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The Packet-Over-SONET OC3 port adapters (PA-POS-OC3SML, PA-POS-OC3SMI, and PA-POS-OC3MM) are available on Cisco 7000 series routers with the 7000 Series Route Switch Processor (RSP7000) and 7000 Series Chassis Interface (RSP7000CI), Cisco 7500 series routers, and Cisco 7200 series routers.
The POSIP and POS OC-3provide a single 155.520-Mbps, OC-3 physical layer interface for packet-based traffic. This OC-3 interface is fully compatible with SONET and Synchronous Digital Hierarchy (SDH) network facilities and is compliant with RFC 1619, "PPP over SONET/SDH," and RFC 1662, "PPP in HDLC-like Framing." The Packet-Over-SONET specification is primarily concerned with the use of the PPP encapsulation over SONET/SDH links.
For more information on the PA-POS-OC3 port adapter, refer to the PA-POS-OC3 Packet OC-3 Port Adapter Installation and Configuration publication that accompanies the hardware.
The POS-OC-3 port adapter provided the following benefits:
Command descriptions use these conventions:
This feature is supported on these platforms:
For information on how to configure a POS interface, refer to the following publications:
For information on other commands that can be used by the POS interface, refer to the Cisco IOS Release 12.0 configuration guides.
The following is an example of a POS interface located in slot 0, port adapter slot 0, port 0 in a Cisco 7500 series router:
Router# configure terminal Router (config)# interface POS0/0/0 Router (config-if)# ip address 10.1.1.4 255.255.255.0 Router (config-if)# ip route-cache distributed Router (config-if)# no keepalive Router (config-if)# clock source internal Router (config-if)# pos report rdool Router (config-if)# pos report lais Router (config-if)# pos report lrdi Router (config-if)# pos report pais Router (config-if)# pos report prdi Router (config-if)# pos report sd-ber Router (config-if)# no cdp enable Router (config-if)# end Router#
For additional examples of configuring a POS interface, refer to the following publications:
All commands used with this feature are documented in the following publications:
To specify the POS interface and enter interface configuration mode, use the interface pos global configuration command.
interface pos slot/port-adapter/port (on VIPs in Cisco 7000 series and Cisco 7500 series)
slot | Specifies the backplane slot number. |
port-adapter | On Cisco 7000 series and Cisco 7500 series routers, specifies the ports on a VIP card. The value must be 0. |
port | Port number on the interface. The value must be 0. |
None
Global configuration
This command first appeared in Cisco IOS Release 11.2.
This command was modified in Cisco IOS Release 11.2 P and 11.1 CA to change the interface posi command to interface pos.
This command was modified in Cisco IOS Release 11.1 CC to make the command description generic.
The following example specifies the single Packet OC-3 interface on the POS OC-3 port adapter in slot 2:
interface pos 2/0
To send the line alarm indication signal (LAIS) when the POS interface is placed in any administrative shut down state, use the pos ais-shut command. In Automatic Protection Switching (APS) environments, LAIS can be used to force a protection switch. This command forces an APS switch when the interface is placed in administrative shut down state.
pos ais-shutThis command has no keywords or arguments.
No line alarm indication signal (LAIS) is sent.
Interface Configuration
This command first appeared in Cisco Release 11.1 CC.
For more information on APS, refer to the following documents available on CCO:
The following example forces the alarm indication on the POS OC-3 interface 0 in slot 3:
interface pos 3/0 shutdown pos ais-shut
Posted: Tue Dec 21 15:48:58 PST 1999
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