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Disabling MAC Address Learning

Context

You can disable MAC address learning on an interface, in a VLAN, and for a specified flow.

The MAC address learning function is enabled by default on the switch. When receiving a data frame, the switch records the source MAC address of the data frame and the interface that receives the data frame in a MAC address entry. When receiving data frames destined for this MAC address, the switch forwards the data frames through the outbound interface according to the MAC address entry. The MAC address learning function reduces broadcast packets on a network. After MAC address learning is disabled on an interface, the switch does not learn source MAC addresses of data frames received by the interface, but the dynamic MAC address entries learned on the interface are not immediately deleted. These dynamic MAC address entries are deleted after the aging time expires or can be manually deleted using commands.

Procedure

  • Disable MAC address learning 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-address learning disable [ action { discard | forward } ]

      MAC address learning is disabled on the interface.

      By default, MAC address learning is enabled on an interface.

      If action is specified, the switch handles packets based on the selected action. The forward action causes the switch to forward packets according to the MAC address table (this is the default action). The discard action causes the switch to forward packets according to the MAC address table only if an entry matching the source MAC address is found. If no entry is found, the switch discards the packets.

  • Disable MAC address learning 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-address learning disable

      MAC address learning is disabled in the VLAN.

      By default, MAC address learning is enabled in a VLAN.

    For the S5720-EI, if MAC address learning is disabled in a VLAN and an interface in the VLAN has the discard action configured, the interface does not discard packets from this VLAN. Take, for example, a scenario where MAC address learning is disabled in VLAN 2 but enabled in VLAN 3 and Port1 belongs to both VLANs. If Port1 has MAC address learning disabled and the discard action is defined, Port1 discards packets from VLAN 3 but forwards packets from VLAN 2.

  • Disable MAC address learning for a specified flow.
    1. Configure a traffic classifier.

      1. Run system-view

        The system view is displayed.

      2. Run traffic classifier classifier-name [ operator { and | or } ]

        A traffic classifier is created and the traffic classifier view is displayed, or the view of an existing traffic classifier is displayed.

        The logical operator and between the rules in the traffic classifier means that:

        • If the traffic classifier contains ACL rules, packets match the traffic classifier only if they match one ACL rule and all the non-ACL rules.

        • If the traffic classifier does not contain any ACL rules, packets match the traffic classifier only if they match all the rules in the classifier.

        The logical operator or means that packets match the traffic classifier if they match one of the rules in the classifier.

        By default, the relationship between rules in a traffic classifier is or.

      3. Configure matching rules in the traffic classifier according to the following table.

        Only the S5720-EI, S6720-EI, and S6720S-EI support traffic classifiers with advanced ACLs containing the ttl-expired field.

        When a traffic classifier contains if-match ipv6 acl { acl-number | acl-name }, the S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-HI, S6730-H, S6730S-H, S6730-S, and S6730S-S do not support remark 8021p [ 8021p-value | inner-8021p ], remark cvlan-id cvlan-id, remark vlan-id vlan-id, or mac-address learning disable.

        On the S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, and S5735S-S, if a traffic policy is applied to the outbound direction and the relationship between rules in a traffic classifier is AND:
        • Rules for matching the source IPv6 address and those for matching destination IPv6 address cannot be configured in the same traffic classifier.
        • Rules for matching IPv6 information (for example, if-match protocol ipv6 and if-match ipv6 acl) and those for matching the source MAC address, destination MAC address, source IPv6 address, or destination IPv6 address of packets cannot be configured in the same traffic classifier. (ACL6 rules can be used to match the source or destination IPv6 address of packets.)
        • Rules for matching IPv4 information (IP address and UDP port number) and those for matching some Layer 2 information (for example, if-match source-mac, if-match destination-mac, and if-match l2-protocol { mpls | rarp | protocol-value }) cannot be configured in the same traffic classifier.

