Configuring MAC Address Limiting on Service Instances Bridge Domains and EVC Port Channels

The MAC Address Limiting on Service Instances, Bridge Domains, and EVC Port Channels feature addresses port security with service instances by providing the capability to control and filter MAC address learning behavior at the granularity of a per-service instance. When a violation requires a shutdown, only the customer who is assigned to a given service instance is affected and--not all customers who are using the port.

MAC address limiting is a type of MAC security and is also referred to as a MAC security component or element.

Finding Feature Information

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Prerequisites for MAC Address Limiting on Service Instances Bridge Domains and EVC Port Channels

  • An understanding of service instances and bridge domains.

  • An understanding of how port channels and EtherChannels work in a network.

Restrictions for MAC Address Limiting on Service Instances Bridge Domains and EVC Port Channels

MAC address limiting for service instances and bridge domains is configured under a service instance and is permitted only after the service instance is configured under a bridge domain. If a service instance is removed from a bridge domain, all the MAC address limiting commands under it are also removed. If a bridge domain is removed from a service instance, all the MAC address limiting commands are also removed.

The MAC Address on RSP1 port channel overlaps with the interface MAC address and the traffic is dropped from ports 1 to 8 when an interface module is placed on slot 4.

Information About MAC Address Limiting on Service Instances Bridge Domains and EVC Port Channels

Ethernet Virtual Circuits, Service Instances, and Bridge Domains

An Ethernet virtual circuit (EVC) as defined by the Metro Ethernet Forum is a port-level point-to-point or multipoint-to-multipoint Layer 2 circuit. It is an end-to-end representation of a single instance of a Layer 2 service being offered by a provider to a customer. An EVC embodies the different parameters on which the service is being offered. A service instance is the instantiation of an EVC on a given port.

Support for Ethernet bridging is an important Layer 2 service that is offered on a router as part of an EVC. Ethernet bridging enables the association of a bridge domain with a service instance.

For information about the Metro Ethernet Forum standards, see the “Standards” table in the “Additional References” section.

EVCs on Port Channels

An EtherChannel bundles individual Ethernet links into a single logical link that provides the aggregate bandwidth of up to eight physical links. The Ethernet Virtual Connection Services (EVCS) EtherChannel feature provides support for EtherChannels on service instances.


Note

The MAC Address Security on EVC Port Channel services is supported only on bridge domains over Ethernet and is not supported on xconnect services.

EVCS uses the concepts of EVCs and service instances.

Load balancing is done on an Ethernet flow point (EFP) basis where a number of EFPs exclusively pass traffic through member links.

MAC Security and MAC Addressing

MAC security is enabled on a service instance by configuring the mac security command. Various MAC security elements can be configured or removed regardless of whether the mac security command is presently configured, but these configurations become operational only when the mac security command is applied.

In this document, the term “secured service instance” is used to describe a service instance on which MAC security is configured. The MAC addresses on a service instance on which MAC security is configured are referred to as “secured MAC addresses.” Secured MAC addresses can be either statically configured (as a permit list) or dynamically learned.

MAC Address Permit List

A permit list is a set of MAC addresses that are permitted on a service instance. Permitted addresses permanently configured into the MAC address table of the service instance.

On a service instance that is a member of a bridge domain, the operator is permitted to configure one or more permitted MAC addresses.

For each permitted address, eligibility tests are performed and after the address passes these tests, it is either:

  • Programmed into the MAC address table of the bridge domain, if MAC security is enabled on the service instance or,

  • Stored in an area of memory referred to as “MAC table cache” if MAC security is not enabled on the service instance. When MAC security is enabled, the addresses from the MAC table cache are added to the MAC address table as secure addresses.

The eligibility tests performed when a user tries to add a MAC address to the permit list on a service instance are as follows:

  • If the address is already a denied address on the service instance, the configuration is rejected with an appropriate error message.

  • If the acceptance of this address would increase the secure address count on the service instance beyond the maximum number allowed, an attempt is made to make room by removing an existing address from the MAC address table. The only candidate for removal is a dynamically learned address on the service instance. If sufficient room cannot be made, the configuration is rejected. If the acceptance of this address would increase the secure address count on the bridge domain beyond the maximum number allowed, an attempt is made to make room by removing an existing address from the MAC address table. The only candidate for removal is a dynamically learned address on the service instance. If room cannot be made, the configuration is rejected.

  • If the address is already permitted on another service instance in the same bridge domain, one of the following actions occur:
    • If the conflicting service instance has MAC security configured, the configuration is rejected with an appropriate error message.
    • If the conflicting service instance does not have MAC security configured, the configuration is accepted silently. (If the operator attempts to enable MAC security on the conflicting service instance, that attempt fails.)

MAC Address Deny List

A deny list is a set of MAC addresses that are not permitted on a service instance. An attempt to learn a denied MAC address will fail. On a service instance that is a member of a bridge domain, the operator is permitted to configure one or more denied MAC addresses. The arrival of a frame with a source MAC address that is part of a deny list will trigger a violation response.

Before a denied address can be configured, the following test is performed:

  • If the address is already configured as a permitted address on the specific service instance or if the address has been learned and saved as a sticky address on the service instance, the configuration is rejected with an appropriate error message.

In all other cases, the configuration of the denied address is accepted. Typical cases include:

  • The address is configured as a permitted address on another service instance in the same bridge domain, or the address has been learned and saved as a sticky address on another service instance.

  • The address is present in the MAC table of the bridge domain as a dynamically learned address on the specific service instance and is deleted from the MAC table before the configuration is accepted.

MAC Address Limiting and Learning

An upper limit for the number of secured MAC addresses allowed on a bridge domain service instance can be configured. This limit includes addresses added as part of a permit list and dynamically learned MAC addresses.

