Packet Capture in Leaf

[snarayanaraju]

Hi All - Trying to understand the trigger command in ACI Leaf. For example, I am trying to capture from source 1.1.1.1 to destination 2.2.2.2. The below commands I use 

Leaf01#vsh_lc

module-1# debug platform internal tah elam asic 0
module-1(DBG-elam)# trigger reset
module-1(DBG-elam)# trigger init in-select 6 out-select 1
module-1(DBG-elam-insel6)# set outer ipv4 src_ip 1.1.1.1 dst_ip 2.2.2.2
module-1(DBG-elam-insel6)# start

Question: What is the meaning of the "Outer" keyword in this example. On what scenario I have to use Inner. Example, what will be the result if I use the command "set inner ipv4 src_ip 1.1.1.1 dst_ip 2.2.2.2"

Thanks, Sairam

[Hector Gustavo Serrano Gutierrez]

Hi @snarayanaraju,

In this ELAM context, inner refers to the inner IP Source and IP Destination of VXLAN encapsulated traffic. In ACI, traffic between Spines and Leaf switches is VXLAN encapsulated. There, the outer IP Source and IP Destination are the TEP addresses and the inner IP Source and IP Destination are the EndPoints. This ELAM trigger can be used for instance on Leaf Switches on uplink ports (connected to Spines) where traffic is expected to be received as VXLAN encapsulated.

Another example is when you are set VXLAN encap on front ports on Leaf Switches.

Hope this helps.

[snarayanaraju]

Thank you Sir - I am interested to learn the traffic on the front panel ports of the ACI Leaf Switches. In this context should i use the "inner" key word or "outer" key word. 

The Front Panel ports are connected to baremetal servers or VM machines. No VXLAN on southbound.

Thanks and regards,Sairam 

[Sergiu.Daniluk]

Hi @snarayanaraju 

There is a pretty good example and explanation here: https://www.cisco.com/c/en/us/support/docs/cloud-systems-management/application-policy-infrastructure-controller-apic/213346-ex-hardware-aci-packet-forwarding-deep.html 

Cheers,

Sergiu

[SulthanGhazali]

Hi All,

I want to ask, what different between "debug platform internal roc elam asic 0" and "debug platform internal tah elam asic 0"

[Sergiu.Daniluk]

That is the ASIC family name: tah = tahoe; roc = rocky

Within a ASIC family there are multiple models of ASICs, with different buffer size, capabilites etc:

Tahoe:
Sugarbowl: 93XX-EX, 97XX-E/EX
Lacrosse: 92XX, C950X-FM-E
Davos: 92160YC

Rocky:
Homewood: F/FX/FXP
Bigsky: 9364C,C950X-FM-E2
Heavenly: FX2

Cheers,

Sergiu