        Matching Rule

        Command

        Remarks

        Outer VLAN ID or inner and outer VLAN IDs of QinQ packets

        if-match vlan-id start-vlan-id [ to end-vlan-id ] [ cvlan-id cvlan-id ]

        Only the S5720-EI, S5720-HI, S5730-HI, S5730S-EI, S5730-SI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720-LI, S6720S-EI, S6720S-LI, S6720S-SI, S6720-SI, S6730-H, S6730S-H, S6730-S, and S6730S-S support the cvlan-id cvlan-id parameter.

        Inner and outer VLAN IDs in QinQ packets

        if-match cvlan-id start-vlan-id [ to end-vlan-id ] [ vlan-id vlan-id ]

        Only the S5720-EI, S5720-HI, S5730-HI, S5730S-EI, S5730-SI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720-LI, S6720S-EI, S6720S-LI, S6720S-SI, S6720-SI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this matching rule.

        802.1p priority in VLAN packets

        if-match 8021p 8021p-value &<1-8>

        If you specify multiple values for 8021p-value in one command, a packet matching any of the values matches the traffic classifier, regardless of whether the relationship between rules in the traffic classifier is AND or OR.

        Inner 802.1p priority in QinQ packets

        if-match cvlan-8021p 8021p-value &<1-8>

        Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this matching rule.

        Discarded packet

        if-match discard

        Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this matching rule.

        A traffic classifier containing this matching rule can only be bound to traffic behaviors containing the traffic statistics collection and flow mirroring actions.

        Double tags in QinQ packets

        if-match double-tag

        Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, S5735S-S, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this matching rule.

        EXP priority in MPLS packets

        if-match mpls-exp exp-value &<1-8>

        Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this matching rule.

        If you specify multiple values for exp-value in one command, a packet matching any of the values matches the traffic classifier, regardless of whether the relationship between rules in the traffic classifier is AND or OR.

        Destination MAC address

        if-match destination-mac mac-address [ mac-address-mask ]

        -

        Source MAC address

        if-match source-mac mac-address [ mac-address-mask ]

        -

        Protocol type in the Ethernet frame header

        if-match l2-protocol { arp | ip | mpls | rarp | protocol-value }

        -

        All packets

        if-match any

        After the if-match any command is run, only the matching rule configured using this command takes effect, and the other matching rules in the same traffic classifier will become ineffective.

        DSCP priority in IP packets

        if-match dscp dscp-value &<1-8>

        • If you specify multiple values for dscp-value in one command, a packet matching any of the values matches the traffic classifier, regardless of whether the relationship between rules in the traffic classifier is AND or OR.

        • The if-match dscp and if-match ip-precedence commands cannot be configured in the same traffic classifier in which the relationship between rules is AND.

        IP precedence in IP packets

        if-match ip-precedence ip-precedence-value &<1-8>

        • If you specify multiple values for ip-precedence-value in one command, a packet matching any of the values matches the traffic classifier, regardless of whether the relationship between rules in the traffic classifier is AND or OR.

        • The if-match dscp and if-match ip-precedence commands cannot be configured in the same traffic classifier in which the relationship between rules is AND.

        Layer 3 protocol type

        if-match protocol { ip | ipv6 }

        -

        SYN flag in the TCP packet

        if-match tcp syn-flag { syn-flag-value | ack | fin | psh | rst | syn | urg }

        -

        Inbound interface

        if-match inbound-interface interface-type interface-number

        A traffic policy containing this matching rule cannot be applied to the outbound direction or in the interface view.

        Outbound interface

        if-match outbound-interface interface-type interface-number

        The S2720-EI, S5720-LI, S5720S-LI, S5720-SI, S5720I-SI, S5720S-SI, S5730-SI, S5730S-EI, S6720-LI, S6720S-LI, S6720-SI, and S6720S-SI do not support this matching rule.

        A traffic policy containing this matching rule cannot be applied to the inbound direction on the S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735S-S, S5735-S-I, S6720-HI, S6730-H, S6730S-H, S6730-S, and S6730S-S.

