7210 SAS-MXP, R6, R12, S, SX, T BASIC SYSTEM
CONFIGURATION GUIDE RELEASE 22.9.R1
Virtual chassis
5 Virtual chassis
This chapter provides information about the parameters required to create a virtual chassis and how to
configure them. A virtual chassis is also known as a stack of nodes.
Topics in this chapter include provisioning, booting, and preprovisioning the virtual chassis; provisioning
service entities; replacing and upgrading nodes; and virtual chassis boot scenarios and split scenarios.
5.1 Overview
The 7210 SAS supports the grouping together, or stacking, of a set of nodes to create a virtual chassis
(VC). The following nodes can be stacked to form a VC:
• the 7210 SAS-Sx 1/10GE and its variants
• the 7210 SAS-S 1/10GE and its variants
A VC provides operational simplicity because it uses a single IP address and MAC address for a set of
stacked nodes. This set of nodes can be provisioned and monitored as a single platform rather than as
individual nodes. For example, users can provision services for all ports in the VC without having to log
in and access each node individually. As well, the NSP NFM-P management system can manage and
monitor the VC as a single platform rather than the individual nodes that comprise it.
In addition to operational simplicity, a VC increases service reliability by providing redundancy in the
following ways:
• If the node running control plane protocols in the VC fails, a standby node takes over the master node
function, minimizing service loss.
• Access devices can be connected using a mechanism such as LAG or G.8032 so that the impact of a
node failure in a VC is minimized for services on the access device.
Nodes can be added to or removed from a VC to increase the total available ports or to replace a failed
unit.
The nodes of the VC are connected through their stacking ports. The total capacity provided by the
stacking ports is equivalent to the sum of the bandwidth provided by the individual port. The stacking ports
are used for forwarding service traffic and for exchanging management and control messages between the
nodes in the VC. The VC control traffic is prioritized over other traffic on the stacking ports.
The 7210 SAS supports VC in standalone mode.
Nodes in the VC can take on the role of active CPM, standby CPM, or line card (also known as an IMM). In
a VC, two of the nodes can be designated as CPM nodes (along with a built in IMM) and the other node is
designated as an IMM-only node. See Node roles in the VC for more information. Each of the nodes in the
VC is provisioned as a card, similar to the cards in a chassis.
A VC can support uplink over-subscription, where only a few uplinks from the end nodes of the stack are
connected to the network, and all customer services are delivered through these uplink ports.
A VC can also support a configuration where the uplinks are not over-subscribed and operators can
connect any number of ports from each node in the stack to the network core. In Release 11.0, the VC
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