PLANET CS-2001 - Manual (Page 764)

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Remove Blocking Command
 This command instructs the core switch to discontinue blocking an IP/MAC
address.
Show Blocking Commands
 This command is used to view the IP/MAC addresses that the switch is blocking.
Note:
1. When the system detects the internal anomaly flow, the switch will use the following variables
to block IP/MAC address, unblock already blocked IP/MAC addresses and view IP/MAC
addresses.
 _ip_: indicates a blocked IP address.
 _mac_: indicates a blocked MAC address.
 _port_: indicates one of the switch ports.