        A traffic policy containing this matching rule cannot be applied in the interface view.

        ACL rule

        if-match acl { acl-number | acl-name }
        • Before specifying an ACL in a matching rule, configure the ACL.
        • If an ACL in a traffic classifier defines multiple rules and a packet matches any of the rules, the packet matches the ACL, regardless of whether the relationship between rules in the traffic classifier is AND or OR.
        • If the vpn-instance parameter is specified in an ACL rule, a traffic policy that defines a traffic classifier matching this ACL rule does not take effect.

        ACL6 rule

        if-match ipv6 acl { acl-number | acl-name }

        Before specifying an ACL6 in a matching rule, configure the ACL6.

        If the vpn-instance parameter is specified in an ACL6 rule, a traffic policy that defines a traffic classifier matching this ACL6 rule does not take effect.

        On the S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, and S5735S-S, if a traffic policy is applied to the outbound direction, and an ACL6 rule for matching the source IPv6 address of packets and an ACL6 rule for matching the destination IPv6 address of packets are respectively configured in two traffic classifiers:
        • If the traffic behaviors corresponding to the two traffic classifiers do not conflict, the two traffic classifiers and their corresponding traffic behaviors take effect.
        • If the traffic behaviors corresponding to the two traffic classifiers conflict, the traffic behavior and traffic classifier defining the ACL6 rule for matching the source IPv6 address of packets take effect.

        Flow ID

        if-match flow-id flow-id

        Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-S, S5731S-H, S5732-H, S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, S5735S-S, S6720-EI, S6720-HI, S6730-H, S6730S-H, S6730-S, S6730S-S, and S6720S-EI support matching of flow IDs.

        A traffic classifier containing if-match flow-id and a traffic behavior containing remark flow-id must be bound to different traffic policies.

        A traffic policy containing if-match flow-id can be only applied to an interface, a VLAN, a VLANIF interface or the system in the inbound direction.

        Inner information of VXLAN packets

        if-match vxlan [ transit ] vni vni-id

        Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this matching rule.

        A traffic policy containing this matching rule cannot be applied to the outbound direction.

        If a traffic classifier contains this matching rule, it supports only traffic behaviors of traffic policing, packet filtering, and traffic statistics collection.

        Application name

        if-match application name appname

        Only the S5730-HI, S6720-HI, S5731-H, S5731S-H, S5731-S, S5731S-S, S5732-H, S6730-H, S6730S-H, S6730-S, and S6730S-S support this matching rule.

        A traffic policy containing this matching rule can be applied only to the inbound direction.

      4. Run quit

        Exit from the traffic classifier view.

    2. Configure a traffic behavior.
      1. Run traffic behavior behavior-name

        A traffic behavior is created and the traffic behavior view is displayed.

      2. Run mac-address learning disable

        MAC address learning is disabled in the traffic behavior view.

        This command is supported only by the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S.

      3. Run quit

        Exit from the traffic behavior view.

      4. Run quit

        Exit from the system view.

    3. Configure a traffic policy.

      1. Run traffic policy policy-name [ match-order { auto | config } ]

        A traffic policy is created and the traffic policy view is displayed, or the view of an existing traffic policy is displayed. If you do not specify a matching order for traffic classifiers in the traffic policy, the default matching order config is used.

        After a traffic policy is applied, you cannot use the traffic policy command to modify the matching order of traffic classifiers in the traffic policy. To modify the matching order, delete the traffic policy, create a traffic policy, and then specify the matching order.

