Specifications

Summary of Features
ExtremeWare XOS 11.0 Concepts Guide 21
• VRRP on page 24
• IP Multicast Routing on page 24
Virtual Routers
ExtremeWare XOS supports virtual routers. This capability allows a single physical switch to be split
into multiple virtual routers. This feature separates the traffic forwarded by a virtual router from the
traffic on a different virtual router. Each virtual router maintains a separate logical forwarding table,
which allows the virtual routers to have overlapping address spaces. Because each virtual router
maintains its own separate routing information and switch ports can belong to one and only one virtual
router, packets arriving at a port on one virtual router can never be switched to the ports on another. In
this release of ExtremeWare XOS, the management port belongs to one virtual router and all other ports
belong to other virtual routers.
With multiple virtual routers contained on a single physical switch, some commands in
ExtremeWare XOS now require you to specify to which virtual router the command applies. For
example, when you use the
ping command, you must specify from which virtual router the ping
packets are generated. Many commands that deal with switch management use the management virtual
router by default. See the ExtremeWare XOS Command Reference Guide Software Version 11.0 for
information on the defaults for individual commands.
NOTE
The term “virtual router” is also used with VRRP. VRRP uses the term to refer to a single virtual router
that spans more than one physical router and allows multiple switches to provide redundant routing
services to users. For more information about VRRP, see Chapter 14.
For more information on virtual routers, see Chapter 6
Software Modules
With software version 11.0, ExtremeWare XOS introduces the ability for the user to download a discrete
software module that contains complete functionality for a specified feature. The user no longer must
download the entire image in order to obtain these specific modules. Secure Shell (SSH) is the software
module available with version 11.0.
SSH
To access the switch using the Secure Shell (SSH), you must download, install, and enable the SSH
software module. Once installed, you use the SSH to access the switch. You obtain the SSH software
module through your Extreme Networks support account on the website, once you provide the
required information.
For more information on SSH, see Chapter 10.
Virtual LANs
The ExtremeWare XOS VLAN feature enables you to construct your broadcast domains without being
restricted by physical connections. A VLAN is a group of location- and topology-independent devices
that communicate as if they were on the same physical local area network (LAN).