I am using the linux-cp plugin in VPP (v21.06) and run into issues with
multicast packet from OSPF.
I try to make FRR work with VPP. I created a lcp pair (ETH2-VPP2), ETH2
directly connect to router using OSPF.
FRR------VPP (192.168.100.5)----------Router (192.168.100.20)
VPP2 ETH2 ETH1
vppctl lcp create tn-eth2 host-if vpp2 netns t3-tap-ns
ip netns exec t3-tap-ns ip addr add 192.168.100.5/24 dev vpp2
ip netns exec t3-tap-ns ip link set dev vpp2 up
When I do tshark on Router ETH1, I can see hello packets from both sides, i.e.
192.168.100.5->224.0.0.5 and 192.168.100.20->224.0.0.5.
But when do tshark on VPP2, I can only see hello packets from
192.168.100.5->224.0.0.5. Seems VPP didn't forward multicast packets to VPP2.
When I do packet trace, this is what I got:
01:21:34:796763: dpdk-input
tn-eth2 rx queue 0
buffer 0x93b1f: current data 0, length 82, buffer-pool 0, ref-count 1,
totlen-nifb 0, trace handle 0x0
ext-hdr-valid
l4-cksum-computed l4-cksum-correct
PKT MBUF: port 2, nb_segs 1, pkt_len 82
buf_len 2176, data_len 82, ol_flags 0x0, data_off 128, phys_addr 0xb20ec840
packet_type 0x0 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0
rss 0x0 fdir.hi 0x0 fdir.lo 0x0
IP4: fa:16:3f:a9:2c:cc -> 01:00:5e:00:00:05
OSPF: 192.168.100.20 -> 224.0.0.5
tos 0xc0, ttl 1, length 68, checksum 0xf102 dscp CS6 ecn NON_ECN
fragment id 0xc2dc
01:21:34:796805: ethernet-input
frame: flags 0x1, hw-if-index 3, sw-if-index 3
IP4: fa:16:3f:a9:2c:cc -> 01:00:5e:00:00:05
01:21:34:796836: ip4-input
OSPF: 192.168.100.20 -> 224.0.0.5
tos 0xc0, ttl 1, length 68, checksum 0xf102 dscp CS6 ecn NON_ECN
fragment id 0xc2dc
01:21:34:796842: ip4-mfib-forward-lookup
fib 0 entry 0
01:21:34:796846: ip4-mfib-forward-rpf
entry 0 itf -1 flags
01:21:34:796847: ip4-drop
OSPF: 192.168.100.20 -> 224.0.0.5
tos 0xc0, ttl 1, length 68, checksum 0xf102 dscp CS6 ecn NON_ECN
fragment id 0xc2dc
01:21:34:796849: error-drop
rx:tn-eth2
01:21:34:796853: drop
ip4-input: Multicast RPF check failed
Do I need to do anything special for multicast packets to be directed to the
TAP interface?
Regards,
Wei
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