Sanjeev, Please see answers inline. You may want to also check out https://cwiki.apache.org/confluence/display/CLOUDSTACK/OVS+Tunnel+Manager+f or+CloudStack for general limitation etc.
Some of the question are good points that needed to be in FS, I will add them where ever appropriate. On 09/04/14 4:54 AM, "Sanjeev Neelarapu" <sanjeev.neelar...@citrix.com> wrote: >Hi , > >Following are the review comments on the FS posted @ >https://cwiki.apache.org/confluence/display/CLOUDSTACK/Region+level+VPC+an >d >+guest+network+spanning+multiple+zones: > >How many guest networks we can scale using SDN? We could have theoretical maximum of 2^32 -1 GRE keys, so if CloudStack can spin up networks in that order, there should not be any limitation from OVS to create overlay networks. >Do we support mixed networks in a zone (VLAN+Tunnel)? Yes its possible to use VLAN and overlay networks in same zone. There is no constraint preventing. >Any limitation on the number of zones an SDN network can span? No >What are the services supported by SDN networks? >What are the services supported by region level VPC? There is no restriction on the services supported. Think OVS overlay networking solution as a L2/L3 solution. You can still choose all the services available for VLAN networks. >With SDN networks do we support any external devices? No not at the moment as external devices can not understand tunnelled (GRE) traffic. >Do we support SGs with SDN? No. >Do we support monitoring for SDN controller and the GRE tunnels between >the hosts across zones? There is no real-time status gathering if tunnelling functioning as expected. Ideally once you establish tunnel it should just work as seamlessly as VLAN's. >What are the alerts and events generated by the controller? None. >With SDNs do we support zones with mixed hypervisors?(e.g: zone1 with xen >and zone2 with ESX) Only XenServer, KVM are supported. >If vpc is tied to a zone can we have the tiers spanned across multiple >zones? Yes >If vpc is region level do we have control on the zone in which VR has to >be deployed? Yes, you still have start creating a VPC in a zone/ >Networks spanning across multiple zones is applicable only to vpc >networks(tiers) or any guest network which is not part of vpc as well? Both for the VPC tiers and regular isolated/shared networks. >Do we support SDNs in an upgraded environment? Yes >Can we upgrade vlan based networks to SDN and vice-versa? Yes, its possible >Upgrading zone level vpc to region level vpc and vice-versa? No >What are the external dependencies for the SDN to work (ports need to be >opened on the zone level firewalls)? Yes, GRE traffic need to be permuted across the zones.
