Exam 300-620 topic 1 question 57 discussion

CE. Wrong comments here, unclear why. 2 part to setup LACP & LB algorithm. LACP needs to be active, unclear why omitted here in discussion by someone, it is enhanced LAG policy, so part of question. Cannot be source IP (TEP is not changing), cannot be dst port - same for common services, cannot be dest IP - same destination VM. So fits source & dst mac.

It should be B and E.. We need to select a mode and this is LACP Active and we can select just one load balancing hash when we are creating a Port Channel Policy for VDS and since the vCenter has a lot of IPs inside it, the best choice it would be IP destination. Also, the source IP or MAC will be the same.

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/aci_virtual_edge/configuration/2-x/Cisco-ACI-Virtual-Edge-Configuration-Guide-202/Cisco-ACI-Virtual-Edge-Configuration-Guide-202_chapter_0100.html

i think it is D and E

BD, Cisco Application Centric Infrastructure Virtual Edge, VXLAN mode traffic always uses the source IP address as the TEP IP address. To ensure proper load balancing, we recommend the algorithm Source and Destination TCP/UDP Port. https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/aci_virtual_edge/configuration/2-x/Cisco-ACI-Virtual-Edge-Configuration-Guide-202/Cisco-ACI-Virtual-Edge-Configuration-Guide-202_chapter_0100.html

https://aci-lab.ciscolive.com/lab/pod10/acivmm/vmm-build LACP Standby will give chance to the Leaf switches to initiate LACP BPDUs, Loadbalancing will be more variable to many destinations (More random flows).

This is a vSwitch policy and they want network switches to initiate LACP negotiations -> LACP Standby. Traffic is flowing from a limited number of VMs to the rest of the network -> LB Mode: Destination IP/Port. LB Mode can be different in the opposite direction!

for me it is C and E based on this document: https://community.cisco.com/t5/data-center-and-cloud-knowledge-base/vmm-integration-with-enhanced-lacp/ta-p/4522997

possibly CE consider vmotion - The LAG group consists of two 10 Gigabit Ethernet links Cisco ACI considers the frequent move of an IP address from one MAC address to the other and potentially between ports as a misconfiguration. Features such as rogue endpoint control may quarantine the endpoints and raise a fault. https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/cisco-application-centric-infrastructure-design-guide.html

In my opinion, it must be D and E. Because usually source port is ephemeral port which changes all the time, as result deifferent hashes that put traffic across multiple links. Secondly LACP must be ACTIVE.

complicated but I agree

The answer is B and D. Explanarion: LACP Mode: LACP Standby - In LACP available only two modes - Active and Passive LACP Mode: Active its standard LACP mode LB Mode: Source and Destination MAC Address its a standard LACP balancing mode And question says: Which two enhanced LAG policies meet these requirements? (Choose two.) LB Mode: Destination IP Address and TCP/UDP Port LB Mode: Source IP Address and TCP/UDP Port This two modes are LACP enhanced balancing modes

everyone forgets that we're configuring the "remote" side of connection (DVS on servers). ergo, it has to be LACP Passive (here called "standby"), and best-from-provided load balancing decision would be destination ip + tcp/udp

We dont know if its a "normal VDS" or an "AVE". So maybe they want to point to the AVE due to (https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/aci_virtual_edge/configuration/2-x/Cisco-ACI-Virtual-Edge-Configuration-Guide-202/Cisco-ACI-Virtual-Edge-Configuration-Guide-202_chapter_0100.html) so because "For Cisco ACI Virtual Edge VXLAN mode, it is mandatory to use a load-balancing algorithm having a UDP port. We recommend the algorithm Source and Destination TCP/UDP Port." B and E should be correct

I think the anwsers are not complete. --> anwser should be LACP active / Src/Dst TCP/UDP Possible anwsers: SRC/DST MAC, SRC/DST IP, SRC/DST TCP/UDP and LACP active or passive

I think C and E. I think that B and D are not correct as there are no such options

there is no mode of lacp standby in the APIC settings. LACP Mode: LACP Standby - is wrong! In the Mode field, choose one of the following options appropriate to your setup: Static Channel - Mode On LACP Active LACP Passive MAC Pinning MAC Pinning-Physical-NIC-load but the answer options clearly state - LACP Standby.