Bonding cares less whether the traffic is unicast or multicast. It just hashes
the packet header and selects one of the members as the outgoing interface. The
only bonding mode which it replicates packets across all members is when you
create the bonding interface to do broadcast which you didn’t do in your config.
That said, you can debug further to see where the problem is by using packet
trace or pcap. You can also disable bonding to see if it helps.
Steven
From: <vpp-dev@lists.fd.io> on behalf of "ashish.sax...@hsc.com"
<ashish.sax...@hsc.com>
Date: Tuesday, December 1, 2020 at 11:40 PM
To: "vpp-dev@lists.fd.io" <vpp-dev@lists.fd.io>
Subject: [vpp-dev] multicast traffic getting duplicated in lacp bond mode
Hi vpp community,
We are using vpp 20.05 on our setup. We were testing out vpp bonding in lacp
mode. With this config, we saw that multicast traffic was getting duplicated.
However, the unicast traffic was ok without duplicate packets. Looks like maybe
2 joins are happening, one on each interface. We could not find anything on
documentation regarding this.
We have tested the below combinations:
xor
lacp
lcap+l34+passive
lcap+l34+no passive command
lcap+l23+pasive
lcap+l23+no passive
lcap+l2+passive
Config used for testing:
create bond mode xor id 0
bond add BondEthernet0 HundredGigabitEthernet12/0/1
create sub-interfaces BondEthernet0 501
set int state HundredGigabitEthernet12/0/1 up
set int state BondEthernet0 up
set int state BondEthernet0.501 up
set interface ip address BondEthernet0.501
2001:5b0:ffff:501:b883:31f:19e:68f1/64
bond add BondEthernet0 HundredGigabitEthernet12/0/0
create sub-interfaces BondEthernet0 701
set int state HundredGigabitEthernet12/0/0 up
set int state BondEthernet0 up
set int state BondEthernet0.701 up
ip6 nd address autoconfig BondEthernet0.701 default-route
Multicast route added:
ip mroute add FF38:23:2001:5B0:2000::9901/128 via BondEthernet0.501 Accept
ip mroute add FF38:23:2001:5B0:2000::9901/128 via local Forward
ip mroute add FF38:23:2001:5B0:2000::9900/128 via tuntap-0 Accept
ip mroute add FF38:23:2001:5B0:2000::9900/128 via BondEthernet0.501 Forward
Is this a known isssue ? How can we stop the duplicate packet?
Thanks and Regards,
Ashish
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