IBM TS4500, Introduction And Planning Manual

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Port information communications can be initiated either by the tape library or by
the host. Typically, the library initiates a connection when it is responding to the
host. However, in the case of unsolicited messages such as statistics notifications
and operator interventions, the library initiates a connection through port 3494. If
the library needs to make a connection to the host, it chooses a temporary port. It
then uses that port to make an outbound connection to a 3494 listening port on the
host. When the host has a message to deliver to the library, it chooses its own
ephemeral port. The host uses this port to make an outbound connection to
listening port 3494 on the library manager. The connection is only maintained for
the duration that is required to pass a single message, and then it is disabled.
Table 21 on page 56 describes the minimum level of connectivity that is required to
perform library operations. Other ports that might be opened up on the firewall,
but are not necessary to have full functions include;
v
The standard HTTP port, 80, allows inbound communication to the library from
the TS4500 management GUI.
v
Ports 161 and 162 are the standard ports for sending SNMP traps. (SNMP traps
can be sent from the TS4500 tape library or from the IMC. The tape library can
be configured to send traps to SNMP target machines. In this case, the firewall
needs to allow outbound connections from the library from its port 161 to port
162 on the listening SNMP target machine.
Figure 12 illustrates all of the external communication connections to the TS4500
tape library control system.
The host interface is provided by the drives. The library communicates with the
drives though the Library/Drive Interface. The Ethernet port, and modem port
does not have any direct access to the Library/Drive Interface. All communication
between the various interfaces is through the library control system.
Figure 12. External communication connections to the TS4500 tape library control system
Chapter 1. Overview
57