Before an unknown MAC address is learned, a series of checks are run against a set of configured and operational constraints. If any of these checks fails, the address is not learned, and a configured violation response is triggered.

Static and Dynamic MAC Addresses

A static MAC address is specified as permitted on a service instance, by a mac security permit command. A dynamic MAC address is a source MAC address encountered by the service instance that is not present in the MAC table but is allowed into and learned by the MAC address table.

Dynamic MAC Address Learning

Dynamic MAC address learning occurs when the bridging data path encounters an ingress frame whose source address is not present in the MAC address table for the ingress secured service instance.

The MAC security component is responsible for permitting or denying the addition of the new source address into the MAC table. The following constraints apply:

  • If a MAC address is to be learned, a check is performed to determine whether the number of secured MAC addresses exceed the maximum number that are permitted to be learned on the individual service instance and on the bridge domain.

  • A check is performed to determine if the MAC address on an another service instance is learned on a secured service instance in the same bridge domain.

  • A check is performed to verify if the new dynamic MAC address is in a deny list.

MAC Address Limiting on Service Instances

The user can configure the maximum number of MAC addresses that can exist in the MAC table that is associated with a service instance. This number includes statically configured and dynamically learned (including sticky) addresses.

On a service instance that has MAC security enabled and that does not have the maximum number of MAC addresses configured, the number of addresses allowed is one. This means that if the service instance has an associated permit list, that permit list can have only one address, and no addresses are learned dynamically. If the service instance does not have an associated permit list, one MAC address may be learned dynamically.

MAC Address Limiting for Bridge Domains

An upper limit for the number of MAC addresses that can reside in the MAC address table of a bridge domain can be set. This is set independently of the upper limit of secured MAC addresses on the service instance. An attempted violation of this bridge domain MAC address limit will cause the MAC address learn attempt to fail, and the frame to be dropped.

If the bridge domain MAC address limit is not configured, then by default, the maximum number of MAC addresses allowed on a bridge domain is the maximum number that can be supported by that platform.

Relationship Between the MAC Address Limit on a Bridge Domain and on a Service Instance

You can specify the maximum count of MAC table entries on a bridge domain and on a service instance simultaneously. However, there are no restrictions on the count that is configured on the service instance.

The table below shows an example of an initial configuration where three service instances are configured on a bridge domain:

Table 1. Bridge-Domain and Service-Instance MAC Address Limit

Bridge-Domain / Service-Instance Number

MAC Address Limit

Bridge Domain 1000

20

Service Instance 1001

5

Service Instance 1002

10

Service Instance 1003

To be configured

If you wish to configure MAC security on service instance 1003, any value can be configured for the maximum count. For example: 


service instance 1003 ethernet
 bridge-domain 1
 mac security
 mac security maximum addresses 35


service instance 1003 ethernet
bridge-domain 1
mac limit maximum addresses 35

A MAC address limit of 35 is permitted, even though the total MAC address limit for the three service instances (5 + 10 + 35) would exceed the count (20) configured on the bridge domain. Note that during actual operation, the bridge domain limit of 20 is in effect. The dynamic secure address count cannot exceed the lowest count applicable, so it is not possible for service instance 1003 to learn 35 addresses.

MAC Move and MAC Locking

If a MAC address is present in the MAC address table for a service instance (for example, service instance 1) on which MAC security is configured, the same MAC address cannot be learned on another service instance (for example, service instance 2) in the same bridge domain.

If service instance 2 attempts to learn the same MAC address, the violation response configured on service instance 2 is triggered. If MAC security is not configured on service instance 2 and a violation response is not configured, the “shutdown” response sequence is triggered on service instance 2.

If MAC security is not enabled on service instance 1, the violation is not triggered. service instance 2 learns the MAC address and moves it from service instance 1.

For some platforms, MAC address moves are allowed but moves between secured service instances and nonsecured service instances cannot be detected.

For example, if you do not configure MAC security on service instance 2 because of a hardware limitation, a MAC move from secured service instance 1 to service instance 2 is accepted. Therefore, it is recommended that all service instances within the same bridge-domain be configured as secured service instances.

Violation Response Configuration

A violation response is a response to a MAC security violation or a failed attempt to dynamically learn a MAC address due to an address violation. MAC security violations are of two types:

Type 1 Violation --The address of the ingress frame cannot be dynamically learned due to a deny list, or because doing so would cause the maximum number of secure addresses to be exceeded .

Type 2 Violation --The address of the ingress frame cannot be dynamically learned because it is already “present” on another secured service instance .

There are three possible sets of actions that can be taken in response to a violation:

  1. Shutdown

    • The ingress frame is dropped.

    • The service instance on which the offending frame arrived is shut down.

    • The event and the response are logged to SYSLOG.

  2. Restrict

    • The ingress frame is dropped.

    • The event and the response are logged to SYSLOG.

  3. Protect

    • The ingress frame is dropped.


      Note

      The ingress frame is dropped silently, without sending any violation report to the SYSLOG.

If a violation response is not configured, the default response mode is shutdown. The violation response can be configured to protect or restrict mode. A “no” form of a violation response, sets the violation response to the default mode of shutdown.

You are allowed to configure the desired response for a Type 1 and Type 2 violations on a service instance. For a Type 1 violation on a bridge domain (that is, if the learn attempt conforms to the policy configured on the service instance, but violates the policy configured on the bridge domain), the response is always “Protect.” This is not configurable.

In Restrict mode, the violation report is sent to SYSLOG at level LOG_WARNING.

