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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:
The digital modem network modules that can use these features are:
This document contains the following topics:
This document describes the following:
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.
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Note Hot swapping of WAN or voice interface cards is not supported, but you can hot swap a network module with a WAN or voice interface card installed in it. |
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.
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.
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.
These are restrictions to the features described in this document:
Router (config)# snmp queue-length 16
No new or modified standards, MIBs, and RFCs are supported by this feature.
Prerequisites for this feature to work on a system with an analog modem network module:
Prerequisites for this feature to work on a system with a digital modem network module:
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Note The PRI module (Cisco product number NM-1CT1, NM-2CT1, NM-1CT1-CSU, NM-2CT1-CSU, NM-1CE1B, NM-2CE1B, NM-1CE1U, or NM-2CE1U) must be revision level -03. 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. |
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.
Before the network module is physically removed from the router, shut down its T1 or E1 controller.
| Command | Purpose | |
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Step 1 | Router (config)# controller t1 slot/port | Enter controller configuration mode and specify the location of the controller associated with the analog or digital modem network module that will be hot swapped. The slot value indicates the router slot position of the installed network module. Depending on the router, enter a slot value from 0 to 3. The port value indicates the T1 or E1 link that you are configuring. Cisco IOS software creates the interfaces automatically when a module is installed. |
Step 2 | Router(config-controller)# shutdown | This command shuts down the interfaces on the controller. |
Step 3 | Router# Router(config-controller)# exit | Returns to the global configuration mode. |
Step 4 | Router# Router(config)# exit | Returns to the privileged EXEC mode. |
To verify that the T1/E1 controller is disabled:
Router# show controllers t1 T1 4/1 is administratively down.No alarms detected. Framing is ESF, Line Code is AMI, Clock Source is Line Data 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 Secs
Total 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
After the network module has been hot swapped, enable its T1/E1 controller.
Step 1 | Router (config)# controller t1 slot/port | Enter controller configuration mode and specify the location of the controller associated with the analog or digital modem network module that will be hot swapped. The slot value indicates the router slot position of the installed network module. Depending on the router, enter a slot value from 0 to 3. The port value indicates the T1 or E1 link that you are configuring. Cisco IOS software creates the interfaces automatically when a module is installed. |
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Step 2 | Router(config-controller)# no shutdown | This command enables the interfaces on the controller. |
Step 3 | Router# Router(config-controller)# exit | Returns to the global configuration mode. |
Step 4 | Router# Router(config)# exit | Returns to the privileged EXEC mode. |
To verify that the T1/E1 controller is enabled:
Router# show controllers t1 T1 4/1 is up.No alarms detected. Framing is ESF, Line Code is AMI, Clock Source is Line Data 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 Secs
Total 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
This section provides configuration examples for the different components in your system.
If your system contains an analog modem network module, you must configure the group asynchronous interface and the line.
interface Group-Async1 ip address negotiated no ip directed-broadcast encapsulation ppp dialer in-band dialer idle-timeout 512 either dialer-group 1 async default routing async mode dedicated no peer default ip address no fair-queue no cdp enable ppp authentication chap group-range 97 112 hold-queue 10 in
dialer-list 1 protocol ip permit
line 97 112 exec-timeout 0 0 autoselect ppp script dialer dial login local modem InOut transport input all stopbits 1 flowcontrol hardware
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.
controller T1 1/0 framing esf linecode b8zs pri-group timeslots 1-24
interface Serial1/0:23 no ip address no ip directed-broadcast isdn switch-type primary-5ess isdn incoming-voice modem no fair-queue no cdp enable
interface Group-Async1 no ip address no ip directed-broadcast encapsulation ppp load-interval 30 dialer in-band dialer pool-member 1 async mode dedicated no fair-queue no cdp enable ppp authentication chap group-range 97 120
interface Dialer1 ip address 199.0.1.2 255.255.255.0 no ip redirects no ip directed-broadcast no ip proxy-arp encapsulation ppp load-interval 30 dialer remote-name d1 dialer pool 1 dialer idle-timeout 7200 either dialer-group 1 no fair-queue pulse-time 0 no cdp enable
dialer-list 1 protocol ip permit
line 97 120 exec-timeout 0 0 modem InOut transport input all
There are no new or changed commands.
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.
Posted: Wed May 31 07:49:51 PDT 2000
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