![]() “”Įrror vmware-vum-server sub=httpDownload] curl_easy_perform() failed: cURL Error: SSL connect error, error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocolġ) for its updates = vcsa use old policy and proxy working and upgrade vcenter correct download.Ģ) for lifecycle and skyline vcsa use = new policy and proxy not workingĮrror: SSL23_GET_SERVER_HELLO:unknown protocol Sync update generate errore with lifecycle:ĭownload patch definitions task failed while syncing depots. Overall, I'm wondering what could have been the decision to make this change.Vcenter 7u3e uses with lifecycle the new connection policies that do not work with some proxies. But it's shifting the MAC learning process to Spine node. As per my understanding the only optimization occurring here is on leaf node as they don't need to learn the MAC address of hundred thousand endpoints (only the local endpoints to itself). IMHO, the standard Non-ACI implementation of VxLAN seems to be much better in handling the unknown unicast than ACI. ![]() ![]() Am I correct in my understanding :ġ) MP-BGP EVPN is just used to advertise the external routing information into the fabric?Ģ) Unknown Unicast traffic handling is performed by the Spine switch (in the event we are using Hardware Proxy feature. There are few cases where in the endpoint is a "Silent" host & leaf nodes would be unaware of the endpoint information & hence multicast is being used to figure out these type of endpoints.īut with ACI the BUM traffic handling seems to have changed. As per my understanding, as soon as the endpoint is connected to a leaf node, the endpoint information is captured by the node (using ARP, CDP information etc.) & sent by the leaf node as a BGP update to all other leaf nodes in the fabric. In the standard VxLAN implementations with MP-BGP EVPN, the case of unknown unicast is cut down to a large extent in the way the endpoint information is handled. But thought relevant to discuss on this one. Thank you for using the ACI Cisco Support Community!įirstly sorry for re-opening a very old thread. The advantage of disabling hardware-based proxy and using flooding for unknown hosts and ARP is that the fabric does not need to learn millions of source IP addresses coming from a given port.Ĭisco Application Centric Infrastructure Design Guide With hardware proxy disabled and without unicast and ARP flooding, Layer 2 switching would not work. Hardware proxy and unknown unicast and ARP flooding are two opposite modes of operation. This mode of operation is equivalent to that of a regular Layer 2 switch, except that in Cisco ACI this traffic is transported in the fabric as a Layer 3 frame with all the benefits of Layer 2 multipathing, fast convergence, and so on. By enabling ARP flooding, ARP traffic is also flooded. By default, ARP traffic is not flooded but sent to the destination endpoint. However, if the fabric had to learn all the IP addresses coming from the Internet, it would clearly not scale.Īlternatively, you can enable flooding mode: if the destination MAC address is not known, flood in the bridge domain. With Cisco ACI, however, this is not a concern for virtual and physical servers that are part of the fabric: the database is built for scalability to millions of endpoints. The potential disadvantage is that the fabric has to learn all the endpoint addresses. The advantage of the hardware proxy mode is that no flooding occurs in the fabric. ![]() This behavior is controlled by the hardware proxy option associated with a bridge domain: if the destination is not known, send the packet to the spine proxy if the spine proxy also does not know the address, discard the packet (default mode). The TTL is not decremented for Layer 2 traffic, and the MAC addresses of the source and destination endpoints are preserved.īy default, Layer 2 unknown unicast traffic is sent to the spine proxy. Cisco ACI preserves the Layer 2 forwarding semantics even if the traffic is routed on the fabric. The bridge domain can be compared to a giant distributed switch.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |