Table Of Contents
OIR Support for Analog and Digital Modem Network Modules
Supported Standards, MIBs, and RFCs
Disabling the T1/E1 Controller
Verifying that the T1/E1 Controller is Disabled
Verifying that the T1/E1 Controller is Enabled
Configuring the Analog Modem Network Module
Configuring the Group Asynchronous Interface
Configuring the Digital Modem Network Module
Configuring the T1/E1 Controller
Configuring the ISDN D-Channel
Configuring the Group Asynchronous Interface
Configuring the Dialer Interface
OIR Support for Analog and Digital Modem Network Modules
This document describes the (OIR) online insertion and removal, also referred to as hot swapping, of analog and digital modem network modules installed in the Cisco 3660 router.
The analog modem network modules that can use these features are:
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NM-8AM
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The digital modem network modules that can use these features are:
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This document contains the following topics:
Feature Overview
This document describes the following:
Hot Swap (OIR) Feature
This feature enables you to replace one network module with another network module of the same kind without affecting system operation. For example, an NM-12DM can be replaced only by another NM-12DM, and not by an NM-6DM.
Hot swap functionality allows the system to determine when a change occurs in the unit's physical configuration, followed by a reallocation of the unit's resources to allow all interfaces to function adequately. This feature allows interfaces on the network module to be reconfigured while other interfaces on the router remain unchanged. The interrupt routine must ensure that the interrupt line has reached a stable state.
Note
The software does the administrative work involved in handling the removal and insertion of the network module. When the network module is removed, the hardware subsystem shuts down the PCI bridge chip to the network module thereby ensuring against bus errors on the secondary PCI bus. A hardware interrupt is then sent to the software subsystem.
The software reconfigures the network module interfaces. When a network module is inserted, it is analyzed and initialized so that the end user can configure it properly. The initialization routines used during OIR are the same as those called when the router is booted. System resources, also handled by software, are allocated to the new interface. When a network module is removed, the resources associated with the empty slot must either be freed or altered to indicate the change in its status.
If a network module is reinserted into the same slot it was removed from, or if an identical network module is inserted in its place, many of the control blocks from the previous installation will be reused. This is necessary due to the implementation by Cisco IOS software of certain control blocks, and has the benefit of saving the configuration from the previously installed network module.
Hot Addition Feature
This feature allows a new network module to be inserted into an empty router slot without having to shut down the system.
When the new network module is inserted, the system calls the same initialization routines that were called during power up. The network module is automatically configured and verified, but all interfaces are left in the shutdown state.
Hot Deletion Feature
This feature allows a network module to be removed from the router without having to shut down the system and interrupt operation of the other installed network modules.
When a network module is removed, all allocated resources must be returned, and control blocks are freed. Some of these control blocks are not returned to the pool of free buffers, but are queued and retained in the event that an identical network module is reinstalled in the slot. The active configuration file deletes all information associated with the removed network module.
Benefits
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Restrictions
These are restrictions to the features described in this document:
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The minimum amount of I/O memory required for the hot swap or hot addition features to work on the Cisco 3660 router is calculated by:
I/O memory size=6 slots * (network module that uses maximum I/O memory in private pools) + (size of the fallback pool) + (size of the public buffer pool) + (2 onboard Fast Ethernet ports) + AIM slots + TDM•
Router (config)# snmp queue-length 16Related Documents
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Supported Platform
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Supported Standards, MIBs, and RFCs
No new or modified standards, MIBs, and RFCs are supported by this feature.
Prerequisites
Prerequisites for this feature to work on a system with an analog modem network module:
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Prerequisites for this feature to work on a system with a digital modem network module:
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Note
The BRI S/T module with Cisco part number NM-4B-S/T or NM-8B-S/T must be revision level -03, and the BRI U module with Cisco product number NM-4B-U or NM-8B-U must be revision level -06.
Configuration Tasks
The OIR feature does not need external configuration. It is disabled during system boot and initialization. After the system is initialized, the processor interrupt for the OIR feature is also enabled.
