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Chapter 11 Avaya P330 Layer 2 Features
78 Avaya P334T-ML User’s Guide
This classification is based either on the packet’s original priority tag, or, if the
packet arrives at the port untagged, based on the priority configured for the ingress
port (using the set port level CLI command).
In cases where the packet was received tagged, this priority tag is retained when the
packet is transmitted through a tagging port.
In cases where the priority is assigned based on the ingress priority of the port, then
on an egress tagging port the packet will carry a priority tag of:
• If the ingress port was a P330 port or a Gigabit Ethernet port (51,52) on the
P334T-ML, the packet will be tagged either priority 0 or priority 4, depending
on the queue it was assigned to (High Priority=4, Normal Priority=0).
• If the ingress port was a 10/100 Ethernet port on the P334T-ML, the packet will
be 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 port 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. Once
a reply is received, the CAM table is updated with the new address/VLAN port
mapping.