Specifications

106 ExtremeWare XOS 11.0 Concepts Guide
Forwarding Database
MAC-Based Security
MAC-based security allows you to control the way the FDB is learned and populated. By managing
entries in the FDB, you can block, assign priority (queues), and control packet flows on a per-address
basis.
MAC-based security allows you to limit the number of dynamically-learned MAC addresses allowed
per virtual port. You can also “lock” the FDB entries for a virtual port, so that the current entries will
not change, and no additional addresses can be learned on the port.
You can also prioritize or stop packet flows based on the source MAC address of the ingress VLAN or
the destination MAC address of the egress VLAN.
For detailed information about MAC-based security, see Chapter 10.
Displaying FDB Entries
To display FDB entries, use the following command:
show fdb {<mac_addr> | broadcast-mac | permanent | ports <portlist> | vlan
<vlan_name>}
where the following is true:
• mac_address—Displays the entry for a particular MAC address.
• broadcast-mac—Specifies the broadcast MAC address. May be used as an alternate to the
colon-separated byte form of the address ff:ff:ff:ff:ff:ff
• permanent—Displays all permanent entries, including the ingress and egress QoS profiles.
• ports <portlist>—Displays the entries for a set of ports or slots and ports.
• vlan <vlan name>—Displays the entries for a VLAN.
With no options, the command displays all FDB entries. (The age parameter does not show on the
display for the backup MSM; it does show on the display for the primary MSM.)
See the ExtremeWare XOS Command Reference Guide Software Version 11.0 for details of the commands
related to the FDB.