ExtremeWare XOS 11.3 Concepts Guide
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ELRP Extreme Loop Recovery Protocol. ELRP is an Extreme Networks-
proprietary protocol that allows you to detect Layer 2 loops.
EMISTP Extreme Multiple Instance Spanning Tree Protocol. This Extreme
Networks-proprietary protocol uses a unique encapsulation method
for STP messages that allows a physical port to belong to multiple
STPDs.
EMS Event Management System. This Extreme Networks-proprietary
system saves, displays, and filters events, which are defined as any
occurrences on a switch that generate a log message or require action.
encapsulation mode Using STP, you can configure ports within an STPD to accept specific
BPDU encapsulations. The three 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—Extreme Multiple Instance Spanning Tree Protocol 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.
EPICenter EPICenter is an Extreme Networks-proprietary graphical user interface
(GUI) network management system.
ESRP Extreme Standby Router Protocol. ESRP is an Extreme Networks-
proprietary protocol that provides redundant Layer 2 and routing
services to users.
ESRP-aware device This is an Extreme Networks device that is not running ESRP itself but
that is connected on a network with other Extreme Networks switches
that are running ESRP. These ESRP-aware devices also fail over.
ESRP domain An ESRP domain allows multiple VLANs to be protected under a
single logical entity. An ESRP domain consists of one domain-master
VLAN and zero or more domain-member VLANs.
ESRP-enabled device An ESRP-enabled device is an Extreme Networks switch with an ESRP
domain and ESRP enabled. ESRP-enabled switches include the ESRP
master and slave switches.
ESRP groups An ESRP group runs multiple instances of ESRP within the same
VLAN (or broadcast domain). To provide redundancy at each tier, use
a pair of ESRP switches on the group.
ESRP instance You enable ESRP on a per domain basis; each time you enable ESRP is
an ESRP instance.
ESRP VLAN A VLAN that is part of an ESRP domain, with ESRP enabled, is an
ESRP VLAN.
E (Continued)
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