Nokia 7210 SAS-M User Manual

Virtual Chassis
224
7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Configuration Guide
3HE 16132 AAAB TQZZA Edition: 01
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 software module keeps track of the shortest
path from a specific source IMM to a destination IMM and uses it to forward packets
through the stack using the stacking ports.
A VC can operate as a Layer 2 device, where only VLANs are used for uplink
connectivity, or as a full-fledged IP/MPLS platform with support for IP/MPLS-based
Layer 2 and Layer 3 VPNs.
5.1.1 Node Roles in the VC
The nodes in a VC are modeled in software as either CPM nodes or IMM nodes. The
CPMs and the IMMs are interconnected through the stacking ports.
In a VC, CPMs also act as IMMs. Because of their dual role, CPMs are referred to as
CPM-IMM nodes. Up to three nodes are allowed in a VC. Two of the nodes can be
configured as CPM-IMM. The two nodes configured as CPM-IMM nodes provide
control plane redundancy. The remaining node in the VC must be an IMM node. The
IMM node is referred to as an IMM-only node. By default, the nodes in a VC are IMM-
only nodes. If more than two nodes are configured as CPM-IMM nodes, the software
logs an error.
Note: The following functionality is currently not supported on VCs:
• Synchronous Ethernet network synchronization
• 1588v2 PTP network synchronization

Nokia 7210 SAS-M Specifications

General

Brand	Nokia
Model	7210 SAS-M
Category	Cell Phone
Language	English