Address-To-Port Mapping For Per-Port Switching Modules; Address-To-Port Map Display For Mac-Less Stations; Address-To-Port Mapping On Per-Port Switching Modules - IBM Nways 8260 Manual

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
but as soon it sees an AMP/SMP with the A/C bit set to B
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
164
8260 Multiprotocol Intelligent Switching Hub
8260> show ring_map token_ring logical token_ring_1
Token Ring Logical Map for Network TOKEN_RING_1
MAC Address Slot
----------------- -----
02-00-00-c0-cc-1c 05.01
02-00-00-c0-cc-0a 05.01
02-00-00-e0-9c-10 05.01
08-00-8f-40-01-a6 05.01
00-00-00-00-00-00 05.01
8260>
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.
Port
----
1
2
2
3
4
this frame is issued