Support for the different types of violation responses depends on the capabilities of the platform. The desired violation response can be configured on the service instance. The configured violation response does not take effect unless and until MAC security is enabled using the mac security command.

MAC Address Aging Configuration

A specific time scheduler can be set to age out secured MAC addresses that are dynamically learned or statically configured on both service instances and bridge domains, thus freeing up unused addresses from the MAC address table for other active subscribers.

The set of rules applied to age out secured MAC addresses is called secure aging. By default, the entries in the MAC address table of a secured service instance are never aged out. This includes permitted addresses and dynamically learned addresses.

The mac security aging time aging-time command sets the aging time of the addresses in the MAC address table to <n > minutes. By default, this affects only dynamically learned (not including sticky) addresses--permitted addresses and sticky addresses are not affected by the application of this command.

By default, the aging time <n> configured via the mac security aging time aging-time command is an absolute time. That is, the age of the MAC address is measured from the instant that it was first encountered on the service instance. This interpretation can be modified by using the mac security aging time aging-time inactivity command, which specifies that the age <n> be measured from the instant that the MAC address was last encountered on the service instance.

The mac security aging static and mac security aging sticky commands specify that the mac security aging time aging-time command must be applicable to permitted and sticky MAC addresses, respectively. In the case of permitted MAC addresses, the absolute aging time is measured from the time the address is entered into the MAC address table (for example, when it is configured or whenever the mac security command is entered--whichever is later).

If the mac security aging time command is not configured, the mac security aging static command has no effect.

Sticky MAC Address Configurations

The ability to make dynamically learned MAC addresses on secured service instances permanent even after interface transitions or device reloads can be set up and configured. A dynamically learned MAC address that is made permanent on a secured service instance is called a “sticky MAC address”. The mac security sticky command is used to enable the sticky MAC addressing feature on a service instance.

With the “sticky” feature enabled on a secured service instance, MAC addresses learned dynamically on the service instance are kept persistent across service instance line transitions and device reloads.

The sticky feature has no effect on statically configured MAC addresses. The sticky addresses are saved in the running configuration. Before the device is reloaded, it is the responsibility of the user to save the running configuration to the startup configuration. Doing this will ensure that when the device comes on, all the MAC addresses learned dynamically previously are immediately populated into the MAC address table.

The mac security sticky address mac-address command can configure a specific MAC address as a sticky MAC address. The use of this command is not recommended for the user because configuring a MAC address as a static address does the same thing. When sticky MAC addressing is enabled by the mac security sticky command, the dynamically learned addresses are marked as sticky and a mac security sticky address mac-address command is automatically generated and saved in the running configuration for each learned MAC address on the service instances.

Aging for Sticky Addresses

MAC addresses learned on a service instance that has the sticky behavior enabled are subject to aging as configured by the mac security aging time and mac security aging sticky commands. In other words, for the purpose of aging functionality, sticky addresses are treated the same as dynamically learned addresses.

Transitions

This section contains a description of the expected behavior of the different MAC security elements when various triggers are applied; for example, configuration changes or link state transitions.

MAC Security Enabled on a Service Instance

When MAC security is enabled on a service instance, all existing MAC table entries for the service instance are purged. Then, permitted MAC address entries and sticky addresses are added to the MAC table, subject to the prevailing MAC address limiting constraints on the bridge domain.

If MAC address limits are exceeded, any MAC address that fails to get added is reported via an error message to the console, the attempt to enable MAC security on the service instance fails, and the already added permitted entries are backed out or removed.

The aging timer for all entries is updated according to the secure aging rules.

MAC Security Disabled on a Service Instance

The existing MAC address table entries for this service instance are purged.

Service Instance Moved to a New Bridge Domain

This transition sequence applies to all service instances, whether or not they have MAC security configured. All the MAC addresses on this service instance in the MAC address table of the old bridge domain are removed. The count of dynamically learned addresses in the old bridge domain is decremented. Then, all the MAC security commands are permanently erased from the service instance.

Service Instance Removed from a Bridge Domain

All the MAC addresses in the MAC address table that attributable to this service instance are removed, and the count of dynamically learned addresses in the bridge domain is decremented. Since MAC security is applicable only on service instances that are members of a bridge domain, removing a service instance from a bridge domain causes all the MAC security commands to be erased permanently.

Service Instance Shut Down Due to Violation

All dynamically learned MAC addresses in the MAC address table are removed, and all the other MAC security state values are left unchanged. The only change is that no traffic is forwarded, and therefore no learning can take place.

Interface Service Instance Down Linecard OIR Removed

The MAC tables of all the affected bridge domains are cleared of all the entries attributable to the service instances that are down.

Interface Service Instance Re-activated Linecard OIR Inserted

The static and sticky address entries in the MAC tables of the affected bridge domains are re-created to the service instances that are activated.

MAC Address Limit Decreased

When the value of the MAC address limit on the service instance is changed initially, a sanity check is performed to ensure that the new value of <n> is greater than or equal to the number of permitted entries. If not, the command is rejected. The MAC table is scanned for addresses that are attributable to this service instance, and dynamically learned MAC addresses are removed when the new MAC address limit is less than the old MAC address limit.

Sticky Addresses Added or Removed on a Service Instance

Existing dynamically learned MAC addresses remain unchanged. All new addresses learned become “sticky” addresses.

Disabling sticky addresses causes all sticky secure MAC addresses on the service instance to be removed from the MAC address table. All new addresses learned become dynamic addresses on the service instance and are subject to aging.

How to Configure MAC Address Limiting on Service Instances Bridge Domains and EVC Port Channels

Enabling MAC Security on a Service Instance

Perform this task to enable MAC address security on a service instance.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface type number
  4. service instance id ethernet
  5. encapsulation dot1q vlan-id
  6. bridge-domain bridge-id
  7. mac security
  8. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

interface type number

Example:


Device(config)# interface gigabitethernet2/0/1

Specifies the interface type and number, and enters interface configuration mode.

