Netgear XCM8810 Chassis User Manual - Page 929

NETGEAR 8800 User Manual F fast path FDB FIB frame full-duplex G GBIC Gigabit Ethernet H half-duplex header hitless failover This term refers to the data path for a packet that traverses the switch and does not require processing by the CPU. Fast path packets are handled entirely by ASICs and are forwarded at wire speed rate. Forwarding database. The switch maintains a database of all MAC address received on all of its ports and uses this information to decide whether a frame should be forwarded or filtered. Each FDB entry consists of the MAC address of the sending device, an identifier for the port on which the frame was received, and an identifier for the VLAN to which the device belongs. Frames destined for devices that are not currently in the FDB are flooded to all members of the VLAN. For some types of entries, you configure the time it takes for the specific entry to age out of the FDB. Forwarding Information Base. The Layer 3 routing table is referred to as the FIB. This is the unit of transmission at the data link layer. The frame contains the header and trailer information required by the physical medium of transmission. This is the communication mode in which a device simultaneously sends and receives over the same link, doubling the bandwidth. Thus, a full-duplex 100 Mbps connection has a bandwidth of 200 Mbps, and so forth. A device either automatically adjusts its duplex mode to match that of a connecting device or you can configure the duplex mode; all devices at 1 Gbps or higher run only in full-duplex mode. Gigabit Interface Connector. These devices, available in a variety of fiber modes and physical shapes, provide the physical interface to a gigabit Ethernet connection. This is the networking standard for transmitting data at 1000 Mbps or 1 Gbps. Devices can transmit at multiples of gigabit Ethernet as well. This is the communication mode in which a device can either send or receive data, but not simultaneously. (Devices at 1 Gbps or higher do not run in half-duplex mode; they run only in full-duplex mode.) This is control information (such as originating and destination stations, priority, error checking, and so forth) added in front of the data when encapsulating the data for network transmission. In the NETGEAR implementation on modular switches, hitless failover means that designated configurations survive a change of primacy between the two MSMs with all details intact. Thus, those features run seamlessly during and after control of the system changes from one MSM to another. Appendix E. Glossary | 929