Path Of A Packet In The Egress Direction; Displaying The Spa Hardware Type; Example Of The Show Interfaces Command - Cisco ASR 1000 Configuration Manual
Aggregation services routers sip and spa software
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Displaying the SPA Hardware Type
2.
3.
4.
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.
2.
3.
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
Gigabit Ethernet SPA that is supported on the Cisco ASR 1000 Series Routers.
Table 9-2
SPA
4-Port Fast Ethernet SPA
8-Port Fast Ethernet SPA
10-Port Gigabit Ethernet SPA
8-Port Gigabit Ethernet SPA
5-Port Gigabit Ethernet SPA
2-Port Gigabit Ethernet SPA
1-Port 10-Gigabit Ethernet SPA
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)
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
9-8
For ten-Gigabit Ethernet SPAs, the XFP PHY device processes the frame and sends it over a serial
interface to the MAC device.
The MAC device receives the frame, strips the CRCs, and sends the packet via the SPI 4.2 bus to the
ASIC.
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.
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.
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.
For Gigabit Ethernet SPAs, the MAC device forwards the packets to the PHY laser-optic interface,
which transmits the packet.
shows the hardware description that appears in the show interfaces command output for each
SPA Hardware Descriptions in show Commands
Chapter 9
Overview of the Ethernet SPAs
Description in show interfaces Command
Hardware is SPA-4X1FE-TX-V2
Hardware is SPA-8X1FE-TX-V2
Hardware is SPA-10X1GE-V2
Hardware is SPA-8X1GE-v2
Hardware is SPA-5X1GE-V2
Hardware is SPA-2X1GE-V2
Hardware is SPA-1X10GE-L-V2
OL-14127-08
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Troubleshooting