Step 4

service instance id ethernet

Example:


Device(config-if)# service instance 100 ethernet

Creates a service instance on an interface and enters service instance configuration mode.

Step 5

encapsulation dot1q vlan-id

Example:


Device(config-if-srv)# encapsulation dot1q 100

Defines the matching criteria to be used in order to map ingress dot1q frames on an interface to the appropriate service instance.

Step 6

bridge-domain bridge-id

Example:


Device(config-if-srv)# bridge-domain 200

Binds the service instance to a bridge- domain instance where bridge-id is the identifier for the bridge- domain instance.

Step 7

mac security

Example:


Device(config-if-srv)# mac security

Enables MAC security on the service instance.

Step 8

end

Example:


Device(config-if-srv)# end

Returns to user EXEC mode.

Enabling MAC Security on an EVC Port Channel

Before you begin


Note

  • Bridge-domain, xconnect, and Ethernet virtual circuits (EVCs) are allowed only over the port channel interface and the main interface.

  • If you configure a physical port as part of a channel group, you cannot configure EVCs under that physical port.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface port-channel channel-group
  4. service instance id ethernet
  5. encapsulation dot1q vlan-id
  6. bridge-domain bridge-id
  7. mac security
  8. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

interface port-channel channel-group

Example:


Device(config)# interface port-channel 2

Specifies the port channel group number and enters interface configuration mode.

  • Acceptable values are integers from 1 to 64.

Step 4

service instance id ethernet

Example:


Device(config-if)# service instance 100 ethernet

Creates a service instance on an interface and enters service instance configuration mode.

Step 5

encapsulation dot1q vlan-id

Example:


Device(config-if-srv)# encapsulation dot1q 100

Defines the matching criteria to be used in order to map ingress dot1q frames on an interface to the appropriate service instance.

Step 6

bridge-domain bridge-id

Example:


Device(config-if-srv)# bridge-domain 200

Binds the service instance to a bridge- domain instance where bridge-id is the identifier for the bridge- domain instance.

Step 7

mac security

Example:


Device(config-if-srv)# mac security

Enables MAC security on the service instance.

Step 8

end

Example:


Device(config-if-srv)# end

Returns to user EXEC mode.

Configuring a MAC Address Permit List

Perform this task to configure permitted MAC addresses on a service instance that is a member of a bridge domain.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface type number
  4. service instance id ethernet
  5. encapsulation dot1q vlan-id
  6. bridge-domain bridge-id
  7. mac security address permit mac-address
  8. mac security address permit mac-address
  9. mac security address permit mac-address
  10. mac security address permit mac-address
  11. mac security address permit mac-address
  12. mac security
  13. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

interface type number

Example:


Device(config)# interface gigabitethernet2/0/1

Specifies the interface type and number, and enters interface configuration mode.

Step 4

service instance id ethernet

Example:


Device(config-if)# service instance 100 ethernet

Creates a service instance (an instance of an EVC) on an interface and enters service instance configuration mode.

Step 5

encapsulation dot1q vlan-id

Example:


Device(config-if-srv)# encapsulation dot1q 100

Defines the matching criteria to be used for mapping ingress dot1q frames on an interface to the appropriate service instance.

Step 6

bridge-domain bridge-id

Example:


Device(config-if-srv)# bridge-domain 200

Binds the service instance to a bridge- domain instance where bridge-id is the identifier for the bridge- domain instance.

Step 7

mac security address permit mac-address

Example:


Device(config-if-srv)# mac security address permit a2aa.aaaa.aaaa

Adds the specified MAC address as a permit MAC address for the service instance.

Step 8

mac security address permit mac-address

Example:


Device(config-if-srv)# mac security address permit a2aa.aaaa.aaab

Adds the specified MAC address as a permitted MAC address for the service instance.

Step 9

mac security address permit mac-address

Example:


Device(config-if-srv)# mac security address permit a2aa.aaaa.aaac

Adds the specified MAC address as a permitted MAC address for the service instance.

Step 10

mac security address permit mac-address

Example:


Device(config-if-srv)# mac security address permit a2aa.aaaa.aaad

Adds the specified MAC address as a permitted MAC address for the service instance.

Step 11

mac security address permit mac-address

Example:


Device(config-if-srv)# mac security address permit a2aa.aaaa.aaae

Adds the specified MAC address as a permitted MAC address for the service instance.

Step 12

mac security

Example:


Device(config-if-srv)# mac security

Enables MAC security on the service instance.

Step 13

end

Example:


Device(config-if-srv)# end

Returns to user EXEC mode.

Configuring a MAC Address Deny List

Perform this task to configure a list of MAC addresses that are not allowed on a service instance that is a member of a bridge domain.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface type number
  4. service instance id ethernet
  5. encapsulation dot1q vlan-id
  6. bridge-domain bridge-id
  7. mac security address deny mac-address
  8. mac security address deny mac-address
  9. mac security address deny mac-address
  10. mac security address deny mac-address
  11. mac security address deny mac-address
  12. mac security
  13. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

interface type number

Example:


Device(config)# interface gigabitethernet2/0/1

Specifies the interface type and number, and enters interface configuration mode.

Step 4

service instance id ethernet

Example:


Device(config-if)# service instance 100 ethernet

Creates a service instance (an instance of an EVC) on an interface and enters service instance configuration mode.

Step 5

encapsulation dot1q vlan-id

Example:


Device(config-if-srv)# encapsulation dot1q 100

Defines the matching criteria to be used in order to map ingress dot1q frames on an interface to the appropriate service instance.

