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8260> show ring_map token_ring logical token_ring_1
Token Ring Logical Map for Network TOKEN_RING_1
MAC Address Slot Port
----------------- ----- ----
02-00-00-c0-cc-1c 05.01 1
02-00-00-c0-cc-0a 05.01 2
02-00-00-e0-9c-10 05.01 2
08-00-8f-40-01-a6 05.01 3
00-00-00-00-00-00 05.01 4
8260>
Figure 101. Address-to-Port Map Display for MAC-less Stations
8.11 Address-to-Port Mapping for Per-Port Switching Modules
The per-port switching modules take advantage of the Ring Monitor function to
build an address-to-port map.
The Ring Monitor function on each port is normally situated upstream of its
associated port and listen for the neighbor notification process looking for
AMP/SMP MAC frames, as shown in Figure 102.
Figure 102. Address-to-Port Mapping on Per-Port Switching Modules
Ring Monitor ignores all the AMP/SMP MAC frames that have A/C bit set to B′1′,
but as soon it sees an AMP/SMP with the A/C bit set to B′0′ (this frame is issued
by the station immediately upstream of this Ring Monitor) it moves to the
downstream side of its associated port and tracks the AMP/SMP MAC frame.
After moving downstream of its port, one of the following may happen:
1. The Ring Monitor will not see any AMP/SMP frame by the time that it is
asked by the Ring Monitor downstream of it to move back upstream of its
associated port. This means that there is a MAC-less station attached to
that port.
Note: The MAC-less stations do not send AMP/SMP frames.
164 8260 Multiprotocol Intelligent Switching Hub