★Configuring the device as a Telnet redirect server does not take effect

Example:

The customer uses the SIC-16AS-H3 asynchronous serial port SIC interface module to connect to the console port of the Ruijie device for management. Currently, the asynchronous serial port is up, but the business is blocked. For the Ruijie device connected to Asy1/0-Asy1/3, check the interface Output direction, the packages are all 0:

  ===============display interface=============== 

Async1/0

Current state: UP

Description: Async1/0 Interface

Bandwidth: 9 kbps

Internet protocol processing: Disabled

Output queue - Urgent queuing: Size/Length/Discards 0/1024/0

Output queue - Protocol queuing: Size/Length/Discards 0/500/0

Output queue - FIFO queuing: Size/Length/Discards 0/75/0

Last link flapping: 1 hours 50 minutes 57 seconds

Last clearing of counters: Never

Current system time:2024-01-27 07:28:17 UTC+8+08:00:00

Last time when physical state changed to up:2024-01-27 05:37:21 UTC+8+08:00:00

Last time when physical state changed to down:2024-01-26 05:10:41 UTC+8+08:00:00

Physical layer: asynchronous, Baudrate: 9600 bps

Phy-mru: 1700

Last 300 seconds input rate: 4.46 bytes/sec, 35 bits/sec, 0.29 packets/sec

Last 300 seconds output rate: 0.00 bytes/sec, 0 bits/sec, 0.00 packets/sec

Input:

  195 packets, 2943 bytes

  0 broadcasts, 0 multicasts

  33592 errors, 0 runts, 0 giants

  0 CRC, 0 align errors, 33592 overruns

  0 aborts, 0 no buffers, 0 frame errors

Output:

  0 packets, 0 bytes

  0 errors, 0 underruns, 0 collisions

  0 deferred

DCD: DOWN, DTR: UP, DSR: UP, RTS: UP, CTS: DOWN

1.      Check that the configuration is basically correct against the configuration example:

#

interface Async1/0

 async-mode flow

 undo detect dsr-dtr

#

line tty 33

 undo shell

 user-role network-operator

 redirect enable

 redirect listen-port 3001

 redirect timeout 0

#

2.      Open debug: debugging physic all interface async1/0 and see the following log information:

*Jan 27 07:23:43:365 2024 DRVDBG/7/debugging:

(Async1/0)PHY/ERR:  ATTransmit:CTS is invalid in hardware flow contorl

Key commands are missing under the line tty interface and need to be added:

#
line tty 33
flow-control none
#