Cisco 3750-X NetFlow Support

Cisco’s Catalyst 3750-X now has NetFlow v9 support!!

Using the 3KX module pictured below, you can now configure Flexible NetFlow exports on the 3750-X.  To find out how, just read on…..

Flexible NetFlow Support

This new module supports NetFlow v9 and Flexible NetFlow.  NetFlow is implemented in hardware so there’s no impact at all on CPU.  Here’s an example of a flow record for the 3KX Network Module.


!
flow record NetFlow
match datalink mac source-address
match datalink mac destination-address
match ipv4 tos
match ipv4 ttl
match ipv4 protocol
match ipv4 source address
match ipv4 destination address
match transport source-port
match transport destination-port
collect interface input snmp
collect interface output snmp
collect counter bytes
collect counter packets
collect timestamp sys-uptime first
collect timestamp sys-uptime last
!


You’ll also want to enable both ingress and egress on the 10G uplink ports as they are the only interfaces on the 3KX that support NetFlow export.

!
interface TenGigabitEthernet1/1/1
switchport trunk encapsulation dot1q
switchport mode trunk
ip flow monitor NetFlow input
ip flow monitor NetFlow output
!
interface TenGigabitEthernet1/1/2
switchport trunk encapsulation dot1q
switchport mode trunk
ip flow monitor NetFlow input
ip flow monitor NetFlow output
!


The 3KX module also includes support for Cisco’s Smart Logging and Telemetry.

Cisco Smart Logging and Telemetry (SLT): This new technology exports NetFlow messages for traffic that is associated to a specific event on a switch (for example, an event triggered by an ACL-permitted or -denied packet).

Flexible NetFlow support….  Smart Logging and Telemetry support….  All you need now is a NetFlow Analyzer that supports FNF and SLT and provides in-depth NetFlow reporting and your Catalyst 3750-X has more than doubled in value.

Is this something you’re interested in?   Let us know what you think.