Step 6

bridge-domain bridge-id

Example:


Device(config-if-srv)# bridge-domain 200

Binds the service instance to a bridge- domain instance where bridge-id is the identifier for the bridge- domain instance.

Step 7

mac security address deny mac-address

Example:


Device(config-if-srv)# mac security address deny a2aa.aaaa.aaaa

Adds the specified MAC address as a denied MAC address for the service instance.

Step 8

mac security address deny mac-address

Example:


Device(config-if-srv)# mac security address deny a2aa.aaaa.aaab

Adds the specified MAC address as a denied MAC address for the service instance.

Step 9

mac security address deny mac-address

Example:


Device(config-if-srv)# mac security address deny a2aa.aaaa.aaac

Adds the specified MAC address as a denied MAC address for the service instance.

Step 10

mac security address deny mac-address

Example:


Device(config-if-srv)# mac security address deny a2aa.aaaa.aaad

Adds the specified MAC address as a denied MAC address for the service instance.

Step 11

mac security address deny mac-address

Example:


Device(config-if-srv)# mac security address deny a2aa.aaaa.aaae

Adds the specified MAC address as a denied MAC address for the service instance.

Step 12

mac security

Example:


Device(config-if-srv)# mac security

Enables MAC security on the service instance.

Step 13

end

Example:


Device(config-if-srv)# end

Returns to user EXEC mode.

Configuring MAC Address Limiting on a Bridge Domain

Perform this task to configure an upper limit for the number of secured MAC addresses that reside in a bridge domain.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. bridge-domain bridge-id
  4. mac limit maximum addresses maximum-addresses
  5. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

bridge-domain bridge-id

Example:


Device(config)# bridge-domain 100

Configures components on a bridge domain and enters bridge-domain configuration mode.

Step 4

mac limit maximum addresses maximum-addresses

Example:


Device(config-bdomain)# mac limit maximum addresses 200

Sets the MAC limit maximum addresses.

Step 5

end

Example:


Device(config-bdomain)# end

Returns to user EXEC mode.

Configuring MAC Address Limiting on a Service Instance

Perform this task to configure an upper limit for the number of secured MAC addresses allowed on a service instance. This number includes addresses added as part of a permit list as well as dynamically learned MAC addresses. If the upper limit is decreased, all learned MAC entries are removed.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface type number
  4. service instance id ethernet
  5. encapsulation dot1q vlan-id
  6. bridge-domain bridge-id
  7. mac security maximum addresses
  8. mac limit maximum addresses maximum-addresses
  9. mac security
  10. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

interface type number

Example:


Device(config)# interface gigabitethernet2/0/1

Specifies the interface type and number, and enters interface configuration mode.

Step 4

service instance id ethernet

Example:


Device(config-if)# service instance 100 ethernet

Creates a service instance (an instance of an EVC) on an interface and enters service instance configuration mode.

Step 5

encapsulation dot1q vlan-id

Example:


Device(config-if-srv)# encapsulation dot1q 100

Defines the matching criteria to be used to map ingress dot1q frames on an interface to the appropriate service instance.

Step 6

bridge-domain bridge-id

Example:


Device(config-if-srv)# bridge-domain 200

Binds the service instance to a bridge- domain instance where bridge-id is the identifier for the bridge- domain instance.

Step 7

mac security maximum addresses

Example:


Device(config-if-srv)# mac security maximum addresses 500

Sets the maximum number of secure addresses permitted on the service instance.

Step 8

mac limit maximum addresses maximum-addresses

Example:


Device(config-if-srv)# mac limit maximum address maximum-address

Sets the maximum number of secure addresses permitted on the service instance.

Step 9

mac security

Example:


Device(config-if-srv)# mac security

Enables MAC security on the service instance.

Step 10

end

Example:


Device(config-if-srv)# end

Returns to user EXEC mode.

Configuring a MAC Address Violation

Perform this task to specify the expected behavior of a device when an attempt to dynamically learn a MAC address fails because the configured MAC security policy on the service instance was violated.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface type number
  4. service instance id ethernet
  5. encapsulation dot1q vlan-id
  6. bridge-domain bridge-id
  7. Do one of the following:
    • mac security violation restrict
    • mac security violation protect
  8. mac security
  9. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

interface type number

Example:


Device(config)# interface gigabitethernet2/0/1

Specifies the interface type and number, and enters interface configuration mode.

Step 4

service instance id ethernet

Example:


Device(config-if)# service instance 100 ethernet

Creates a service instance (an instance of an EVC) on an interface and enters service instance configuration mode.

Step 5

encapsulation dot1q vlan-id

Example:


Device(config-if-srv)# encapsulation dot1q 100

Defines the matching criteria to be used to map ingress dot1q frames on an interface to the appropriate service instance.

Step 6

bridge-domain bridge-id

Example:


Device(config-if-srv)# bridge-domain 100

Binds the service instance to a bridge- domain instance where bridge-id is the identifier for the bridge- domain instance.

Step 7

Do one of the following:

  • mac security violation restrict
  • mac security violation protect

Example:


Device(config-if-srv)# mac security violation restrict

Example:


Device(config-if-srv)# mac security violation protect

Sets the violation mode (for Type 1 and 2 violations) to restrict.

or

Sets the violation mode (for Type 1 and 2 violations) to protect.

  • If a MAC security violation response is not specified, by default, the violation mode is shutdown.

Step 8

mac security

Example:


Device(config-if-srv)# mac security

Enables MAC security on the service instance.

Step 9

end

Example:


Device(config-if-srv)# end

Returns to user EXEC mode.

