Dear VPP community, I'm trying to set up IS-IS neighborship with node running VPP22.10 + LCP plugin + FRR as control plane software, with no results.
What I can see, looks like VPP does not pass IIH packet between network and TAP interface, both directions. On node running VPP, when tcpdumping host TAP interface I see outgoing IS-IS IIHs: 15:12:27.195439 3c:ec:ef:5f:77:8f > 09:00:2b:00:00:05, 802.3, length 1500: LLC, dsap OSI (0xfe) Individual, ssap OSI (0xfe) Command, ctrl 0x03: OSI NLPID IS-IS (0x83): p2p IIH, src-id 0000.0000.0001, length 1497 They are not appears on opposite node (it runs frr/isisd without VPP). Only outgoing IIH packets are seen. 15:29:13.192912 3c:ec:ef:5f:78:7a > 09:00:2b:00:00:05, 802.3, length 1500: LLC, dsap OSI (0xfe) Individual, ssap OSI (0xfe) Command, ctrl 0x03: OSI NLPID IS-IS (0x83): p2p IIH, src-id 0000.0000.0002, length 1497 15:29:15.942959 3c:ec:ef:5f:78:7a > 09:00:2b:00:00:05, 802.3, length 1500: LLC, dsap OSI (0xfe) Individual, ssap OSI (0xfe) Command, ctrl 0x03: OSI NLPID IS-IS (0x83): p2p IIH, src-id 0000.0000.0002, length 1497 Meanwhile, IP connectivity between the nodes exist. Here you can see ICMP exchane, as we can see it on TAP interface of VPP host 15:24:15.169021 3c:ec:ef:5f:77:8f > 3c:ec:ef:5f:78:7a, ethertype IPv4 (0x0800), length 98: 10.114.1.1 > 10.114.1.100: ICMP echo request, id 144, seq 12, length 64 15:24:15.169275 3c:ec:ef:5f:78:7a > 3c:ec:ef:5f:77:8f, ethertype IPv4 (0x0800), length 98: 10.114.1.100 > 10.114.1.1: ICMP echo reply, id 144, seq 12, length 64 15:24:15.329025 3c:ec:ef:5f:77:8f > 3c:ec:ef:5f:78:7a, ethertype IPv4 (0x0800), length 98: 10.114.1.1 > 10.114.1.100: ICMP echo request, id 122, seq 61503, length 64 15:24:15.329304 3c:ec:ef:5f:78:7a > 3c:ec:ef:5f:77:8f, ethertype IPv4 (0x0800), length 98: 10.114.1.100 > 10.114.1.1: ICMP echo reply, id 122, seq 61503, length 64 OSPF neighborship also can be established, so problem is IS-IS related. tn3# show ipv6 ospf6 neighbor Neighbor ID Pri DeadTime State/IfState Duration I/F[State] 20.20.20.1 1 00:00:38 Full/DR 00:07:21 Ten0.1914[BDR] tn3# What I found, show node counters says osi-input unknown osi protocol increasing. Count Node Reason Severity 84 lldp-input lldp packets received on disabled i error 4364 dpdk-input no error error 20 arp-reply ARP replies sent info 9 arp-reply IP4 source address matches local in error 19 arp-reply ARP request IP4 source address lear info 43 arp-disabled ARP Disabled error 1252 osi-input unknown osi protocol error 4 ip6-input ip6 source lookup miss error 19 ip6-local-hop-by-hop Unknown protocol ip6 local h-b-h pa error 10 ip4-local ip4 source lookup miss error 4 ip6-icmp-input neighbor solicitations for unknown error 4 ip6-icmp-input neighbor advertisements sent info 106 ip6-icmp-input neighbor discovery not configured error 42 snap-input unknown oui/snap protocol error 49 ethernet-input unknown ethernet type error 623375 ethernet-input unknown vlan error 1 ethernet-input subinterface down error On the other hand, I can see IS-IS protocol in src/vnet/osi/osi.h #define foreach_osi_protocol \ _ (null, 0x0) \ _ (x_29, 0x01) \ _ (x_633, 0x03) \ _ (q_931, 0x08) \ _ (q_933, 0x08) \ _ (q_2931, 0x09) \ _ (q_2119, 0x0c) \ _ (snap, 0x80) \ _ (clnp, 0x81) \ _ (esis, 0x82) \ _ (isis, 0x83) \ _ (idrp, 0x85) \ _ (x25_esis, 0x8a) \ _ (iso10030, 0x8c) \ _ (iso11577, 0x8d) \ _ (ip6, 0x8e) \ _ (compressed, 0xb0) \ _ (sndcf, 0xc1) \ _ (ip4, 0xcc) \ _ (ppp, 0xcf) So protocol should not be "unknown". Any ideas where I need to look at to fix the issue with IS-IS?
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