Glossary
ExtremeWare XOS 11.3 Concepts Guide
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DR Designated router. In OSPF, the DR generates an LSA for the
multiaccess network and has other special responsibilities in the
running of the protocol. The DR is elected by the OSPF protocol.
dropped packets These are packets that the switch received but does not transmit.
E
EAPS Extreme Automatic Protection Switching. EAPS is an Extreme
Networks-proprietary protocol that prevents looping Layer 2 of the
network. This feature is discussed in RFC 3619.
EAPS domain An EAPS domain consists of a series of switches, or nodes, that
comprise a single ring in a network. An EAPS domain consists of a
master node and transit nodes. The master node consists of one
primary and one secondary port. EAPS operates by declaring an EAPS
domain on a single ring.
EAPS link ID Each common link in the EAPS network must have a unique link ID.
The controller and partner shared ports belonging to the same
common link must have matching link IDs, and not other instance in
the network should have that link ID.
EBGP Exterior Border Gateway Protocol. EBGP is a protocol in the IP suite
designed to exchange network reachability information with BGP
systems in other ASs. EBGP works between different ASs.
ECMP Equal Cost Multi Paths. In OSPF, this routing algorithm distributes
network traffic across multiple high-bandwidth links to increase
performance. The Extreme Networks OSPF implementation supports
multiple equal cost paths between points and divides traffic evenly
among the available paths. As many as four links may be involved in
an ECMP link, and traffic is shared on the basis of IP source/
destination address session.
edge ports In STP, edge ports connect to non-STP devices such as routers,
endstations, and other hosts.
EDP Extreme Discovery Protocol. EDP is a protocol used to gather
information about neighbor Extreme Networks switches. Extreme
Networks switches use EDP to exchange topology information.
EEPROM Electrically erasable programmable read-only memory. EEPROM is a
memory that can be electronically programmed and erased but does
not require a power source to retain data.
EGP Exterior Gateway Protocol. EGP is an Internet routing protocol for
exchanging reachability information between routers in different ASs.
BGP is a more recent protocol that accomplishes this task.
election algorithm In ESRP, this is a user-defined criteria to determine how the master
and slave interact. The election algorithm also determines which
device becomes the master or slave and how ESRP makes those
decisions.
D (Continued)
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