In the context of ACI Multi-Site, when is the information of an endpoint (MAC/IP) that belongs to site 1 advertised to site 2 using the EVPN control plane?
A.
Endpoint information is not exchanged across sites unless COOP protocol is used.
B.
Endpoint information is not exchanged across sites unless a policy is configured to allow communication across sites.
C.
Endpoint information is exchanged across sites as soon as the endpoint is discovered in one site.
D.
Endpoint information is exchanged across sites when the endpoints are discovered in both sites.
correct answer is B
The endpoint information is stored in the local COOP database. Spine nodes in site 1 know about locally connected endpoints, and the same is true for spine nodes in site 2. Note that at this point no information is exchanged across sites for EP1 and EP2 EPGs, because there is no policy in place yet indicating a need for those endpoints to communicate.
An intersite policy is defined in Cisco ACI Multi-Site Orchestrator and is then pushed and rendered in the two sites.
A COOP notification is generated inside each fabric from the leaf nodes on which EP1 and EP2 are discovered and sent to the local spine nodes.
The endpoint information is stored in the local COOP database. Spine nodes in site 1 know about locally connected endpoints, and the same is true for spine nodes in site 2. Note that at this point no information is exchanged across sites for EP1 and EP2 EPGs, because there is no policy in place yet indicating a need for those endpoints to communicate. Correct Answer : B
It is B
https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-739609.html#CiscoACIMultiSiteoverlaycontrolplane
B
https://www.cisco.com/c/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/white-paper-c11-739609.html#CiscoACIMultiSiteoverlaydataplane
The endpoint information is stored in the local COOP database. Spine nodes in site 1 know about locally connected endpoints, and the same is true for spine nodes in site 2. Note that at this point no information is exchanged across sites for EP1 and EP2 EPGs, because there is no policy in place yet indicating a need for those endpoints to communicate.
I think B is correct.
Coop are always used on spines, but not between multi sites. If traffic is allowed one spine in on site will forward the BUM packet to the remote site spines using anycast via EVPN and it will lookup like normal there. If there is a host it will return the answer back via EVPN and it's put in the local coop db. That is at least how I read the docs :-)
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