On Thu, Jan 21, 2021 at 08:20:16PM +0100, Alexander Constantinescu wrote: > 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.
I think that the problem is that groups 3 and 4 don't have any liveness criteria defined, so they are always considered live. Try adding a watch_port to each of them. _______________________________________________ discuss mailing list disc...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-discuss