Cabletron Systems CyberSWITCH CSX150 User Manual

Also see for CyberSWITCH CSX150: User guide Quick start guide

Contents

Small Office Remote Access Switch 135C ONFIGURING SYSTEM O PTIONS AND I NFORMATIONAdministrative SessionE MERGENCY TELNET SERVER P ORT N UMBER B ACKGROUND INFORMATIONThere are some Telnet client programs that do not clear Telnet connections when terminatingTelnet sessions. Since they do not clear the Telnet connections, those connections stay alive andsoon all Telnet sessions are used up. Once this happens, no more Telnet sessions can be establisheduntil the inactivity timer of one of the sessions expires.However, if the idle timer of the administrative session is disabled, you may need to reboot theCyberSWITCH. To avoid this, a special Telnet server that uses a particular TCP port is provided. Ifyou Telnet into this special server (the Emergency Telnet Server) you will be placed into a sessionwhich prompts you for an action on each of the existing Telnet sessions.The emergency Telnet session allows you to terminate Telnet sessions only when all Telnet sessionsare used up. An emergency Telnet server is available to clean up dead Telnet sessions. This Telnetserver needs a unique port number in order to function.The following example screen illustrates a successful emergency Telnet session:The following screen illustrates a situation where Telnet sessions are still available. The EmergencyTelnet session then simply informs you that you can not terminate Telnet sessions under thesecircumstances (no emergency exists).Emergency Telnet session activeEnter password(s) for ’ADMIN’ user.Enter password: ******Login-Id Sess-Id Date/Time Idle (sec) Command Type (From)-------- ------- ------------ ---------- -------- ------------------------ADMIN 257 May 20 12:34 800 MANAGE Telnet (199.120.211.70)Do you wish to terminate this session (Y or N) [default = Y]? Login-Id Sess-Id Date/Time Idle (sec) Command Type (From)-------- ------- ------------ ---------- -------- ---------------ADMIN 511 May 20 12:30 1025 SHELL 199.120.211.71Do you wish to terminate this session (Y or N) [default = Y]? Login-Id Sess-Id Date/Time Idle (sec) Command Type (From)-------- ------- ------------ ---------- -------- ---------------ADMIN 734 May 20 12:35 740 LOGIN 199.120.211.69Do you wish to terminate this session (Y or N) [default = Y]? Emergency Telnet session activeEnter password(s) for ’ADMIN’ user.Enter password: ******There are Telnet connections available for administrative sessions.Please use an administrative session to terminate abandoned sessions.