|
|
This chapter describes the Operation, Administration, and Maintenance (OAM) implementation on the LightStream 1010 ATM switch, and includes the following sections:
OAM performs fault management and performance management functions at the ATM management (M)-plane layer.
The LightStream 1010 ATM switch 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.
In addition to the standard OAM functions, the LightStream 1010 ATM switch can also send OAM pings. OAM cells containing the ATM node addresses or IP addresses of intermediate switches allow network administrators to determine the integrity of a chosen connection at any intermediate point along the connection, allowing for 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 are not generated, and all incoming OAM cells are discarded.
To support various OAM operations, the LightStream 1010 ATM 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 OAM cells are processed by the switch software.
The hardware can perform the following functions on OAM cells:
An ATM connection consists of a group of network points that form the edges of each ATM switch or end system.
Each point can be one of the following:
The following sections describe the OAM tasks:
This section describes OAM commands in EXEC, global, and interface configuration mode.
To enable OAM operations for the entire switch, use the global configuration command, as shown in the following table:
| Command | Task |
|---|---|
atm oam [ais] [end-loopback] | OAM operations are enabled or disabled with respect to entire switch. |
The following example shows how to enable AIS and segment loopback for the entire switch:
Switch(config)# atm oam ais seg-loopback % OAM: Switch level seg loopback is enabled % OAM: Switch level ais is enabled
The following example shows how to configure the ATM OAM connection maximum to 1600:
Switch(config)# atm oam max-limit 1600
To enable OAM operations an interface, perform the following steps, beginning in global configuration mode:
| Step | Command | Task |
|---|---|---|
| 1 | interface atm card/subcard/port[.vpt #] | Select the interface to be configured. |
| 2 | atm oam [vpi [vci] | interface atm card/subcard/port[.vpt #]] [ais] [end-loopback] | Configure interface OAM operations. |
| 3 | atm oam vpi [vci] loopback-timer tx-timer-value | Configure the OAM loopback transmit timer. |
The following example shows how to enable OAM AIS end loopback on interface 3/0/0:
Switch(config)# interface atm 3/0/0 Switch(config-if)# atm oam ais end-loopback % OAM: Interface level end to end loopback is enabled % OAM: Interface level ais is enabled
The following example shows how to enable interface 3/0/0, VPI = 50, VCI = 100 to allow OAM AIS at the end and loopback:
Switch(config)# interface atm 3/0/0 Switch(config-if)# atm oam 50 100 ais end-loopback % OAM: Connection level end to end loopback is not enabled % OAM: Connection level ais is not enabled
Enable or disable OAM AIS, RDI, and loopback operations respective to a specified connection.
In interface configuration command mode, you can enable or disable OAM operations on existing connections on different interfaces by specifying interface atm card/subcard/port. The following example disables OAM AIS flows at interface 3/0/0:
Switch(config)# interface atm 3/0/0 Switch(config-if)# no atm oam ais % OAM: Interface level ais is disabled
To check ATM connection reachability and network connectivity, use the following EXEC command:
| Step | Command | Task |
|---|---|---|
| 1 | configure | At the privileged EXEC prompt, enter configuration mode from the terminal. |
| 2 | interface atm card/subcard/port [.vpt #] | Select the interface. |
| 3 | ping atm interface atm card/subcard/port vpi vci [atm-prefix prefix] | [end-loopback] | [ip-address address] | [seg-loopback] | Check the connection. |
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 privileged EXEC mode, you can select various other parameters such as repeat count and timeout values.
The following example shows the ping command used in normal mode to check a VCC with a segment loopback signal:
Switch# ping atm interface atm 3/0/0 50 100 seg-loopback Type escape sequence to abort. Sending Seg-Loopback 5, 53-byte OAM Echoes to a neighbor, timeout is 5 seconds: ..... Success rate is 0 percent (0/5)
The following example shows the ping command used in extended mode to check a VCC with a segment loopback signal:
Switch# ping Protocol [ip]: atm Interface [card/sub-card/port]: 3/0/0 VPI [0]: 0 VCI [0]: 16 Send OAM-Segment-Loopback ? [no]: Target IP address: Target NSAP Prefix: Repeat count [5]: Timeout in seconds [5]: Type escape sequence to abort. Sending end-Loopback 5, 53-byte OAM Echoes to a connection end point, timeout is 5 seconds: ..... Success rate is 0 percent (0/5)
To display the OAM configuration, use the following EXEC command:
| Command | Task |
|---|---|
Display the OAM configuration. |
The OAM configuration is displayed in the following example:
Switch# show running-config Building configuration... Current configuration: ! version XX.X no service pad service udp-small-servers service tcp-small-servers ! hostname Switch ! boot system flash slot0:rhino/ls1010-wi-m_1.083.bin.Z ! ip rcmd remote-username doug atm oam max-limit 1600 atm over-subscription-factor 16 atm service-category-limit cbr 3000 atm qos uni3-default cbr max-cell-loss-ratio 12 atm lecs-address 47.0091.0000.0000.0000.0000.0000.0000.0000.0000.00 atm address 47.0091.8100.0000.0060.3e5a.db01.0060.3e5a.db01.00 ! interface ATM0/0/0 no keepalive map-group atm-1 no atm auto-configuration no atm address-registration no atm ilmi-enable no atm ilmi-lecs-implied atm iisp side user atm pvp 99 atm oam 0 5 seg-loopback end-loopback rdi atm oam 0 16 seg-loopback end-loopback rdi atm oam 0 18 seg-loopback end-loopback rdi ! interface ATM0/0/0.99 point-to-point no atm auto-configuration no atm address-registration no atm ilmi-enable no atm ilmi-lecs-implied atm maxvp-number 0 atm oam 99 5 end-loopback rdi atm oam 99 16 end-loopback rdi atm oam 99 18 end-loopback rdi ! interface ATM0/0/1 no keepalive --More-- <information deleted>
|
|