|
|
This chapter describes the Operation, Administration, and Maintenance (OAM) implementation of the LightStream 1010 ATM Switch. OAM performs fault management and performance management functions at asynchronous transfer mode (ATM) management (M)-plane layer.
Note Current OAM implementation supports only the fault management function which includes connectivity verification and alarm surveillance.
The LightStream 1010 has full support for the following ATM OAM cell flows:
Both F4 and F5 flows can be configured as either end-to-end or segment-loopback and used with alarm indication signal (AIS) and remote defect indication (RDI) functions.
Over and above the standard OAM functions, the LightStream 1010 also has the added capability to send OAM packet internet gropers (PINGs). OAM cells containing the ATM node addresses or internet protocol (IP) addresses of intermediate switches allow network administrators to determine the integrity of a chosen connection at any intermediate point along the connection. This allows network connection debugging and troubleshooting.
OAM software implements ATM layer F4 and F5 OAM fault management functions. OAM performs standard loopback (end-to-end or segment) and fault detection and notification (AIS and RDI) for each connection. It also maintains a group of timers for the OAM functions. When there is an OAM state change such as loopback failure, OAM software notifies the connection management software. The network operator can enable or disable OAM operation for the following switch components:
If OAM operation is disabled, outgoing OAM cells will not be generated and all incoming OAM cells will be discarded.
In order to support various OAM operations, the LightStream 1010 switch hardware provides OAM cell routing functions on a per-connection basis for each direction and for different OAM cell spans (segment and end-to-end). The hardware OAM cell routing determines the destination of an OAM cell received from the link or the network and then determines whether or not OAM cells will be processed by the LightStream 1010 software.
The hardware can perform the following functions on OAM cells:
Intercept—Intercepted to the CPU queue and processed by the LightStream 1010 software.
Relay—Relayed along user cell by hardware without any software processing .
Discard—Discarded by hardware.
An ATM connection consists of a group of network points which are the edges of each ATM switch or end systems.
Each point can be one of the following:
Connection-End Point—The end of a connection where the user ATM cells are terminated.
Segment-End Point—The end of a connection segment.
Connecting Point—The middle point of a connection segment.
The following sections describe the Operations, Administration, and Maintenance tasks:
This section describes OAM commands in EXEC, global, and interface configuration mode.
OAM AIS, RDI and loopback operations are enabled or disabled for the entire switch using the EXEC commands. Use the optional interface atm parameter to configure OAM on a specific connection.
| Task | Command |
|---|---|
At the privileged EXEC prompt, enter configuration mode from the terminal. |
|
atm oam [interface atm card/sub-card/port] [ais] [end-to-end-loopback] [max-limit] [rdi] [seg-loopback] |
| 1This command is documented in the LightStream 1010 ATM Switch Command Reference publication. |
Use the no form of these commands to disable.
The following example enables AIS and segment-loopback for the entire switch:
Number of maximum OAM configured connections allowed range from 1 to 3200. Default is 3200.
Global configuration commands for the LightStream 1010 OAM are listed below
| 1This command is documented in the LightStream 1010 ATM Switch Command Reference publication. |
.
OAM AIS, RDI and Loopback operations are enabled or disabled with respect to switch.
The following example enables AIS and RDI for the entire switch:
The following example enables segment loopback and end-to-end loopback for the entire switch:
The following example disables the OAM ATM maximum count back to the default for the entire switch:
The following example configures the ATM OAM connection maximum to 1600:
Configuration commands for the LightStream 1010 OAM at the interface configuration level are listed below.
| Task | Command |
|---|---|
At the privileged EXEC prompt, enter configuration mode from the terminal. |
|
atm oam [segment-loopback] [end-to-end-loopback] [ais] [rdi] |
|
| 1This command is documented in the LightStream 1010 ATM Switch Command Reference publication. |
The following example enables OAM AIS end-loopback on interface 3/0/0:
Enable or disable OAM AIS, RDI and Loopback operation respective to a specified interface.
The following example enables interface 3/0/0, VPI=50, VCI=100 to allow OAM AIS at end and loopback:
Enable or disable OAM AIS, RDI and Loopback operation respective to a specified connection.
Note You can use only virtual path identifier (VPI) values to turn on OAM operations on VP connections.
In interface configuration command mode, you can enable or disable OAM operations on existing connections on different interfaces by specifying interface atm card/sub-card/port.
The following example disables OAM AIS flows at interface 3/0/0:
To check ATM connection reachability and network connectivity, use the atm ping command in either privilege or user level. You can use either an IP address or an ATM address prefix as a ping destination. You can also ping a neighbor switch by selecting the segment loopback option. In privilege extended command mode, you can select various other parameters such as repeat count and timeout values.
| 1This command is documented in the LightStream 1010 ATM Switch Command Reference publication. |
The following examples ping an ATM virtual channel connection (VCC) with a segment loopback signal in both normal and extended mode:
Note If you skip both destination IP address and the ATM prefix fields then extended PING will consider its neighbor switch as its destination and will use a segment loopback OAM cell. In IP address or ATM prefix case, PING will always use an end-to-end OAM loopback cell.
To display the OAM configuration, use the write terminal command.
The following show running-config command example displays the OAM configuration:
Posted: Mon Mar 10 10:53:47 PST 2003
All contents are Copyright © 1992--2002 Cisco Systems, Inc. All rights reserved.
Important Notices and Privacy Statement.