor notification
process.
Status Information Frames exchange information about each node, including the
status of each port on the node. You can use SIFs to create a physical map showing
the position of each station in the FDDI network. There are two types of SIFs:
• SIF configuration frames, which show the configuration information of a
node.
• SIF operation frames, which show the operational information of a node. A
Bay Networks station issues a response to the sender of a SIF request frame.
Echo Frames verify that nodes on an FDDI network can communicate with each
other. Echo frames are used to test connectivity only. A node sends an echo
request (which is a directed packet) to another FDDI node. The receiver of the
echo request copies the data that appears in the information field of the frame and
transmits an echo response frame back to the originator of the echo request. A Bay
Networks station issues a response to the sender of an echo request frame.
Request Denied Frames deny requests from the network. If the SMT agent
receives a frame with an unsupported SMT version or an unknown frame type, it
sends a Request Denied frame. A Bay Networks station issues an RDF Response
frame.
Table 1-1. SMT Frame Classes and Types
Frame Class Frame Type
Neighbor Information Frames (NIF) Request/Response
Status Information Frames (SIF) Response
Echo Frames (ECF) Response
Request Denied Frames (RDF) Response
Status Report Frames (SRF) Announcement
Parameter Management Frames (PMF)
(PMF Get Response only)
Response
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