Peter, > During testing we have hit an issue with our SRv6 tests and with Jumbo > packets of size 9000B. > Currently all 9K tests are not passing. It is not clear as of now when it was > the first time this issue appear as 9K tests are not frequently run. 78/1518B > tests are passing with no issue. > > Error example (see attachment for full output): > > return STDOUT Count Node Reason > 1379690 sr-pl-rewrite-encaps SR steered IPv6 packets > 1379690 ip6-input ip6 MTU exceeded > 1379690 ip6-icmp-error packet too big response sent > > Generated packet is 9000B (srv6 overhead should be 40B) > > Full VPP configuration attached as well as interface and error statistics. > VPP is not crashing so no core dumps available. > > NIC: Intel x520-da2 with MTU 9202 (per attachment) > > Can you please advise?
Isn't the error quite clear?
/* Check MTU of outgoing interface. */
ip6_mtu_check (p0, clib_net_to_host_u16 (ip0->payload_length) +
sizeof (ip6_header_t),
adj0[0].rewrite_header.max_l3_packet_bytes,
is_locally_originated0, &next0, &error0);
You are failing that check in ip6_forward.c
Size of packet is larger than the set maximum size in the adjacency.
Check the MTU in the adjacency table (and on the interfaces (with show
interfaces)).
Cheers,
Ole
>
> Thank you.
>
> Peter Mikus
> Engineer – Software
> Cisco Systems Limited
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