Ethernet
Issue 2 July 2005 117
In cases where the priority is assigned based on the ingress priority of the port, then on an
egress tagging port the packet will tagged according to the ingress port priority value configured
by the set port level CLI command.
MAC Address
The MAC address is a unique 48-bit value associated with any network adapter. MAC
addresses are also known as hardware addresses or physical addresses. They uniquely
identify an adapter on a LAN.
MAC addresses are 12-digit hexadecimal numbers (48 bits in length). By convention, MAC
addresses are usually written in one of the following two formats:
● MM:MM:MM:SS:SS:SS
● MM-MM-MM-SS-SS-SS
The first half of a MAC address contains the ID number of the device manufacturer. These IDs
are regulated by an Internet standards body. The second half of a MAC address represents the
serial number assigned to the device by the manufacturer.
CAM Table
The CAM Table contains a mapping of learned MAC addresses to ports and VLANs. The switch
checks forwarding requests against the addresses contained in the CAM Table:
● If the MAC address appears in the CAM Table, the packet is forwarded to the appropriate
port.
● If the MAC address does not appear in the CAM Table, or the MAC Address mapping has
changed, the frame is duplicated and copied to all the ports on the same VLAN. Once a
reply is received, the CAM table is updated with the new address/VLAN port mapping.
MAC Aging
The MAC Aging feature allows the user to configure a time interval after which unused entries in
the MAC Table will be deleted.
Following is the description of configuration of the C360 for the MAC Aging functionality.
● MAC Aging is configured on the stack level.
● MAC Aging can be globally enabled/disabled using the set mac-aging command.
● "mac-aging-time" is set in minutes:
- Default = five minutes
- Minimum time = one minute; maximum time = 3600 min.
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