Owner's Manual

926 | Appendix E. Glossary
NETGEAR 8800 User Manual
cluster In BGP, a cluster is formed within an AS by a route reflector and its client routers.
combo port Combination port. On some NETGEAR devices, certain ports can be used as
either copper or fiber ports.
CoS Class of Service. Specifying the service level for the classified traffic type.
CRC Cyclic redundancy check. This simple checksum is designed to detect
transmission errors. A decoder calculates the CRC for the received data and
compares it to the CRC that the encoder calculated, which is appended to the
data. A mismatch indicates that the data was corrupted in transit.
CRC error Cyclic redundancy check error. This is an error condition in which the data failed
a checksum test used to trap transmission errors. These errors can indicate
problems anywhere in the transmission path.
CSPF Constrained shortest path first. An algorithm based on the shortest path first
algorithm used in OSPF, but with the addition of multiple constraints arising from
the network, the LSP, and the links. CSPF is used to minimize network
congestion by intelligently balancing traffic.
D
DA Destination address. The DA is the IP or MAC address of the device that is to
receive the packet.
DAD Duplicate Address Detection. IPv6 automatically uses this process to ensure
that no duplicate IP addresses exist.
default encapsulation mode In STP, default encapsulation allows you to specify the type of BPDU
encapsulation to use for all ports added to a given STPD, not just to one
individual port. The encapsulation modes are:
• 802.1d—This mode is used for backward compatibility with previous STP
versions and for compatibility with third-party switches using IEEE standard
802.1d.
• EMISTP—Multiple Instance Spanning Tree Protocol (EMISTP) mode is an
extension of STP that allows a physical port to belong to multiple STPDs by
assigning the port to multiple VLANs.
• PVST+—This mode implements PVST+ in compatibility with third-party
switches running this version of STP.
designated port In STP, the designated port provides the shortest path connection to the root
bridge for the attached LAN segment. Each LAN segment has only one
designated port.
Device Manager The Device Manager is an NETGEAR-proprietary process that runs on every
node and is responsible for monitoring and controlling all of the devices in the
system. The Device Manager is useful for system redundancy.
C (Continued)