Cisco AS5800 Specifications download pdf (Page 248)

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Cisco AS5800 Operations, Administration, Maintenance, and Provisioning Guide

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Chapter 6 Provisioning

Split Dial Shelves

• If the firmware specified is not part of the firmware list, a message is printed to the console. The

firmware name is stored in the modem pool structures until that modem card is updated with the

specified firmware image. The firmware upgrade then occurs when that modem card is rebooted.

• If any modem module has an active call on it, the firmware upgrade request is queued and deferred

until the modem module becomes free.

Split Dial Shelves

The split mode is intended to support two router shelves connected to a single dial shelf. To use this

arrangement as intended, both router shelves need a split dial shelf configured. However, a second router

is not required; a single router can run in split mode with all slots owned by that router.

Split-Dial-Shelf Configuration

Split-dial-shelf configuration is implemented by connecting two router shelves to a single dial shelf. You

allocate the slots in the dial shelf between the two router shelves to achieve the desired configuration.

The two router shelves are configured to run in split mode by a new top-level router configuration

command:

dial-shelf split slots {slot-numbers}

where slot-numbers is a list of the dial-shelf slot numbers (from 0 to 11) that the router owns, with the

slot numbers separated by spaces. Slot ownership for each of the two router shelves is configured

individually using the dial-shelf split slots command.

• While a router is in split mode, additional slots can be added to the set that the router owns by

entering a dial-shelf split slots command listing the new slots. The effect of entering two (or more)

dial-shelf split slots commands with different slot numbers is cumulative.

• Slots must be explicitly removed from a router’s list of owned slots with the remove command:

dial-shelf split slots remove {slot-numbers}.

• A single router can also be configured in split mode but with no slots owned, by using the keyword

none instead of slot numbers in the command (dial-shelf split slots none).

When you configure a Cisco AS5800 to operate in split mode, it is the same as having two

Cisco AS5800s, each having a separate set of feature boards assigned to its router that happen to be

sharing a single dial shelf. Modem pooling, for example, is the same as if you had two separate

Cisco AS5800s. Router shelf 1 has a modem pool that consists of all the modem cards that reside in slots

owned by router shelf 1. The same situation applies to router shelf 2.

Changing to Split Mode

This section describes the procedure required to transition a router from normal mode to split mode, and

change the set of slots a router owns while it is in split mode. The process of switching the ownership

of a slot from one router to the other is potentially disruptive. When a feature board is restarted, all calls

through that card are lost. Therefore, a router shelf cannot take over a slot until ownership is relinquished

by the router that currently claims ownership, either by reconfiguring the router or disconnecting that

router or its associated DSC.

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Cisco AS5800 Specifications Page 248