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Cisco Netflow on Sub-Interfaces

Hello Experts,

I never really understood if its necessary to configure netflow on sub-interfaces or just on the physical interface. For example, our WAN circuit is physically connected to Gi 0/0. We have sub-interface of Gi0/0/2928. Both interfaces are currently configured as follows:

interface GigabitEthernet0/0
no ip address
load-interval 30
duplex full
speed 10

interface GigabitEthernet0/0.2938
description BT MPLS CID SHI/CU-SHI/BT NP432 (supplier 2013-04655-k01)
encapsulation dot1Q 2938
ip address 10.1.243.38 255.255.255.252
no ip unreachables
ip flow ingress
ip flow egress
ip virtual-reassembly in
no cdp enable
service-policy output Shape-Ethernet-QoS
end

As you can see, netflow is configured on the sub-interface but we don't have it configured on our physical interface. Should we have it configured on both?

Regards

Carlton

ASKER CERTIFIED SOLUTION

Jody Lemoine

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eeRoot

Are there any other sub interfaces that you want to monitor? And do you want to monitor the L3 traffic that is going through the physical interface such as routing protocols and link status packets?

cpatte7372

ASKER

Hi Jody, thats great.

eeRoot, there are no other sub-interfaces I want to monitor.

Cheers

Jody Lemoine

Glad I could help. Is there anything else that needs clarification or are you good with the answers provided?

cpatte7372

ASKER

Cheers