Configuring MAC Address Aging

Perform this task to configure the aging of secured MAC addresses under MAC security. Secured MAC addresses are not subject to the normal aging of MAC table entries. If aging is not configured, secured MAC addresses are never aged out.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface type number
  4. service instance id ethernet
  5. encapsulation dot1q vlan-id
  6. bridge-domain bridge-id
  7. mac security aging time aging-time [ inactivity ]
  8. mac security
  9. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

interface type number

Example:


Device(config)# interface gigabitethernet2/0/1

Specifies the interface type and number, and enters interface configuration mode.

Step 4

service instance id ethernet

Example:


Device(config-if)# service instance 100 ethernet

Creates a service instance (an instance of an EVC) on an interface and enters service instance configuration mode.

Step 5

encapsulation dot1q vlan-id

Example:


Device(config-if-srv)# encapsulation dot1q 100

Defines the matching criteria to be used in order to map ingress dot1q frames on an interface to the appropriate service instance.

Step 6

bridge-domain bridge-id

Example:


Device(config-if-srv)# bridge-domain 200

Binds the service instance to a bridge- domain instance where bridge-id is the identifier for the bridge- domain instance.

Step 7

mac security aging time aging-time [ inactivity ]

Example:


Device(config-if-srv)# mac security aging time 200 inactivity

Sets the aging time for secure addresses, in minutes. The optional inactivity keyword specifies that the aging out of addresses is based on inactivity of the sending hosts (as opposed to absolute aging).

Step 8

mac security

Example:


Device(config-if-srv)# mac security

Enables MAC security on the service instance.

Step 9

end

Example:


Device(config-if-srv)# end

Returns to user EXEC mode.

Configuring a Sticky MAC Address

If sticky MAC addressing is configured on a secured service instance, MAC addresses that are learned dynamically on the service instance are retained during a link-down condition. Perform this task to configure sticky MAC addresses on a service instance.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface type number
  4. service instance id ethernet
  5. encapsulation dot1q vlan-id
  6. bridge-domain bridge-id
  7. mac security sticky address mac-address
  8. mac security
  9. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

interface type number

Example:


Device(config)# interface gigabitethernet2/0/1

Specifies the interface type and number, and enters interface configuration mode.

Step 4

service instance id ethernet

Example:


Device(config-if)# service instance 100 ethernet

Creates a service instance (an instance of an EVC) on an interface and enters service instance configuration mode.

Step 5

encapsulation dot1q vlan-id

Example:


Device(config-if-srv)# encapsulation dot1q 100

Defines the matching criteria to be used to map ingress dot1q frames on an interface to the appropriate service instance.

Step 6

bridge-domain bridge-id

Example:


Device(config-if-srv)# bridge-domain 200

Binds the service instance to a bridge- domain instance where bridge-id is the identifier for the bridge- domain instance.

Step 7

mac security sticky address mac-address

Example:


Device(config-if-srv)# mac security sticky address 1111.2222.3333

Sets up a MAC address to be declared as a sticky MAC address on the service instance.

Step 8

mac security

Example:


Device(config-if-srv)# mac security

Enables MAC security on the service instance.

Step 9

end

Example:


Device(config-if-srv)# end

Returns to user EXEC mode.

Displaying the MAC Security Status of a Specific Service Instance

Perform this task to display the MAC security status of a service instance.

SUMMARY STEPS

  1. enable
  2. show ethernet service instance id id interface type number mac security
  3. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

show ethernet service instance id id interface type number mac security

Example:


Device# show ethernet service instance id 100 interface gigabitethernet1/1 mac security

Displays the MAC security status of a specific service instance.

Step 3

end

Example:


Device# end

Returns to user EXEC mode.

Displaying the Service Instances with MAC Security Enabled

Perform this task to display all the service instances with MAC security enabled.

SUMMARY STEPS

  1. enable
  2. show ethernet service instance mac security
  3. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

show ethernet service instance mac security

Example:


Device# show ethernet service instance mac security

Displays all the service instances with MAC security enabled.

Step 3

end

Example:


Device# end

Returns to user EXEC mode.

Displaying the Service Instances with MAC Security Enabled on a Specific Bridge Domain

Perform this task to display the service instances on a specific bridge domain that have MAC security enabled.

SUMMARY STEPS

  1. enable
  2. show bridge-domain id mac security
  3. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

show bridge-domain id mac security

Example:


Device# show bridge-domain 100 mac security

Displays all the service instances with MAC security enabled on a specific bridge domain.

Step 3

end

Example:


Device# end

Returns to user EXEC mode.

Showing the MAC Addresses of All Secured Service Instances

SUMMARY STEPS

  1. enable
  2. show ethernet service instance mac security address
  3. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

show ethernet service instance mac security address

Example:


Device# show ethernet service instance mac security address

Displays the secured addresses on all the service instances.

Step 3

end

Example:


Device# end

Returns to user EXEC mode.

Showing the MAC Addresses of a Specific Service Instance

SUMMARY STEPS

  1. enable
  2. show ethernet service instance id id interface type number mac security address
  3. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

show ethernet service instance id id interface type number mac security address

Example:


Device# show ethernet service instance id 200 interface GigabitEthernet 1/0 mac security address

Displays the addresses of a specific service instance.

Step 3

end

Example:


Device# end

Returns to user EXEC mode.

Showing the MAC Addresses of All Service Instances on a Specific Bridge Domain

SUMMARY STEPS

  1. enable
  2. show bridge-domain id mac security address
  3. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

show bridge-domain id mac security address

Example:


Device# show bridge-domain 100 mac security address

Displays the secured addresses of all the service instances on a specified bridge domain.

Step 3

end

Example:


Device# end

Returns to user EXEC mode.

