Extreme Networks ExtremeWare XOS 11.3, Руководство пользователя

Страница: 668 / 698

Glossary
ExtremeWare XOS 11.3 Concepts Guide
668
VoIP Voice over Internet Protocol is an Internet telephony technique. With
VoIP, a voice transmission is cut into multiple packets, takes the most
efficient path along the Internet, and is reassembled when it reaches
the destination.
VR-Control This virtual router is part of the embedded system in Extreme
Networks BlackDiamond 10K switches. The VR-Control is used for
internal communications between all the modules and subsystems in
the switch. It has no ports, and you cannot assign any ports to it. It
also cannot be associated with VLANs or routing protocols. (Referred
to as VR-1 in earlier ExtremeWare XOS software versions.)
VR-Default This virtual router is part of the embedded system in Extreme
Networks BlackDiamond 10K switches. The VR-Default is the default
virtual router on the system. All data ports in the switch are assigned
to this virtual router by default; you can add and delete ports from
this virtual router. Likewise, this virtual router contains the default
VLAN. Although you cannot delete the default VLAN from this
virtual router, you can add and delete any user-created VLANs. One
instance of each routing protocol is spawned for this virtual router,
and they cannot be deleted. (Referred to as VR-2 in earlier
ExtremeWare XOS software versions.)
VRID In VRRP, the VRID identifies the VRRP virtual router. Each VRRP
virtual router is given a unique VRID. All the VRRP routers that
participate in the VRRP virtual router are assigned the same VRID.
VR-Mgmt This virtual router is part of the embedded system in Extreme
Networks BlackDiamond 10K switches. The VR-Mgmt enables remove
management stations to access the switch through Telnet, SSH, or
SNMP sessions; and it owns the management port. The management
port cannot be deleted from this virtual router, and no other ports can
be added.The Mgmt VLAN is created is in this virtual router, and it
cannot be deleted; you cannot add or delete any other VLANs or any
routing protocols to this virtual router. (Referred to as VR-0 in earlier
ExtremeWare XOS software versions.)
VRRP Virtual Router Redundancy Protocol. VRRP specifies an election
protocol that dynamically assigns responsibility for a virtual router 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.
VRRP router Any router that is running VRRP. A VRRP router can participate in
one or more virtual routers with VRRP; a VRRP router can be a
backup router for one or more master routers.
V (Continued)