Cisco ASR 9000 Series Configuring Network Settings - Page 4

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Cisco ASR 9000 Series Configuring Network Settings

Overview of Port Extender Model

Overview of Port Extender Model
In the Port Extender Satellite switching system, a satellite switch is attached to its parent
Cisco ASR 9000 Series Router through physical ethernet ports.
In releases later than Cisco IOS XR Software Release 4.2.1, attachment models beyond the port extender
Note
model will also be supported.
The parent Cisco ASR 9000 Series Router is referred as the host in this model. From a management or
a provisioning point of view, the physical access ports of the satellite switch are equivalent to the
physical ethernet ports on the Cisco ASR9000 Series Router. You do not need a specific console
connection for managing the Satellite Switching System, except for debugging purposes. The interface
and chassis level features of the satellite are visible in the control plane of Cisco IOS XR software
running on the host. This allows the complete management of the satellites and the host as a single
logical router.
Figure 2
In this model, a single Cisco ASR 9000 Series Router hosts two satellite switches, SAT1 and SAT2, to
form an overall virtual Cisco ASR 9000 switching system; this is shown by the dotted line surrounding
the Cisco ASR 9000 Series Router, SAT1, and SAT2 in
This structure effectively appears as a single logical Cisco ASR 9000 Series Router to the external
network. External access switches A1, A2 and A3 connect to this overall virtual switch by physically
connecting to SAT1 and SAT2 using normal ethernet links. The links between the satellite switches and
the Cisco ASR 9000 Series Router are ethernet links, and are referred as ICLs (Inter-Chassis Links). The
Cisco ASR 9000 Series Router is referred as the host in this system. When there is congestion on the
interchassis links, an inbuilt QoS protection mechanism is available for the traffic.
Cisco ASR 9000 Series Aggregation Services Router Interface and Hardware Component Configuration Guide
HC-710
Configuring the Satellite Network Virtualization (nV) System on the Cisco ASR 9000 Series Router
Port Extender Satellite Switching System
Access
LAG1
A1
Access
LAG2
A2
A3
"Unprotected"
SAT1
IC link
SAT2
Protected"
IC link
Virtual ASR9K Switching System
Figure
LC1
HOST ASR 9K
(single chassis
OR cluster)
LC2
2.
OL-26061-03