Showing the MAC Security Statistics of a Specific Service Instance

This section describes how to display the MAC security statistics of a specific service instance.

SUMMARY STEPS

  1. enable
  2. show ethernet service instance id id interface type number mac security statistics
  3. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

show ethernet service instance id id interface type number mac security statistics

Example:


Device# show ethernet service instance id 100 interface gigabitethernet1/1 mac security statistics

Displays the MAC security statistics of a specific service instance.

Step 3

end

Example:


Device# end

Returns to user EXEC mode.

Showing the MAC Security Statistics of All Service Instances on a Specific Bridge Domain

Perform this task to display the MAC security statistics of all the service instances on a specific bridge domain.

SUMMARY STEPS

  1. enable
  2. show bridge-domain bridge-id mac security statistics
  3. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

show bridge-domain bridge-id mac security statistics

Example:


Device# show bridge-domain 100 mac security statistics

Displays the MAC security statistics of all service instances that belong to a specific bridge domain.

Step 3

end

Example:


Device# end

Returns to user EXEC mode.

Showing the Last Violation Recorded on Each Service Instance on a Specific Bridge Domain

Perform this task to display the last violation recorded on each service instance on a specific bridge domain. Service instances on which there have been no violations are excluded from the output.

SUMMARY STEPS

  1. enable
  2. show bridge-domain bridge-id mac security last violation
  3. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

show bridge-domain bridge-id mac security last violation

Example:


Device# show bridge-domain 100 mac security last violation

Displays information about the last violation recorded on each of the service instances that belong to the bridge domain.

Step 3

end

Example:


Device# end

Returns to user EXEC mode.

Clearing All Dynamically Learned Secure MAC Addresses on a Service Instance

Perform this task to clear all dynamically learned Secure MAC addresses on a service instance.

SUMMARY STEPS

  1. enable
  2. clear ethernet service instance id id interface type number mac table
  3. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

clear ethernet service instance id id interface type number mac table

Example:


Device# clear ethernet service instance id 100 interface gigabitethernet0/0/1 mac table

Clears all the dynamically learned Secure MAC addresses on the specified service instance.

Step 3

end

Example:


Device# end

Returns to user EXEC mode.

Clearing All Dynamically Learned MAC Addresses on a Bridge Domain

Perform this task to clear all dynamically learned MAC addresses on a bridge domain.

SUMMARY STEPS

  1. enable
  2. clear bridge-domain bridge-id mac table
  3. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

clear bridge-domain bridge-id mac table

Example:


Device# clear bridge-domain 100 mac table

Clears all dynamically learned MAC addresses on the specified bridge domain.

Step 3

end

Example:


Device# end

Returns to user EXEC mode.

Bringing a Specific Service Instance Out of the Error-Disabled State

Perform this task to bring a specific service instance out of the error-disabled state.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface type number
  4. service instance id ethernet
  5. encapsulation dot1q vlan-id
  6. bridge-domain bridge-id
  7. mac security
  8. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

interface type number

Example:


Device(config)# interface gigabitethernet2/0/1

Specifies the interface type and number, and enters interface configuration mode.

Step 4

service instance id ethernet

Example:


Device(config-if)# service instance 100 ethernet

Creates a service instance (an instance of an EVC) on an interface and enters service instance configuration mode.

Step 5

encapsulation dot1q vlan-id

Example:


Device(config-if-srv)# encapsulation dot1q 100

Defines the matching criteria to be used to map ingress dot1q frames on an interface to the appropriate service instance.

Step 6

bridge-domain bridge-id

Example:


Device(config-if-srv)# bridge-domain 200

Binds the service instance to a bridge-domain instance where bridge-id is the identifier for the bridge-domain instance.

Step 7

mac security

Example:


Device(config-if-srv)# mac security

Enables MAC security on the service instance.

Step 8

end

Example:


Device(config-if-srv)# end

Returns to user EXEC mode.

Configuration Examples for MAC Address Limiting on Service Instances and Bridge Domains and EVC Port Channels

Example Enabling MAC Security on a Service Instance

The following example shows how to enable MAC security on a service instance: 


Device> enable
Device# configure terminal
Device(config)# interface gigabitethernet 3/0/1
Device(config-if)# service instance 100 ethernet
Device(config-if-srv)# encapsulation dot1Q 100
Device(config-if-srv)# bridge-domain 100
Device(config-if-srv)# mac security
Device(config-if-srv)# end

Example Enabling MAC Security on an EVC Port Channel

The following example shows how to enable MAC Security on an EVC port channel: 


Device> enable
Device# configure terminal
Device(config)# interface port-channel 2
Device(config-if)# service instance 100 ethernet
Device(config-if-srv)# encapsulation dot1Q 100
Device(config-if-srv)# bridge-domain 100
Device(config-if-srv)# mac security
Device(config-if-srv)# end

Example Configuring a MAC Address Permit List

The following example shows how to configure a MAC address permit list:

Example Configuring a MAC Address Deny List

The following example shows how to configure a MAC address deny list: 


Device> enable
Device# configure terminal
Device(config)# interface gigabitethernet 3/0/1
Device(config-if)# service instance 100 ethernet
Device(config-if-srv)# encapsulation dot1Q 100
Device(config-if-srv)# bridge-domain 100
Device(config-if-srv)# mac security address deny a2aa.aaaa.aaaa
Device(config-if-srv)# mac security address deny a2aa.aaaa.aaab
Device(config-if-srv)# mac security address deny a2aa.aaaa.aaac
Device(config-if-srv)# mac security address deny a2aa.aaaa.aaad
Device(config-if-srv)# mac security address deny a2aa.aaaa.aaae
Device(config-if-srv)# mac security
Device(config-if-srv)# end

