Motorola V3229 - 14.4 Kbps Modem Specifications download pdf (Page 175)

Configuring and Managing Cisco Access Servers and Dial Shelves

How to Configure Dial Shelves

DC-121

Cisco IOS Dial Technologies Configuration Guide

If the other router shelf and the other DSC claim ownership of the same slot, the command adding the

slot should be rejected. However, should a configuration conflict exist, error messages are sent to both

routers and the card is not reset until one of the other router shelves and its DSC stop claiming ownership

of the slot. Normally, this will not happen until you issue a dial-shelf split slots remove command

surrendering the ownership claim on the slot by one of the routers.

Leaving Split Mode

Split mode is exited when the dial shelf configuration is changed by a no dial-shelf split slots command.

When the split dial shelf line is removed, the router shelf will start using all of the TDM timeslots.

Feature boards that were not owned in split mode and that are not owned by the other router will be reset.

Cards in slots that are owned by the other router will be reset, but only after the other DSC has been

removed or is no longer claiming the slots. The split dial shelf configuration should not be removed while

the second router shelf is still connected to the dial shelf.

When a router configured in split mode fails, all calls associated with the failed router are lost. Users

cannot connect back in until the failed router recovers and is available to accept new incoming calls;

however, the other split mode router shelf will continue to operate normally.

Troubleshooting Split Dial Shelves

The system will behave as configured as soon as the configuration is changed. The exception is when

there is a misconfiguration, such as when one router is configured in split mode and the other router is

configured in normal mode, or when both routers are configured in split mode and both claim ownership

of the same slots.

Problems can arise if one of the two routers connected to a dial shelf is not configured in split mode, or

if both are configured in split mode and both claim ownership of the same slots. If the state of the second

router is known when the dial-shelf split slots command is entered and the command would result in a

conflict, the command is rejected.

If a conflict in slot ownership does arise, both routers will receive warning messages until the conflict is

resolved. Any card in a slot which is claimed by both routers remains under the control of the router that

claimed it first, until you can resolve the conflict by correcting the configuration of one or both routers.

It should be noted that there can also be slots that are not owned by either router (orphan slots). Cards

in orphan slots cannot boot up until one of the two routers claims ownership of the slot because neither

DSC will download bootstrap images to cards in unowned orphan slots.

Managing a Split Dial Shelf

If you are installing split dial shelf systems, a system controller is available that provides a single system

view of multiple point of presences (POPs). The system controller for the Cisco AS5800 Universal

Access Server includes the Cisco 3640 router running Cisco IOS software. The system controller can be

installed at a remote facility so that you can access multiple systems through a console port or Web

interface.

There are no new MIBs or MIB variables required for the split dial shelf configuration. A split dial shelf

appears to Simple Network Management Protocol (SNMP) management applications as two separate

Cisco AS5800 systems. One console to manage the whole system is not supported—you must have a

console session per router shelf (two console sessions) to configure each split of the Cisco AS5800. The

system controller must manage a split dial shelf configuration as two separate Cisco AS5800 systems.

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