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Understanding MAC Address Assignment in an EX Series Switch This topic describes MAC address assignment for interfaces on standalone Juniper Networks EX Series Ethernet Switches. For information regarding MAC address assignments in a, see. MAC addresses are used to identify network devices at Layer 2. Because all Layer 2 traffic decisions are based on an interface’s MAC address, understanding MAC address assignment is important to understanding how network traffic is forwarded and received by the switch.
For additional information on how a network uses MAC addresses to forward and receive traffic, see. A MAC address comprises six groups of two hexadecimal digits, with each group separated from the next group by a colon—for instance, aa:bb:cc:dd:ee:00. The first five groups of hexadecimal digits are derived from the switch and are the same for all interfaces on the switch. The assignment of a unique MAC address to each network interface helps ensure that functions that require MAC address differentiation—such as redundant trunk groups (RTGs), Link Aggregation Control Protocol (LACP), and general monitoring functions—can properly function. On switches that use line cards, this MAC addressing scheme differentiates the Layer 2 interfaces on different line cards in the switch. For EX Series switches, the first five groups of hexadecimal digits are determined when the switch is manufactured. The switch then assigns a unique MAC address to each interface by assigning a unique identifier as the last group of hexadecimal digits.
The assignment depends on how the interface is configured. The switch uses a different pattern to distinguish between an interface that is configured as any of a ( ), a virtual management Ethernet (VME) interface, or an aggregated Ethernet interface or is not configured as any of an RVI, a VME, or as an aggregated Ethernet interface. For aggregated Ethernet interfaces, the MAC address assignment remains constant regardless of whether the configuration of the interface is Layer 2 or Layer 3. Note: Prior to Junos OS Release 11.3, MAC addresses for Layer 2 interfaces could be shared between interfaces and RVIs on different line cards in the same switch. However, if you upgrade from Junos OS Release 11.2 or earlier to Junos OS Release 11.3 or later on a switch that supports line cards, the MAC addresses of these interfaces will change.
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MAC addresses are assigned to interfaces automatically—no user configuration is possible or required. You can view MAC addresses assigned to interfaces using the show interfaces command.
Show chassis mac-addresses Release Information Command introduced before JUNOS Release 7.4. Command introduced in JUNOS Release 9.0 for EX Series switches.
Sfc option introduced for the TX Matrix Plus router in JUNOS Release 9.6. Command introduced in Junos OS Release 11.1 for QFX Series.
Command introduced in Junos OS Release 12.2 for ACX Series Universal Access Routers. Command introduced in Junos OS Release 12.3 for MX2020 3D Universal Edge Routers. Command introduced in Junos OS Release 12.3 for MX2010 3D Universal Edge Routers. Command introduced in Junos OS Release 15.1X54-D20 for ACX5048 and ACX5096 Routers. Command introduced in Junos OS Release 17.2 for MX2008 3D Universal Edge Routers. Command introduced in Junos OS Release 17.2 for PTX10008 Routers. Command introduced in Junos OS Release 17.3 for MX10003 3D Universal Edge Routers.