Symptom

show ipv6 traffic showing reassembly failure for successfully reassembled ipv6 fragments in ping6 to/from supervisor on nexus switch. `show ipv6 traffic` RFC 4293: IPV6 Software Processed Traffic Statistics ---------------------------------------- Reception Pkts recv: 155, Bytes recv: 25898, inhdrerrors: 0, innoroutes: 0, inaddrerrors: 0, inunknownprotos: 0, intruncatedpkts: 0, inforwdgrams: 0, reasmreqds: 18, reasmoks: 9, reasmfails: 9, <<< increments equally both values indiscards: 0, indelivers: 258, inmcastpkts: 125, inmcastbytes: 10222, Transmission Pkts sent: 154, Bytes sent: 25910 outrequests: 147, outnoroutes: 0, outforwdgrams: 0, outdiscards: 0, outfragreqds: 0, outfragoks: 9, outfragfails: 0, outfragcreates: 18, outtransmits: 154, outmcastpkts: 125, outmcastbytes: 10126 Send 10 more ping6: N9K3(config)# ping6 2001:100:100::1 packet-size 1400 count 10 PING6 2001:100:100::1 (2001:100:100::1): 1400 data bytes 1408 bytes from 2001:100:100::1: icmp_seq=0 time=2.418 ms 1408 bytes from 2001:100:100::1: icmp_seq=1 time=1.605 ms 1408 bytes from 2001:100:100::1: icmp_seq=2 time=2.354 ms 1408 bytes from 2001:100:100::1: icmp_seq=3 time=1.578 ms 1408 bytes from 2001:100:100::1: icmp_seq=4 time=1.493 ms 1408 bytes from 2001:100:100::1: icmp_seq=5 time=1.525 ms 1408 bytes from 2001:100:100::1: icmp_seq=6 time=1.6 ms 1408 bytes from 2001:100:100::1: icmp_seq=7 time=1.503 ms 1408 bytes from 2001:100:100::1: icmp_seq=8 time=1.52 ms 1408 bytes from 2001:100:100::1: icmp_seq=9 time=1.491 ms --- 2001:100:100::1 ping6 statistics --- 10 packets transmitted, 10 packets received, 0.00% packet loss round-trip min/avg/max = 1.491/1.708/2.418 ms N9K3(config)# show ipv6 traffic IPv6 Software Processed Traffic and Error Statistics, last reset: never RP-Traffic Statistics: Counter Unicast Multicast ------- ------- --------- Packets forwarded: 0 0 Bytes forwarded: 0 0 Packets originated: 49 203 Bytes originated: 31706 20020 Packets consumed: 31 198 Bytes consumed: 6396 16086 Fragments originated: 38 0 Fragments consumed: 38 0 Ingress mcec forward packets: 0 Ingress packets during Vinci migration : 0 ICMPv6 Unreachable Exception Drops: 0 Error Statistics: Bad version: 0, route lookup failed: 0, hop limit exceeded: 0 Ingress Drop (ifmgr init): 0, rpf drops: 0 Option header errors: 0, payload length too small: 0 PM errors: 0, MBUF errors: 0, encapsulation errors: 2 Destination interface down drop: 0 RFC 4293: IPV6 Software Processed Traffic Statistics ---------------------------------------- Reception Pkts recv: 255, Bytes recv: 47362, inhdrerrors: 0, innoroutes: 0, inaddrerrors: 0, inunknownprotos: 0, intruncatedpkts: 0, inforwdgrams: 0, reasmreqds: 38, reasmoks: 19, reasmfails: 19, <<< incremented both by 10 for reception, all ping6 worked indiscards: 0, indelivers: 427, inmcastpkts: 205, inmcastbytes: 16646, Transmission Pkts sent: 252, Bytes sent: 47190 outrequests: 235, outnoroutes: 0, outforwdgrams: 0, outdiscards: 0, outfragreqds: 0, outfragoks: 19, outfragfails: 0, outfragcreates: 38, outtransmits: 252, outmcastpkts: 203, outmcastbytes: 16366

Conditions

ping6 to/from supervisor which requires fragmentation and reassembly

Workaround

N/A

Further Problem Description