Extreme Networks Switch Cheatsheet

show ports no-refresh

Displays a summary of all ports.

show ports 1 no-refresh

Displays a summary of a specific port (e.g., Port 1).

show ports 1 information details

Provides detailed information about a specific port (e.g., Port 1).

configure ports 1 display-string "Customer Description"

Adds a custom description to a port (e.g., Port 1).

unconfigure ports 1 display-string

Removes the custom description from a port (e.g., Port 1).

configure ports 1 auto off speed 100 duplex full

Configures a port to 100Mbps, full-duplex, and disables auto-negotiation (e.g., Port 1).

configure ports 1 auto on

Enables auto-negotiation on a port, allowing it to negotiate speed and duplex automatically (e.g., Port 1).

disable ports 1

Shuts down/disables a specific port (e.g., Port 1).

enable ports 1

Enables a specific port (e.g., Port 1).

show vlan

Displays a summary of all configured VLANs on the switch.

show vlan ports 1

Displays the VLAN configuration for a specific port (e.g., Port 1).

create vlan vlan_228

Creates a new VLAN with the name vlan_228.

configure vlan vlan_228 tag 228

Assigns a VLAN ID (tag) to a previously created VLAN (e.g., vlan_228 will have ID 228).

configure vlan vlan_5 add port 1 untagged

Adds a port to a VLAN as an untagged member (access port). Use for single VLAN per port (e.g., Port 1 to vlan_5).

configure vlan vlan_5 add port 1 tagged

Adds a port to a VLAN as a tagged member (trunk port). Use for multiple VLANs per port (e.g., Port 1 to vlan_5).

configure vlan vlan_1126 add port 1 tagged

Adds a port to another VLAN as a tagged member, for multiple VLANs on a trunk port (e.g., Port 1 to vlan_1126).

configure vlan vlan_228 delete ports 1

Removes a port from a specific VLAN (e.g., Port 1 from vlan_228).

configure vlan vlan_1522 ipaddress 10.200.0.201 255.255.255.0

Configures a virtual IP address on a VLAN interface, making it a Layer 3 VLAN (e.g., vlan_1522).

show fdb ports 1

Displays the MAC address table entries learned on a specific port (e.g., Port 1), showing connected client devices.

show fdb vlan vlan_228

Displays the MAC address table entries for a specific VLAN (e.g., vlan_228), useful for seeing devices on that VLAN or identifying trunk ports (if a trunk port is part of this VLAN).

show ports redundant

Displays information about redundant port configurations (e.g., LACP, EAPS).

show ports 1 transceiver information detail

Displays detailed information about the SFP/transceiver in a specific port, including power levels (e.g., Port 1).

debug hal show optic-info ddmi port 1

Provides detailed DDM (Digital Diagnostic Monitoring) information for the SFP in a specific port, including current, voltage, and temperature (e.g., Port 1).

debug hal show optic-info port 1

Displays general SFP information, including type, part number, and serial number (e.g., Port 1).

configure elrp-client disable-port exclude port 5

Excludes a specific port from being disabled by ELRP (e.g., Primary Port 5).

configure elrp-client disable-port exclude port 6

Excludes another specific port from being disabled by ELRP (e.g., Secondary Port 6).

configure elrp-client periodic vlan_228 ports all interval 8 log-and-trap disable-port permanent

Configures ELRP to periodically check for loops on vlan_228 across all ports. If a loop is detected, it will log, trap, and permanently disable the offending port(s). Note: Replace vlan_228 with your desired VLAN ID.