Transition Security Network is a subset of RSN (Robust Security Network), which provides an enhanced
security solution for legacy hardware. The Wi-Fi Alliance has adopted a solution called WPA, based on
TSN. RSN and TSN both specify IEEE 802.1x authentication with Extensible Authentication Protocol
(EAP).
UDP
User Datagram Protocol is an ecient but unreliable, connectionless protocol that is layered over IP (as
is TCP (Transmission Control Protocol)). Application programs must supplement the protocol to provide
error processing and retransmitting data. UDP is an OSI Layer 4 protocol.
virtual router
In the Extreme Networks implementations, virtual routers allow a single physical switch to be split into
multiple virtual routers. Each virtual router has its own IP address and maintains a separate logical
forwarding table. Each virtual router also serves as a configuration domain. The identity of the virtual
router you are working in currently displays in the prompt line of the CLI. The virtual routers discussed in
relation to Extreme Networks switches themselves are not the same as the virtual router in VRRP
(Virtual Router Redundancy Protocol).
In VRRP, the virtual router is identified by a virtual router (VRID) and an IP address. A router running
VRRP can participate in one or more virtual routers. The VRRP virtual router spans more than one
physical router, which allows multiple routers to provide redundant services to users.
VLAN
The term VLAN is used to refer to a collection of devices that communicate as if they are on the same
physical LAN. Any set of ports (including all ports on the switch) is considered a VLAN. LAN segments
are not restricted by the hardware that physically connects them. The segments are defined by flexible
user groups you create with the CLI.
VM
A virtual machine is a logical machine that runs on a VM server, which can host multiple VMs.
VMAN
In ExtremeXOS software, Virtual MANs are a bi-directional virtual data connection that creates a private
path through the public network. One VMAN is completely isolated from other VMANs; the
encapsulation allows the VMAN trac to be switched over Layer 2 infrastructure. You implement VMAN
using an additional 892.1Q tag and a configurable EtherType; this feature is also known as Q-in-Q
switching.
VRRP
The Virtual Router Redundancy Protocol specifies an election protocol that dynamically assigns
responsibility for a virtual router (VR) to one of the VRRP routers on a LAN. The VRRP router controlling
the IP address(es) associated with a virtual router is called the master router, and forwards packets sent
to these IP addresses. The election process provides dynamic failover in the forwarding responsibility
should the master router become unavailable. In case the master router fails, the virtual IP address is
mapped to a backup router's IP address; this backup becomes the master router. This allows any of the
virtual router IP addresses on the LAN to be used as the default first-hop router by end-hosts. The
advantage gained from using VRRP is a higher availability default path without requiring configuration
of dynamic routing or router discovery protocols on every host. VRRP is defined in RFC 2338.
WEP
Glossary
ISW Series Managed Industrial Ethernet Switch Command Reference Guide 166
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