BGP communicates within one AS using Interior BGP (IBGP) because BGP does not work well with IGP.
Thus the routers inside the AS maintain two routing tables: one for the IGP and one for IBGP. BGP uses
exterior BGP (EBGP) between dierent autonomous systems.
BPDU
In STP (Spanning Tree Protocol), a Bridge Protocol Data Unit is a packet that initiates communication
between devices. BPDU packets contain information on ports, addresses, priorities, and costs and they
ensure that the data ends up where it was intended to go. BPDU messages are exchanged across
bridges to detect loops in a network topology. The loops are then removed by shutting down selected
bridge interfaces and placing redundant switch ports in a backup, or blocked, state.
BSS
Basic Service Set is a wireless topology consisting of one access point connected to a wired network
and a set of wireless devices. Also called an infrastructure network. See also IBSS (Independent Basic
Service Set).
CA
A Certificate Authority is a trusted third-party that generates and signs certificates. A CA may be a
commercial concern, such as GoDaddy or GeoTrust. A CA may also be an in-house server for certificates
used within an enterprise.
carrier VLAN
In STP (Spanning Tree Protocol), carrier VLAN (Virtual LAN)s define the scope of the STPD (Spanning
Tree Domain), including the physical and logical ports that belong to the STPD as well as the 802.1Q
tags used to transport EMISTP- or PVST+-encapsulated BPDUs. Only one carrier VLAN can exist in any
given STPD.
CCM
In CFM (Connectivity Fault Management), Connectivity Check Messages are frames transmitted
periodically by a MEP (Maintenance End Point) to ensure connectivity across the maintenance entities
to which the transmitting MEP belongs. The CCMs contain a unique ID for the specified domain.
Because a failure to receive a CCM indicates a connectivity fault in the network, CCMs proactively check
for network connectivity.
CFM
Connectivity Fault Management allows an ISP to proactively detect faults in the network for each
customer service instance individually and separately. CFM comprises capabilities for detecting,
verifying, and isolating connectivity failures in virtual bridged LANs.
Chalet
Chalet is a web-based user interface for setting up and viewing information about a switch, removing
the need to enter common commands individually in the CLI.
CHAP
Challenge-Handshake Authentication Protocol is one of the two main authentication protocols used to
verify a user's name and password for PPP Internet connections. CHAP is more secure because it
performs a three-way handshake during the initial link establishment between the home and remote
machines. It can also repeat the authentication anytime after the link has been established.
CIST
Glossary
ISW Series Managed Industrial Ethernet Switch Command Reference Guide 153
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