See the following sections for configuration tasks necessary for the online insertion and removal of analog and digital modem network modules in a Cisco 3660 router. Each task in the list indicates if the task is optional or required.
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Disabling the T1/E1 Controller
Before the network module is physically removed from the router, shut down its T1 or E1 controller.
Verifying that the T1/E1 Controller is Disabled
To verify that the T1/E1 controller is disabled:
Step 1
Router# show controllers t1T1 4/1 is administratively down.No alarms detected.Framing is ESF, Line Code is AMI, Clock Source is LineData in current interval (0 seconds elapsed):0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs,0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs,0 Severely Err Secs, 0 Unavail SecsTotal Data (last 79 15 minute intervals)0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs,0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs,0 Severely Err Secs, 0 Unavail Secs
Enabling the T1/E1 Controller
After the network module has been hot swapped, enable its T1/E1 controller.
Verifying that the T1/E1 Controller is Enabled
To verify that the T1/E1 controller is enabled:
Step 1
Router# show controllers t1T1 4/1 is up.No alarms detected.Framing is ESF, Line Code is AMI, Clock Source is LineData in current interval (0 seconds elapsed):0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs,0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs,0 Severely Err Secs, 0 Unavail SecsTotal Data (last 79 15 minute intervals)0 Line Code Violations, 0 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs,0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs,0 Severely Err Secs, 0 Unavail Secs
Configuration Examples
This section provides configuration examples for the different components in your system.
Configuring the Analog Modem Network Module
If your system contains an analog modem network module, you must configure the group asynchronous interface and the line.
Configuring the Group Asynchronous Interface
interface Group-Async1ip address negotiatedno ip directed-broadcastencapsulation pppdialer in-banddialer idle-timeout 512 eitherdialer-group 1async default routingasync mode dedicatedno peer default ip addressno fair-queueno cdp enableppp authentication chapgroup-range 97 112hold-queue 10 inConfiguring the Dialer List
dialer-list 1 protocol ip permitConfiguring the Line
line 97 112exec-timeout 0 0autoselect pppscript dialer diallogin localmodem InOuttransport input allstopbits 1flowcontrol hardwareConfiguring the Digital Modem Network Module
If your system contains a digital modem network module, you must configure the T1/E1 controller, ISDN D-channel, group asynchronous interface, dialer interface, dialer list, and the line.
Configuring the T1/E1 Controller
controller T1 1/0framing esflinecode b8zspri-group timeslots 1-24Configuring the ISDN D-Channel
interface Serial1/0:23no ip addressno ip directed-broadcastisdn switch-type primary-5essisdn incoming-voice modemno fair-queueno cdp enableConfiguring the Group Asynchronous Interface
interface Group-Async1no ip addressno ip directed-broadcastencapsulation pppload-interval 30dialer in-banddialer pool-member 1async mode dedicatedno fair-queueno cdp enableppp authentication chapgroup-range 97 120Configuring the Dialer Interface
interface Dialer1ip address 199.0.1.2 255.255.255.0no ip redirectsno ip directed-broadcastno ip proxy-arpencapsulation pppload-interval 30dialer remote-name d1dialer pool 1dialer idle-timeout 7200 eitherdialer-group 1no fair-queuepulse-time 0no cdp enableConfiguring the Dialer List
dialer-list 1 protocol ip permitConfiguring the Line
line 97 120exec-timeout 0 0modem InOuttransport input allCommand Reference
There are no new or changed commands.
Glossary
CCO—Cisco Connection Online; Cisco Systems' primary, real-time support channel.
Hot swap—Removal and immediate replacement of a system component that does not affect other components in an operational system.
IOS—Internetworking Operating System; Cisco's networking software code base.
LAN—Local Area Network.
NM—Network module.
OIR—Online insertion and removal; removal or addition of a system component that does not affect other components in an operational system.
PCI—Peripheral Component Interconnect; bus interface used in the Cisco 3660 router.
SNMP—Simple Network Management Protocol; provides a means to monitor and control network devices, and to manage configurations, statistics collection, performance, and security.
WIC—WAN interface card.
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