        When creating a traffic policy, you can specify the matching order of matching rules in the traffic policy. The matching order can be either the automatic order (auto) or configuration order (config):
        • If the automatic order is used, traffic classifiers are matched based on the priorities of their types. If the traffic policy is applied to the inbound direction on the S5720-EI, S6720-EI, or S6720S-EI, traffic classifiers based on the following information are matched in descending order of priority: Layer 2 and IPv4 Layer 3 information > advanced ACL6 > basic ACL6 > IPv4 Layer 3 information > Layer 2 information > user-defined ACL information. In other cases, traffic classifiers based on the following information are matched in descending order of priority: Layer 2 and IPv4 Layer 3 information > advanced ACL6 information > basic ACL6 information > Layer 2 information > IPv4 Layer 3 information > user-defined ACL information. If data traffic matches multiple traffic classifiers and the bound traffic behaviors conflict with each other, the traffic behavior corresponding to the highest priority rule takes effect.
        • If the configuration order is used, traffic classifiers are matched based on the sequence in which they are bound to traffic behaviors.

        If more than 128 ACL rules defining CAR are configured, a traffic policy must be applied to an interface, a VLAN, and the system in sequence in the outbound direction. In the preceding situation, if ACL rules need to be updated, delete the traffic policy from the interface, VLAN, and system and re-configure a traffic policy in sequence.

      2. Run classifier classifier-name behavior behavior-name

        A traffic behavior is bound to a traffic classifier in the traffic policy.

      3. Run quit

        Exit from the traffic policy view.

      4. Run quit

        Exit from the system view.

    4. Apply the traffic policy.
      • Applying a traffic policy to 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 traffic-policy policy-name { inbound | outbound }

          A traffic policy is applied to the interface.

          A traffic policy can be applied to only one direction on an interface, but a traffic policy can be applied to different directions on different interfaces. After a traffic policy is applied to an interface, the system performs traffic policing for all the incoming or outgoing packets that match traffic classification rules on the interface.

      • Applying a traffic policy to a VLAN

        1. Run system-view

          The system view is displayed.

        2. Run vlan vlan-id

          The VLAN view is displayed.

        3. Run traffic-policy policy-name { inbound | outbound }

          A traffic policy is applied to the VLAN.

          Only one traffic policy can be applied to a VLAN in the inbound or outbound direction.

          After a traffic policy is applied, the system performs traffic policing for the packets that belong to a VLAN and match traffic classification rules in the inbound or outbound direction.

      • Applying a traffic policy to the system

        1. Run system-view

          The system view is displayed.

        2. Run traffic-policy policy-name global { inbound | outbound } [ slot slot-id ]

          A traffic policy is applied to the system.

          Only one traffic policy can be applied to the system or slot in one direction. A traffic policy cannot be applied to the same direction in the system and slot simultaneously.

          In a stack, a traffic policy that is applied to the system takes effect on all the interfaces and VLANs of all the member switches in the stack. The system then performs traffic policing for all the incoming and outgoing packets that match traffic classification rules on all the member switches. A traffic policy that is applied to a specified slot takes effect on all the interfaces and VLANs of the member switch with the specified stack ID. The system then performs traffic policing for all the incoming and outgoing packets that match traffic classification rules on this member switch.

          On a standalone switch, a traffic policy that is applied to the system takes effect on all the interfaces and VLANs of the local switch. The system then performs traffic policing for all the incoming and outgoing packets that match traffic classification rules on the local switch. Traffic policies applied to the slot and system have the same functions.

Verifying the Configuration

  • Run the display traffic classifier user-defined [ classifier-name ] command to check the traffic classifier configuration on the switch.
  • Run the display traffic behavior user-defined [ behavior-name ] command to check the traffic behavior configuration on the switch.
  • Run the display traffic policy user-defined [ policy-name [ classifier classifier-name ] ] command to check the user-defined traffic policy configuration.
  • Run the display traffic-applied [ interface [ interface-type interface-number ] | vlan [ vlan-id ] ] { inbound | outbound } [ verbose ] command to check traffic actions and ACL rules associated with the system, a VLAN, or an interface.
  • Run the display traffic policy { interface [ interface-type interface-number ] | vlan [ vlan-id ] | global } [ inbound | outbound ] command to check the traffic policy configuration on the switch.
  • Run the display traffic-policy applied-record [ policy-name ] command to check the record of the specified traffic policy.
Parent Topic: Configuring MAC Address Tables
Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
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