Node Roles In The Vc - Nokia 7210 Configuration Manual

Virtual Chassis
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
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.
Note: The following functionality is currently not supported on VCs:

5.1.1 Node Roles in the VC

The VC supports a minimum of one and up to a maximum of four nodes. The nodes
in a VC are modeled in software as either CPM nodes or IMM nodes. The CPMs and
the IMMs are interconnected through stacking ports.
In a VC, CPMs perform a dual role and will also act as IMMs. Consequently, a CPM
is referred to as a CPM-IMM node and the IMM is referred to as an IMM-only node.
Nodes in a VC are IMM-only nodes by default, but an IMM-only node is not
mandatory in a VC.
If only one node is configured in the VC (minimum requirement), it must be a CPM-
IMM node. A maximum of two CPM-IMM nodes can be configured on the VC to
provide control plane redundancy. In this case, the remaining nodes must be IMM
nodes. If more than two CPM-IMM nodes are configured, the software logs an error.
The user can also configure a VC with one CPM-IMM and one IMM-only node;
however, this configuration does not provide control-plane redundancy.
224
Node Roles in the VC
• Synchronous Ethernet network synchronization
• 1588v2 PTP network synchronization
Use subject to Terms available at: www.nokia.com
7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
for more information. Each of the nodes in the VC is
© 2021 Nokia.
Configuration Guide
3HE 17358 AAAB TQZZA