Configuring Synchronous Links

To configure synchronous links you must define one or more synchronous devices, and the IP interfaces that will be associated with them.

Configuring Synchronous Devices

1. Enter the Unix device name of the serial port for this link.

   The two on-board serial ports are named zsh0 (port A) and zsh1 (port B). High speed interface ports have names of the form hihn.

   Unix device for serial interface (zsh0, hih0, ...): zsh0

2. Specify the type of clocking for the port.

   Choose Internal, if the system baud rate provides clocking, or External if the clock is provided by some other device. You can also specify your own clocking parameters for the transmit (txc) and receive (rxc) clocks.

   Type of clocking for this port [1] - Internal (loopback=no txc=baud rxc=rxc) [2] - External (loopback=no txc=txc rxc=rxc) [3] - Specify own clocking parameters Your choice [1]:

3. Specify the line speed, if required.

   If you chose internal clocking in the previous step, you must also specify the line speed for the device. The default value 19200 is the optimum line speed for the on-board serial interfaces (zshn). .

   Line speed [19200]:

4. Confirm the configuration of your synchronous device.

   The script displays the choices you selected. Type y to add this device to the configuration file.

   sync_device syncdev0 unix_device zsh0 line_speed 19200 tx_clock baud rx_clock rxc Ok to add this entry? [y]: y

Configuring IP Interfaces for Synchronous Devices

1. Enter the local IP address.

   Enter a hostname that appears in the file /etc/hosts on your machine, or enter an IP address using dot notation. Press Return to accept the default hostname.

   Local IP address [papyrus]: 129.xxx.xxx.11

2. Enter the remote IP address.

   Enter a hostname that appears in the file /etc/hosts on your machine, or enter an IP address using dot notation.

   Remote IP address: epic

3. Enter the Maximum Transmission Unit (MTU).

   By default, the MTU is set to 1500, which is the optimum value for Ethernet connections, and is sufficient in most cases. Enter a new value for the MTU (between 60 and 8232), or press Return to accept the default.

   IP Maximum Transmission Unit (MTU) [1500]:

4. Enter the names of the synchronous devices that the interface will use.

   The script displays a list of all the synchronous devices that you defined earlier. If you associate several devices with a single synchronous interface, you enable load-sharing for this link.

   Select synchronous interfaces for ipdptp0 Choose between: zsh0 zsh1 Enter a comma separated list : zsh0,zsh1

5. Confirm the configuration of your IP interface.

   The script displays the choices you selected. Type y to add this device to the configuration file.

   ifconfig ipdptp0 plumb ifconfig ipdptp0 papyrus epic mtu 1500 netmask 255.255.255.0 up sync_path ip_interfaceipdptp0 unix_devicezsh0 sync_path ip_interfaceipdptp0 unix_devicezsh1 Ok to add this configuration [y]? y