Cisco ASR 1000 Configuration Guide

9-8
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
OL-14127-08
Chapter 9 Overview of the Ethernet SPAs
Displaying the SPA Hardware Type
2. For ten-Gigabit Ethernet SPAs, the XFP PHY device processes the frame and sends it over a serial
interface to the MAC device.
3. The MAC device receives the frame, strips the CRCs, and sends the packet via the SPI 4.2 bus to the
ASIC.
4. The ASIC takes the packet from the MAC devices and classifies the Ethernet information. CAM
lookups based on Ethertype, port, VLAN, and source and destination address information determine
whether the packet is dropped or forwarded to the SPA interface.
Path of a Packet in the Egress Direction
The following steps describe the path of an egress packet from the SIP through the Gigabit Ethernet
SPAs:
1. The packet is sent to the ASIC using the SPI 4.2 bus. The packets are received with Layer 2 and
Layer 3 headers in addition to the packet data.
2. The ASIC uses port number, destination MAC address, destination address type, and VLAN ID to
perform parallel CAM lookups. If the packet is forwarded, it is forwarded via the SPI 4.2 bus to the
MAC device.
3. For Gigabit Ethernet SPAs, the MAC device forwards the packets to the PHY laser-optic interface,
which transmits the packet.
Displaying the SPA Hardware Type
To verify the SPA hardware type that is installed in your Cisco ASR 1000 Series Routers, you can use
the show platform command.
Table 9-2 shows the hardware description that appears in the show interfaces command output for each
Gigabit Ethernet SPA that is supported on the Cisco ASR 1000 Series Routers.
Example of the show interfaces Command
The following example shows output from the show interfaces tengigabitethernet command on a Cisco
ASR 1000 Series Routers with a 1-Port 10-Gigabit Ethernet SPA installed in slot 7:
Router# show interfaces tengigabitethernet7/0/0
TenGigabitEthernet0/0/0 is up, line protocol is up (connected)
Ta b l e 9-2 SPA Hardware Descriptions in show Commands
SPA Description in show interfaces Command
4-Port Fast Ethernet SPA Hardware is SPA-4X1FE-TX-V2
8-Port Fast Ethernet SPA Hardware is SPA-8X1FE-TX-V2
10-Port Gigabit Ethernet SPA Hardware is SPA-10X1GE-V2
8-Port Gigabit Ethernet SPA Hardware is SPA-8X1GE-v2
5-Port Gigabit Ethernet SPA Hardware is SPA-5X1GE-V2
2-Port Gigabit Ethernet SPA Hardware is SPA-2X1GE-V2
1-Port 10-Gigabit Ethernet SPA Hardware is SPA-1X10GE-L-V2

Cisco ASR 1000 Specifications

General

Brand	Cisco
Model	ASR 1000
Category	Network Router
Language	English