R2511-HP MSR Router Series Terminal Access Configuration Guide(V5)

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• For the third case, you must configure the corresponding device in the inittab file.
• For the fourth case, you must configure the router and the Unix server to use the same application
mode.
Terminal echoing speed is low
Use the ttyd administration program to check the system resource occupation rate of the Unix server. If the
rate is relatively high, locate which service process is abnormal and, if necessary, kill the process.
If the rate is not high, open the ttyd configuration file to examine whether the sendsize and readsize
options are properly configured. For low speed WAN links (at 9600 bps for example), the two options
must be modified accordingly.
In addition, for higher terminal echoing speed, TTY one-to-one mode is recommended.
The terminal displays abnormally for some banking services
Some banking services require certain types of terminal emulation. Terminal emulation type is configured
for each pseudo terminal in system file /etc/ttytype on the Unix server. When upgrading network devices,
if you modify pseudo terminal numbers, you must edit the system file to add terminal emulation types for
the new pseudo terminals. Taking ttyp50 as an example, you must add the following line to the file
/etc/ttytype:
vt100 ttyp50
If a pseudo terminal is configured with no terminal emulation type in file /etc/ttytype on the Unix server,
the pseudo terminal uses the default emulation type unknown, and the prompt message at login displays
"TERM = (unknown)".
Some pseudo terminals cannot be opened
After ttyd is started, if the log does not prompt that a terminal is open, the terminal is not open. Check the
configuration file to see whether the terminal has a valid name.
If other configurations are all correct but the log shows that some pseudo terminals cannot be opened,
check whether the terminals are under directory /dev. If not, try to use another existing pseudo terminal
or create the pseudo terminal. If yes, check whether a process is using the pseudo terminal.
The status of a terminal is not OK but UP on the router
If a terminal is correctly connected to the router, its status should be OK when you use the display rta
command. If its status is UP, terminal access has not been started, and you must use the rta server enable
command in system view on the router to enable terminal access.
The TCP connection is intermittently up/establishing and down
• Verify that the same application mode (TTY many-to-one or TTY one-to-one) is configured on both
the router and the Unix server.
• Verify that the router and Unix server are configured consistently and that the configurations comply
with the parameter configuration conventions. Most mistakes result from inconsistent configurations.
• Check whether source address binding is configured. With source address binding configured, the
router IP address configured on the Unix server must be the bound IP address.
• Verify that correct routes are configured on both the router and Unix server.
Illegible characters are displayed when a terminal handles a service
Check whether test, redrawing, switching hotkeys and the like are configured. Hotkey values may conflict
with data. You can change the hotkey values.