User Guide

Chapter 3 Managing the network access devices 89
Nortel Secure Network Access Switch 4050 User Guide
Reimporting the network access device SSH key using
the CLI
Whenever the network access device generates a new public SSH key, you must
import the new key into the Nortel SNAS 4050 domain.
1 Use the
/cfg/domain #/switch #/sshkey/del command to delete the
original key.
2 Enter
Apply to apply the change immediately.
3 Use the
/cfg/domain #/switch #/sshkey/import command to import
the new key.
4 Enter
Apply to apply the change immediately.
For more information about the commands, see “Managing SSH keys for Nortel
SNA communication using the CLI” on page 88.
Monitoring switch health using the CLI
The Nortel SNAS 4050 continually monitors the health of the network access
devices. At specified intervals, a health check daemon sends queries and
responses to the switch as a heartbeat mechanism. If no activity (heartbeat) is
detected, the daemon will retry the health check for a specified number of times
(the dead count). If there is still no heartbeat, then after a further interval (the
status-quo interval) the network access device moves all its clients into the Red
VLAN. When connectivity is re-established, the Nortel SNAS 4050 synchronizes
sessions with the network access device.
The health check interval, dead count, and status-quo interval are configurable.
To configure the interval and dead count parameters for the Nortel SNAS 4050
health checks and status-quo mode, use the following command:
/cfg/domain #/switch #/hlthchk
The HealthCheck menu displays.