Guidelines And Limitations For Configuring Mac Addresses; Default Settings For Layer 2 Switching - Cisco Nexus 7000 Series Configuration Manual

Configuring Layer 2 Switching

Guidelines and Limitations for Configuring MAC Addresses

MAC addresses have the following configuration guidelines and limitations:
MAC Address Table
M1 Line Cards
F1 Line Cards
F2 and F2e Line Cards
Note The F2 and F2e modules synchronize the MAC address tables for a VLAN across all Switch on Chips
(SoCs) present in a virtual device context (VDC) when a switch virtual interface (SVI) for the VLAN is
configured. Synchronizing the MAC address tables can reduce the number of MAC addresses supported
in a VDC to 16,000.
Beginning with NX-OS Release 6.0.1, the learning mode feature is supported. Learning mode has the following
configuration guidelines and limitations:
Line Cards
M1
F1
F2 and F2e
Note When you configure a static MAC address on a vPC switch, ensure to configure a corresponding static
MAC address on the other vPC switch. If you configure the static MAC address only on one of the vPC
switches, the other vPC switch will not learn the MAC address dynamically.

Default Settings for Layer 2 Switching

This table lists the default setting for Layer 2 switching parameters.
Classic Ethernet Classic Ethernet
(CE) (CE) Conversational
Nonconversational Learning Supported
Learning Supported
Yes NA
Yes Yes
Yes Yes
Cisco Nexus 7000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.x

Guidelines and Limitations for Configuring MAC Addresses

Age Group
128,000 entries
16,000 to 256,000 entries
16,000 to 192,000 entries
Fabric Path
Conversational
Learning
NA
Yes
Yes
Fabric Path
Nonconversational
Learning
NA
No
Yes, if the switch
virtual interface
(SVI) is configured.
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