Example Configuring MAC Address Limiting on a Bridge Domain


Device> enable
Device# configure terminal
Device(config)# bridge-domain 100
Device(config-bdomain)# mac limit maximum addresses 1000
Device(config-bdomain)# end

Example Configuring a MAC Address Limit on a Service Instance 


Device> enable
Device# configure terminal
Device(config)# interface gigabitethernet 3/0/1
Device(config-if)# service instance 100 ethernet
Device(config-if-srv)# encapsulation dot1Q 100
Device(config-if-srv)# bridge-domain 100
Device(config-if-srv)# mac security maximum addresses 10
Device(config-if-srv)# mac security
Device(config-if-srv)# end


Device> enable
Device# configure terminal
Device(config)# interface gigabitethernet 3/0/1
Device(config-if)# service instance 100 ethernet
Device(config-if-srv)# encapsulation dot1Q 100
Device(config-if-srv)# bridge-domain 100
Device(config-if-srv)# mac limit maximum addresses 10
Device(config-if-srv)# end

Example Configuring a MAC Address Violation Response


Device> enable
Device# configure terminal
Device(config)# interface gigabitethernet 3/0/1
Device(config-if)# service instance 100 ethernet
Device(config-if-srv)# encapsulation dot1Q 100
Device(config-if-srv)# bridge-domain 100
Device(config-if-srv)# mac security address permit a2aa.aaaa.aaaa
Device(config-if-srv)# mac security violation protect
Device(config-if-srv)# mac security
Device(config-if-srv)# end

Example Configuring MAC Address Aging


Device> enable
Device# configure terminal
Device(config)# interface gigabitethernet 4/0/1
Device(config-if)# service instance 100 ethernet
Device(config-if-srv)# encapsulation dot1q 100
Device(config-if-srv)# bridge-domain 100
Device(config-if-srv)# mac security aging time 10
Device(config-if-srv)# mac security
Device(config-if-srv)# end

Example Configuring a Sticky MAC Address


Device> enable
Device# configure terminal
Device(config)# interface gigabitethernet 3/0/1
Device(config-if)# service instance 100 ethernet
Device(config-if-srv)# encapsulation dot1Q 100
Device(config-if-srv)# bridge-domain 100
Device(config-if-srv)# mac security sticky address 1111.2222.3333
Device(config-if-srv)# mac security

Example Displaying the MAC Addresses on a Specific Secure Service Instance

Example Displaying the Last Violation on a Specific Service Instance

Example Displaying the MAC Security Status of a Specific Service Instance

Example Displaying the MAC Addresses of All Secured Service Instances

Example Displaying the MAC Security Statistics of All Service Instances

In the following example, the numbers of allowed and actual secured addresses recorded on the service instance are displayed.

Example: Displaying the MAC Addresses on All Service Instances for a Bridge Domain

Example Displaying the Secured Service Instances for a Specific Bridge Domain

Additional References

Related Documents

Related Topic

Document Title

CFM commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples

Cisco IOS Carrier Ethernet Command Reference

Cisco IOS commands: master list of commands with complete command syntax, command mode, command history, defaults, usage guidelines, and examples

Cisco IOS Master Command List, All Releases

Configuring Ethernet connectivity fault management in a service provider network (Cisco pre-Standard CFM Draft 1)

"Configuring Ethernet Connectivity Fault Management in a Service Provider Network” module in the Cisco IOS Carrier Ethernet Configuration Guide

Ethernet Local Management Interface on a provider edge device

"Configuring Ethernet Local Management Interface on a Provider Edge Device” module in the Cisco IOS Carrier Ethernet Configuration Guide

IP SLAs for Metro Ethernet

"IP SLAs for Metro Ethernet"

NSF/SSO and MPLS

"NSF/SSO - MPLS LDP and LDP Graceful Restart"

ISSU feature and functions

"Cisco IOS Broadband High Availability In Service Software Upgrade"

Performing an ISSU

"Cisco IOS In Service Software Upgrade Process and Enhanced Fast Software Upgrade Process"

SSO

“Stateful Switchover” chapter of the Cisco IOS High Availability Configuration Guide

Standards

Standard

Title

IEEE 802.1ag Standard

802.1ag - Connectivity Fault Management

IEEE 802.3ah

IEEE 802.3ah Ethernet in the First Mile

IETF VPLS OAM

L2VPN OAM Requirements and Framework

ITU-T

ITU-T Y.1731 OAM Mechanisms for Ethernet-Based Networks

MIBs

MIB

MIBs Link

CISCO-ETHER-CFM-MIB

To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

RFCs

RFC

Title

No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified.

--

Technical Assistance

Description

Link

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html

Feature Information for MAC Address Limiting on Service Instances Bridge Domains and EVC Port Channels

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Table 2. Feature Information for MAC Address Limiting on Service Instances, Bridge Domains, and EVC Port Channels

Feature Name

Releases

Feature Information

MAC Address Limiting on Service Instances and Bridge Domains

Cisco IOS XE 3.7S

The MAC Address Limiting on Service Instances and Bridge Domains feature addresses port security with service instances by providing the capability to control and filter MAC address learning behavior at the granularity of a per-service instance. When a violation requires a shutdown, only the customer that is assigned to a given service instance is affected. MAC address limiting is a type of MAC security and is also referred to as a MAC security component or element.

The following commands were introduced or modified: bridge-domain (global) , bridge-domain (service instance) , clear bridge-domain mac-table , clear ethernet service instance , errdisable recovery cause mac-security , interface , mac limit maximum addresses , security ,show bridge-domain , show ethernet service instance .