gtpc1m1zTransmission Control Protocol/Internet Protocol

CDLC IP Connections

After you have defined the local IP addresses for your TPF system, you must define the IP routers.

Defining CDLC IP Connections

You can define the IP routers by entering the ZTTCP DEFINE command. For each IP router, specify its symbolic device address (SDA) and the local (TPF) IP address to which it connects. The IP address of the IP router itself is not defined to the TPF system. Instead, this information is found dynamically when the connection to the IP router is activated.

Refer to an IP router by its SDA. The SDA is the unique token that identifies an IP router and is used as input to the ZTTCP commands, which define, change, display, delete, activate, trace, or deactivate an IP router.

Multiple IP routers can be connected to the same local IP address in a TPF host. This enables a TPF host to present a single interface (one IP address) to the remainder of the network.

You can change the TPF IP address associated with the IP router by entering the ZTTCP CHANGE command. However, the IP router must be deactivated before making this change. You can define as many as 200 IP routers per TPF host.

Activating and Deactivating CDLC IP Routers

IP routers are activated by entering the ZTTCP ACTIVATE command and they are deactivated by entering the ZTTCP INACTIVATE command. You can activate or deactivate all IP routers, one specific IP router, or all IP routers associated with a specific TPF IP address.

When you enter a ZTTCP ACTIVATE command, the IP router is marked as active in the IP configuration record. This causes the TPF system to activate the IP router, reactivate the IP router after a network failure, and reactivate the IP router after an IPL of the TPF system. The TPF system will try to keep the IP router active until you issue a ZTTCP INACTIVATE command.

When you enter a ZTTCP INACTIVATE command, a flag is set in the entry for IP router in the IP configuration record. This prevents the IP router from always becoming active, including across an IPL of the TPF system.

In a TPF production system environment where you want all IP routers active, include the ZTTCP ACTIVATE ALL command with your cycle-up procedures.

Deleting CDLC IP Routers

Enter the ZTTCP DELETE command to delete an IP router; however, you must deactivate the IP router before it can be deleted by entering the ZTTCP INACTIVATE command.