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Overview of the BCC

117383-C Rev. 00

1-7

•A class is a template for a configurable object (such as Ethernet or the

protocol IP). When you add a new object to the configuration of a device, the

BCC creates a copy (an instance) of the appropriate template.

•An instance is an object uniquely identifiable within the total device

configuration. Each instance is identified by its BCC instance identifier.

BCC Instance Identifier

A BCC instance identifier uniquely identifies a single instance of an object

configured on a device. The BCC instance ID consists typically of the name of the

object, combined with the values you specify for its required parameters. For

example, the BCC instance ID for an Ethernet interface on a BN platform consists

ethernet

/slot/connector

, as in

ethernet/2/1

; the BCC instance ID for an

Ethernet interface on an ASN platform consists of

ethernet

/slot/module/connector

, as in

ethernet/1/2/2

For some objects, the BCC automatically appends an internally generated number

to ensure the uniqueness of the BCC instance ID. For example, the BCC creates

an instance ID for ARP on IP based on the object name (arp), plus the address of

the underlying IP interface (1.2.3.4), plus an internally generated integer, resulting

in an ID such as

arp/1.2.3.4/1

In other rare cases, a configurable object may also have required parameters that

do not become part of its BCC instance ID. For example, the global OSPF object

has a required router-id parameter that does not become part of the instance ID.

(Many such required parameters end in “-id,” such as global-id and router-id.)

Each object has its own requirements for unique instance identification within the

total device configuration.

Global (Box-Wide) Objects

Global (or box-wide) objects provide services uniformly to all slots of a network

device. Examples include global IP, BGP, TCP, SNMP, FTP, TFTP, and Telnet.

Some protocols, such as IP, RIP, and OSPF, have global and interface-level

objects.

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