Hoi, Linux CP supports ARP, IPv4 and IPv6. ISIS uses its its own ethertype, as do other protocols (like LLDP for example). Those will not be punted into the TAP by the plugin (and it's difficult to uniquely identify the ethernet frames that should be punted as compared to being handled entirely in the dataplane).
groet, Pim On Mon, Jan 23, 2023 at 4:36 PM <agv...@gmail.com> wrote: > 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? > > > > > > -- Pim van Pelt <p...@ipng.nl> PBVP1-RIPE - http://www.ipng.nl/
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