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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R011C10

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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Configuring the MAC Address Limiting Function

Configuring the MAC Address Limiting Function

Context

An insecure network is vulnerable to MAC address attacks. When hackers send a large number of forged packets with different source MAC addresses to the switch, the MAC address table of the switch will be filled with useless MAC address entries. As a result, the switch cannot learn source MAC addresses of valid packets.

You can limit the number of MAC address entries learned on the switch. When the number of learned MAC address entries reaches the limit, the switch does not learn new MAC address entries. You can also configure an action to take when the number of MAC address entries reaches the limit. This prevents MAC address attacks and improves network security.

Procedure

  • Limit the number of MAC address entries learned on an interface.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run mac-limit maximum max-num

      The maximum number of MAC address entries that can be learned on the interface is set.

      By default, the number of MAC address entries learned on an interface is not limited.

    4. Run mac-limit action { discard | forward }

      The action to take when the number of learned MAC address entries reaches the limit is configured.

      By default, the switch discards packets with new MAC addresses when the number of learned MAC address entries reaches the limit.

    5. Run mac-limit alarm { disable | enable }

      The switch is configured to or not to generate an alarm when the number of learned MAC address entries reaches the limit.

      By default, the switch generates an alarm when the number of learned MAC address entries reaches the limit.

  • Limit the number of MAC address entries learned in a VLAN.
    1. Run system-view

      The system view is displayed.

    2. Run vlan vlan-id

      The VLAN view is displayed.

    3. Run mac-limit maximum max-num

      The maximum number of MAC address entries learned in the VLAN is set.

      By default, the number of MAC address entries learned in a VLAN is not limited.

    4. Run mac-limit action { discard | forward }

      The action to take when the number of learned MAC address entries reaches the limit is configured.

      By default, the switch discards packets with new MAC addresses when the number of learned MAC address entries reaches the limit.

      SA boards of S series and F series cards do not support the discard action.

    5. Run mac-limit alarm { disable | enable }

      The switch is configured to or not to generate an alarm when the number of learned MAC address entries reaches the limit.

      By default, the switch generates an alarm when the number of learned MAC address entries reaches the limit.

  • Limit the number of MAC address entries learned in a VSI.
    1. Run system-view

      The system view is displayed.

    2. Run vsi vsi-name

      The VSI view is displayed.

    3. Run mac-limit maximum max-num

      The maximum number of MAC address entries learned in the VSI is set.

      By default, the number of MAC address entries learned in a VSI is not limited.

      Only the E series cards, X series cards, FA series cards of the S7700&S9700 support this configuration.

    4. Run mac-limit action { discard | forward }

      The action to take when the number of learned MAC address entries reaches the limit is configured.

      By default, the switch discards packets with new MAC addresses when the number of learned MAC address entries reaches the limit.

    5. Run mac-limit alarm { disable | enable }

      The switch is configured to or not to generate an alarm when the number of learned MAC address entries reaches the limit.

      By default, the switch sends an alarm when the number of learned MAC address entries reaches the limit.

  • Limit the number of MAC address entries learned in a slot.
    1. Run system-view

      The system view is displayed.

    2. Run mac-limit slot slot-id maximum max-num

      The maximum number of MAC address entries learned in a slot is set.

      By default, the number of MAC address entries learned in a slot is not limited.

    3. Run mac-limit slot slot-id action { discard | forward }

      The action to take when the number of learned MAC address entries reaches the limit is configured.

      By default, the switch discards packets with new MAC addresses when the number of learned MAC address entries reaches the limit.

    4. Run mac-limit slot slot-id alarm { disable | enable }

      The switch is configured to or not to generate an alarm when the number of learned MAC address entries reaches the limit.

      By default, the switch sends an alarm when the number of learned MAC address entries reaches the limit.

Verifying the Configuration

Run the display mac-limit command to check limiting on MAC address learning.

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Updated: 2019-10-18

Document ID: EDOC1000178310

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