![]() ![]() The range is from 120 to 918000 the default is 1800 seconds. Specifies the time before an entry ages out and is discarded from the Layer 2 MAC address table. Mac address-table aging-time seconds Įxample: switch(config)# mac address-table aging-time 600 (Optional) copy running-config startup-config (Optional) show mac address-table aging-timeĥ. Show interface Įxample: switch# show interface ethernet 7/3ĭisplays information about the Layer 3 interface.īefore you configure the aging time for the MAC table, ensure that you are in the correct VDC (or enter the switchto vdc command).Ģ. Specified a static MAC address to add to the Layer 3 interface. You must create the Layer 3 interface before you can assign the static MAC address.Įxample: switch(config-if)# mac-address 89 Specifies the Layer 3 interface and enters the interface configuration mode. Interface Įxample: switch(config)# interface ethernet 7/3 Specifies a static MAC address to add to the Layer 2 MAC address table.Įxample: switch# show mac address-table staticĮxample: switch# copy running-config startup-configĬopies the running configuration to the startup configuration.Ģ. mac address-table static mac-address vlan vlan-id Įxample: switch(config)# mac-address-table static 1.1.1 vlan 2 interface ethernet 1/2 The device uses an aging mechanism, defined by a configurable aging timer, so if an address remains inactive for a specified number of seconds, it is removed from the address table.īefore you configure static MAC addresses, ensure that you are in the correct VDC (or enter the switchto vdc command).Ģ. The address table can store up to 128,000 address entries. The MAC address table display is enhanced to display information on MAC addresses when you are using vPCs. The static MAC entries are retained across a reboot of the device.īeginning with Cisco NX-OS Release 4.1(5), you must manually configure identical static MAC addresses on both devices connected by a virtual port channel (vPC) peer link. You cannot configure broadcast or multicast addresses as static MAC addresses. These static MAC addresses override any dynamically learned MAC addresses on those interfaces. You can configure MAC addresses, which are called static MAC addresses, to statically point to specified interfaces on the device. The device then forwards subsequent frames to a single LAN port without flooding all LAN ports. When the destination station replies, the device adds its relevant MAC source address and port ID to the address table. When the device receives a frame for a MAC destination address not listed in its address table, it floods the frame to all LAN ports of the same VLAN except the port that received the frame. The device dynamically builds the address table by using the MAC source address of the frames received. 1/10-Gigabit Ethernet operates in full duplex only. When packets can flow in both directions simultaneously, the effective Ethernet bandwidth doubles. In full-duplex mode, which is configurable on these interfaces, two stations can transmit and receive at the same time. Typically, 10/100-Mbps Ethernet operates in half-duplex mode, which means that stations can either receive or transmit. Because each LAN port connects to a separate Ethernet collision domain, servers in a switched environment achieve full access to the bandwidth.īecause collisions cause significant congestion in Ethernet networks, an effective solution is full-duplex communication. The device solves congestion problems caused by high-bandwidth devices and a large number of users by assigning each device (for example, a server) to its own 10-, 100-, 1000-Mbps, or 10-Gigabit collision domain. New connections can be made between different segments for the next packet. Switched connections between Ethernet segments last only for the duration of the packet. The device supports simultaneous, parallel connections between Layer 2 Ethernet segments.
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