Cisco 30 VIP Spezifikationen PDF herunterladen (Seite 14)

14 VIP-FE-TX Installation and Conﬁguration

Versatile Interface Processor Functions

Online Insertion and Removal—An Overview

The OIR feature allows you to remove and replace a VIP board while the system is operating; you

do not need to notify the software or shut down the system power.

Note The VIP port adapters themselves do not support OIR, nor are they FRUs.

This section describes mechanical functions of system components, emphasizes the importance of

following correct procedures to avoid unnecessary board failures, and is for background only;

speciﬁc VIP procedures follow in the section “VIP Installation” on page 17.

Each interface processor contains a receptacle with which it connects to the system backplane. Each

backplane connector comprises a set of tiered pins, in three lengths. The pins send speciﬁc signals

to the system as they make contact with the card. The system assesses the signals it receives and the

order in which it receives them to determine what event is occurring and what task it needs to

perform, such as reinitializing new interfaces or shutting down removed ones.

For example, when inserting an interface processor, the longest pins make contact with the

backplane ﬁrst, and the shortest pins make contact last. The system recognizes the signals and the

sequence in which it receives them. The system expects to receive signals from the individual pins

in this logical sequence, and the ejector levers help to ensure that the pins mate in this sequence.

When you remove or insert an interface processor, the backplane pins send signals to notify the

system, which then performs as follows:

1 Rapidly scans the backplane for conﬁguration changes and does not reset any interfaces.

2 Initializes all newly inserted interface processors, noting any removed interfaces and placing

them in the administratively shut down state.

3 Brings all previously conﬁgured interfaces on the interface processor back to the state they were

in when they were removed. Any newly inserted interfaces are put in the administratively shut

down state, as if they were present (but unconﬁgured) at boot time. If a similar interface processor

type has been reinserted into a slot, then its ports are conﬁgured and brought on line up to the

port count of the original interface processor.

The system brings on line only interfaces that match the current conﬁguration and were previously

conﬁgured as up; all others require that you conﬁgure them with the conﬁgure command. OIR

functionality enables you to add, remove, or replace interface processors with the system online,

which provides a method that is seamless to end users on the network, maintains all routing

information, and ensures session preservation.

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Cisco 30 VIP Spezifikationen Seite 14