[Adding the public mailer so we all benefit] Hi Wei,
You need to add the multicast routes to VPP too. /neale From: Wei Huang <wei.hu.hu...@oracle.com> Date: Wednesday, 17 November 2021 at 03:57 To: nra...@cisco.com <nra...@cisco.com>, Neale Ranns <ne...@graphiant.com> Subject: VPP Linux-cp plugin with multicast packets Hi Neale I am using the linux-cp plugin you created 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 to an interface used to connect to other router using OSPF. FRR------VPP (192.168.100.5)----------Router (192.168.100.20) VPP2 ETH2 ETH1 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? Regards, Wei
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