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.. _span_doc:
Switched Port Analyzer
======================
This is a memo intended to contain documentation of the VPP SPAN
implementation. Everything that is not directly obvious should come
here.
Port mirroring is used on a network switch to send a copy of network
packets seen on one switch port to a network monitoring connection on
another switch port. Can be used by network engineers or administrators
to measure performance, analyze and debug data or diagnose errors on a
network.
RX traffic node
~~~~~~~~~~~~~~~
There is one static node to mirror incoming packets. \* span-input:
Creates a copy of incoming buffer due to incoming buffers can be reused
internally.
Chaining: dpdk-input -> span-input -> \* original buffer is sent to
ethernet-input for processing \* buffer copy is sent to interface-output
Configuration
~~~~~~~~~~~~~
SPAN supports the following CLI configuration commands:
Enable/Disable SPAN (CLI)
^^^^^^^^^^^^^^^^^^^^^^^^^
::
set interface span <if-name> [disable | destination <if-name>]
: mirrored interface name destination : monitoring interface name
disable: delete mirroring
Enable/Disable SPAN (API)
^^^^^^^^^^^^^^^^^^^^^^^^^
SPAN supports the following API configuration command:
sw_interface_span_enable_disable src GigabitEthernet0/8/0 dst
GigabitEthernet0/9/0 sw_interface_span_enable_disable src_sw_if_index 1
dst_sw_if_index 2
src/src_sw_if_index: mirrored interface name dst/dst_sw_if_index:
monitoring interface name
Remove SPAN entry (API)
^^^^^^^^^^^^^^^^^^^^^^^
SPAN supports the following API configuration command:
sw_interface_span_enable_disable src_sw_if_index 1 dst_sw_if_index 2
disable
src_sw_if_index: mirrored interface name dst_sw_if_index: monitoring
interface name
Configuration example
~~~~~~~~~~~~~~~~~~~~~
Mirror all packets on interface GigabitEthernet0/10/0 to interface
GigabitEthernet0/11/0.
Configure IPv4 addresses on mirrored interface: set interface ip address
GigabitEthernet0/10/0 192.168.1.13/24 set interface state
GigabitEthernet0/10/0 up
Configure IPv4 addresses on monitoring interface: set interface ip
address GigabitEthernet0/11/0 192.168.2.13/24 set interface state
GigabitEthernet0/11/0 up
Configure SPAN set span src GigabitEthernet0/10/0 dst
GigabitEthernet0/11/0
Operational data
~~~~~~~~~~~~~~~~
Active SPAN mirroring CLI show command: show interfaces span
Active SPAN mirroring API dump command: sw_interface_span_dump
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