In an MSTP (Multiple Spanning Tree Protocol) environment, Common and Internal Spanning Tree is a
single spanning tree domain that connects MSTP regions. The CIST is responsible for creating a loop-
free topology by exchanging and propagating BPDU (Bridge Protocol Data Unit)s across MSTP regions.
You can configure only one CIST on each switch.
CIST regional root bridge
Within an MSTP (Multiple Spanning Tree Protocol) region, the bridge with the lowest path cost to the
CIST (Common and Internal Spanning Tree) root bridge is the CIST regional root bridge If the CIST root
bridge is inside an MSTP region, that same bridge is the CIST regional root for that region because it has
the lowest path cost to the CIST root. If the CIST root bridge is outside an MSTP region, all regions
connect to the CIST root through their respective CIST regional roots.
CIST root bridge
In an MSTP (Multiple Spanning Tree Protocol) environment, the bridge with the lowest bridge ID
becomes the CIST (Common and Internal Spanning Tree) root bridge. The bridge ID includes the bridge
priority and the MAC address. The CIST root bridge can be either inside or outside an MSTP region. The
CIST root bridge is unique for all regions and non-MSTP bridges, regardless of its location.
CLI
Command Line Interface. The CLI provides an environment to issue commands to monitor and manage
switches and wireless appliances.
CNP
Customer Network Port.
CoS
Class of Service specifies the service level for the classified trac type.
CRC
Cyclic Redundancy Check is a simple checksum is designed to detect transmission errors. A decoder
calculates the CRC for the received data and compares it to the CRC that the encoder calculated, which
is appended to the data. A mismatch indicates that the data was corrupted in transit.
CVID
CVLAN ID. The CVID represents the CVLAN tag for tagged VLAN (Virtual LAN) trac.
CVLAN
Customer VLAN (Virtual LAN).
Data Center Connect
DCC, formerly known as DCM (Data Center Manager), is a data center fabric management and
automation tool that improves the eciency of managing a large virtual and physical network. DCC
provides an integrated view of the server, storage, and networking operations, removing the need to
use multiple tools and management systems. DCC automates VM assignment, allocates appropriate
network resources, and applies individual policies to various data objects in the switching fabric
(reducing VM sprawl). Learn more about DCC at http://www.extremenetworks.com/product/data-
center-connect/.
DCB
Glossary
ISW Series Managed Industrial Ethernet Switch Command Reference Guide 154
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