Path Of A Packet In The Egress Direction; Displaying The Spa Hardware Type; Example Of The Show Interfaces Command - Cisco ASR 1000 Configuration Manual

Chapter 12 Overview of the POS SPAs

Path of a Packet in the Egress Direction

The following steps describe the path of an egress packet through the 1-Port OC-192c/STM-64 POS XFP
SPA:
1.
2.
3.
4.
5.
6.

Displaying the SPA Hardware Type

To verify information about the SPA hardware that is installed in your Cisco ASR 1000 Series Routers,
you can use the show interfaces command or the show controllers command. There are several other
commands on the Cisco ASR 1000 Series Routers that also provide SPA hardware information.
Table 12-2
that is supported on the Cisco ASR 1000 Series Routers.
Table 12-2
SPA
2-Port OC-3c/STM-1 POS SPA
4-Port OC-3c/STM-1 POS SPA
8-Port OC-3c/STM-1 POS SPA
1-Port OC-12c/STM-4 POS SPA
2-Port OC-12c/STM-4 POS SPA
4-Port OC-12c/STM-4 POS SPA
8-Port OC-12c/STM-4 POS SPA
1-Port OC-48c/STM-16 POS SPA
2-Port OC-48c/STM-16 POS/RPR SPA
4-Port OC-48c/STM-16 POS/RPR SPA
1-Port OC-192 POS-XFP SPA

Example of the show interfaces Command

The following example shows output from the show interfaces pos command on a Cisco ASR 1000
Series Router with a 1-Port OC-192c/STM-64 POS XFP SPA installed in slot 1:
Router# show interfaces POS1/0/0
POS1/0/0 is up, line protocol is up
Hardware is SPA-OC192POS-XFP
MTU 4470 bytes, BW 9952000 Kbit, DLY 100 usec,
Encapsulation HDLC, crc 16, loopback not set
OL-14127-08
The host sends packets to the SPA using the SPI4.2 bus.
The SPA stores the data in the appropriate channel's first-in first-out (FIFO) queue.
The SPA passes the packet to the framer.
The framer accepts the data and stores it in the appropriate channel queue.
The framer adds the FCS and SONET/SDH overhead.
The framer sends the data to the XFP optics for transmission onto the network.
shows the hardware description that appears in the show command output for each POS SPA
SPA Hardware Descriptions in show Commands
reliability 255/255, txload 1/255, rxload 1/255
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
Displaying the SPA Hardware Type
Description in show interfaces command
Hardware is Packet over Sonet
Hardware is Packet over Sonet
Hardware is Packet over Sonet
Hardware is Packet over Sonet
Hardware is Packet over Sonet
Hardware is Packet over Sonet
Hardware is Packet over Sonet
Hardware is Packet over Sonet
Hardware is Packet over Sonet
Hardware is Packet over Sonet
SPA-OC192POS-XFP
12-9