Extreme Networks ExtremeWare XOS Guide Manual page 473

V (continued)
virtual router MAC address
VLAN
VLSM
VMAN
VR-Control
VR-Default
VRID
VR-Mgmt
ExtremeWare XOS 11.1 Concepts Guide
In VRRP, RFC 2338 assigns a static MAC address for the first five
octets of the VRRP virtual router. These octets are set to 00-00-5E-00-
01. When you configure the VRRP VRID, the last octet of the MAC
address is dynamically assigned the VRID number.
Virtual LAN. 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.
Variable-length subnet masks. In OSPF, VLSMs provide subnets of
different sizes within a single IP block.
Virtual MAN. In ExtremeWare XOS software, VMANs 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 traffic 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.
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.)
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.)
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.
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.)
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