3Com MSR 30, MSR 50 manual Mac-address max-mac-count Ethernet interface view

2482 CHAPTER 165: MAC ADDRESS TABLE MANAGEMENT CONFIGURATION COMMANDS

■You may need to disable MAC address learning sometimes to prevent the MAC address table from being saturated, for example, when your device is being attacked by a great deal of packets with different source MAC addresses. This somewhat affects update of the MAC address table.

■As disabling MAC address learning may result in broadcast storms, you need to enable broadcast storm suppression after you disable MAC address learning on a port.

Related command: display mac-addressmac-learning.

Example # Disable global MAC address learning.

<Sysname> system-view

[Sysname] mac-address mac-learning disable

# Disable MAC address learning on the interface Ethernet 1/0.

<Sysname> system-view

[Sysname] interface ethernet 1/0

[Sysname-Ethernet1/0] mac-address mac-learning disable

mac-address max-mac-count (Ethernet interface view)

Syntax mac-address max-mac-count { count disable-forwarding }

undo mac-address max-mac-count [ disable-forwarding ]

View Ethernet interface view, aggregation port group view

Parameter count: Maximum number of MAC addresses that can be learned on a port. When the argument takes 0, the VLAN is not allowed to learn MAC addresses. The value range for this argument varies with devices.

disable-forwarding: Disables forwarding of frames with unknown destination MAC addresses after the number of learned MAC addresses reaches the upper limit.

Description Use the mac-addressmax-mac-countcount command to configure the maximum number of MAC addresses that can be learned on an Ethernet port.

Use the mac-address max-mac-count disable-forwarding command to configure whether forwarding frames with unknown destination MAC addresses is allowed after the number of learned MAC addresses reaches the upper limit.

Use the undo mac-addressmax-mac-countcommand to restore the default maximum number of MAC addresses that can be learned on an Ethernet port.

Use the undo mac-address max-mac-count disable-forwarding command to allow forwarding frames received on an Ethernet port with unknown destination MAC addresses after the number of learned MAC addresses reached the upper limit.