Cisco ASR 9000 Series Command Reference

duplicate-mac-allowed
To allow duplicate client MAC addresses across different VLANs and interfaces, use the
duplicate-mac-allowed command in the DHCP IPv4 configuration mode. To disallow duplicate client MAC
addresses, use the no form of this command.
duplicate-mac-allowed exclude-vlan
no duplicate-mac-allowed
Syntax Description
Excludes VLANs from the client key; only MAC
address and interface form the client key.
exclude-vlan
Command Default
By default, duplicate MAC address support is disabled.
Command Modes
DHCP IPv4 configuration
Command History
ModificationRelease
This command was introduced in
BNG, with an addition of
exclude-vlan option to exclude
VLANs from the client key.
Release 6.1.2
This command was introduced.Release 4.3.2
Usage Guidelines
You can enable duplicate MAC addresses on relay, proxy, server, and snoop DHCP modes.
Do not enable the duplicate-mac-allowed command for mobile subscribers.
With exclude-vlan option enabled, both inner and outer VLANs get excluded. You cannot exclude just one
of them.
Task ID
OperationTask ID
read, writeip-services
Cisco ASR 9000 Series Aggregation Services Router Broadband Network Gateway Command Reference,
Release 5.2.x
156
BNG DHCP Commands
duplicate-mac-allowed

Cisco ASR 9000 Series Specifications

General

Series	ASR 9000
Category	Network Router
Modular Design	Yes
Redundancy	Yes (Hardware and Software)
Operating System	Cisco IOS XR
Interfaces/Ports	10G, 40G, 100G, 400G Ethernet
Expansion Slots	Varies by model
Routing Protocol	BGP, OSPF, IS-IS, EIGRP
Management	CLI, SNMP, NETCONF
Power Supply	Redundant
Port Density	Varies by model
Power Supply Options	AC, DC
Memory	Varies by model
Storage	Varies by model
Dimensions	Varies by model
Weight	Varies by model