Hi, TL;DR: I am wondering if there's any specific action/convention that needs to be defined for groups which are referenced by a watch_group, as to have the liveness check correctly working? FYI: I can't use a liveness check on a dedicated OVS port in this case.
I have not been able to find much documentation surrounding watch_group, the only doc I've been basing myself on is: http://www.openvswitch.org/support/dist-docs/ovs-ofctl.8.html I am working on a POC where the goal of my work is to load balance packets between two nexthops for packets matching a given flow. Essentially, I have this flow which gets hit: cookie=0x0, duration=12657.001s, table=100, n_packets=1423, n_bytes=113190, priority=100,ip,reg0=0x5d41f9 actions=group:2 for which I have the following groups defined: group_id=3,type=select,bucket=weight:100,actions=ct(commit),move:NXM_NX_REG0[]->NXM_NX_TUN_ID[0..31],set_field:172.19.0.2->tun_dst,output:vxlan0 group_id=2,type=select,bucket=weight:100,watch_group:3,actions=group:3,bucket=weight:100,watch_group:4,actions=group:4 group_id=4,type=select,bucket=weight:100,actions=ct(commit),move:NXM_NX_REG0[]->NXM_NX_TUN_ID[0..31],set_field:172.19.0.4->tun_dst,output:vxlan0 Group 2 thus load balances between group 3 (which forwards packets to nexthop 172.19.0.2) and 4 (corresponding to nexthop 172.19.0.4) in an equal way. The load balancing works, however the watch_group does not seem to have any impact, and what I mean by that is: if I shutdown the nodes corresponding to either of my nexthops, group 2 will still try to send packets to the nexthop (node) which I've just shut down. Honestly, I don't expect OVS to be able to determine the liveness of my group based off of what I've written....but I don't have any better idea of what to do. I am unable to tell if there's a specific action / convention that needs to be defined for groups which are referenced by a watch_group. Thanks in advance for any help! -- Best regards, Alexander Constantinescu Software Engineer, Openshift SDN Red Hat <https://www.redhat.com/> acons...@redhat.com <https://www.redhat.com/>
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