To ensure that TRMM has an accurate ring map, you must issue the following command for each port that has a MAC-less station (such as token-ring tracing tools) attached to it:

SET PORT {slot.port} STATION_TYPE mac_not_present

8250 token-ring modules are shipped from the factory, with mac_presentas default, which must be used for normal stations.

You also need to issue the following command for each copper trunk port to ensure the correct port-to-address mapping:

SET TRUNK {slot} RING_IN.{trunk port} NETWORK_MAP {externalinternal}

In the above command you must specify external when the copper trunk port is used to connect to a module on a different hub, and you must specify internal when the copper trunk port is used to connect to a module on the same hub.

The Beacon packet. The Beacon packet contains the source of the beaconing and its Nearest Active Upstream Neighbor (NAUN). The NAUN is the destination address of this packet.

Information from the media modules indicating ports and trunks which have just been enabled.

User setup indicating which ports have MAC-less stations (that is do not participate in ring poll process).

User setup indicating the status of the external_beacon_recovery attribute on the trunks.

With TRMM V3.0 the operator can issue the following commands for the trunks:

SET TRUNK {slot} RING_IN.n EXTERNAL_BEACON_RECOVERY {existsnon_exists} or

SET TRUNK {slot} RING_IN EXTERNAL_BEACON_RECOVERY {existsnon_exists}

The effects of issuing this command for a trunk are discussed later in this section.

When beaconing is detected, the TRMM waits for up to 3 seconds to verify beaconing is still active. The TRMM will then attempt to use the last current logical map of the concentrator to determine the cause of the beaconing. Depending on the reaction of other adapters to the beaconing condition (that is, some adapters will be removed to test the beaconing condition) the map may not EXACTLY represent the state of all ports at the exact time of beaconing. This is why different steps of the algorithm are performed to attempt to find the beaconing condition even if the map has changed.

The following steps will be taken to try to determine the cause of beaconing. After each step, the algorithm will wait up to 10 seconds to verify that beaconing is gone to see if an action worked. The 10 second delay is necessary to prevent errors due to the cause of the beaconing removing itself to test its lobe port connections at the same time an action is taken. This could erroneously cause a port/trunk to be disabled which was not the source of the problem. If the action did not fix the beaconing the TRMM will undo the action (that is, re-enable port if it was disabled) and go to the next step.

1.Shut down the most likely cause of beaconing - new trunk connections * or newly enabled ports (newindicating TRMM has not seen a valid MAC

address after a port or trunk was enabled).

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IBM 8260 manual SET Port slot.port Stationtype macnotpresent, SET Trunk slot RINGIN.trunk port Networkmap externalinternal

8260 specifications

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