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3 C O M
®
X R N
™
I N T E R C O N N E C T K I T D ATA S H E E T
"3Com offers a revolutionary
approach to build enterprise
LAN cores with innovative
technology that breaks new
ground in the networking
industry."
Zeus Kerravala, vice president of
Enterprise Infrastructure, Yankee Group
2
XRN Technology Overview
3Com eXpandable Resilient
Networking (XRN
™
) is a patented
technology that lets enterprise
customers design and implement
affordable, high-availability Gigabit
Ethernet core and aggregation back-
bones that provide exceptional
performance and flexibility. XRN
technology lets multiple Gigabit Layer
3 switches function as a single multi-
XRN Technology Hierarchy
X
R
e
pandable
Distributed Resilient Routing
3Com Gigabit Multilayer Switching Software
3Com Gigabit Multilayer Switching ASIC Technology
3Com Network Management
The main components of the XRN
technology are as follows:
Distributed Device Management (DDM)
DDM lets customers configure and
manage the Distributed Fabric as a
single entity via the CLI, Web inter-
face, or SNMP. In the event of failure
in one of the switches, management
access to the remaining switch is
retained on the same IP address.
Distributed Link Aggregation (DLA)
DLA enables wiring closet switches or
hosts to create Aggregated Links that
are dual-homed across the switches in
the Distributed Fabric. Should a port
in the Aggregated Link fail, traffic
will be forwarded via the remaining
ports. DLA provides Intelligent Local
Forwarding—enabling each switch in
the Fabric to make its own forwarding
decisions, without sending traffic
across the Fabric Interconnect.
layer switching entity called a
Distributed Fabric. The Fabric is
managed and configured as a single
device, even though each switch in
the Distributed Fabric makes its own
Layer 2 and Layer 3 forwarding
decisions.
The XRN technology hierarchy is
shown in figure 1.
N
esilient
etworking Technology
Distributed Device
Management
Distributed Resilient Routing (DRR)
DRR lets both switches in the
Distributed Fabric act as a single
logical router. The switches use the
same router interfaces and mirror
each other's routing tables. This pro-
tects the network against unit failure
and enables each switch to locally
route traffic for greater Layer 3 for-
warding performance.
XRN Phase One, enabled by the
3Com XRN Interconnect Kit, is the
first evolution of XRN technology. It
is supported on the 3Com Switch
4050 and 4060, and the SuperStack 3
Switch 4900 family. XRN Phase One
lets customers build a Distributed
Fabric with two 3Com switches which
are managed as a single logical entity.
A Fabric retains the software
capabilities and functionality of its
component switches.
Distributed Link Aggregation
figure 1