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Hi,

Max FCIP data frame size is 2152 bytes. A native fibre channel frame max size is 2148.
If your FCIP switch is not fragmenting packets (it is possible), then this would explain why you're seeing oversize packet errors with only 1500 byte MTU configured.

Kind regards,
--
Adam Gent

----- Original Message -----
From: "james list via juniper-nsp" <juniper-nsp@puck.nether.net>
To: "Juniper List" <juniper-nsp@puck.nether.net>
Sent: Tuesday, 8 August, 2023 11:52:40
Subject: [j-nsp] input errors on QFX5110

Dear experts,
a customer of mine has a Fiber Channel over IP switch connected to a port
QFX5110 port and sees a lot of "Input errors" and "oversize frames"

Input errors: Errors: 118467
Oversized frames 118467

below extensive output


Are those counters related to frames dropped or just a counter ?

The same machine connected to a previous QFX5100 (different Junos) does not
highlight the same counter.

Since the FCoIP switch manager sees packet loss and retransmissions and
states no jumbo frame should be needed, which is your idea of the issue ?

I see as well this:

Autonegotiation information:
Negotiation status: Incomplete

Thanks in advance
James


QFX5110A> show interfaces ge-0/0/0 extensive
Physical interface: ge-0/0/0, Enabled, Physical link is Up
Interface index: 652, SNMP ifIndex: 707, Generation: 145
Description: FCOIP
Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Speed: 1000mbps, BPDU
Error: None, Loop Detect PDU Error: None, Ethernet-Switching Error: None,
MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled,
Flow control: Disabled, Auto-negotiation: Enabled, Remote fault: Online,
Media type: Fiber,
IEEE 802.3az Energy Efficient Ethernet: Disabled, Auto-MDIX: Enabled
Device flags : Present Running
Interface flags: SNMP-Traps Internal: 0x4000
Link flags : None
CoS queues : 12 supported, 12 maximum usable queues
Hold-times : Up 0 ms, Down 0 ms
Current address: bc:7c:6c:23:11:03, Hardware address: bc:7c:6c:23:11:03
Last flapped : 2023-03-23 10:54:13 CET (19w5d 00:48 ago)
Statistics last cleared: 2023-08-08 10:56:52 CEST (01:45:26 ago)
Traffic statistics:
Input bytes : 40792860463 9378952 bps
Output bytes : 4232537714 4886680 bps
Input packets: 52096906 4710 pps
Output packets: 29620532 3841 pps
IPv6 transit statistics:
Input bytes : 0
Output bytes : 0
Input packets: 0
Output packets: 0
Input errors:
Errors: 118467, Drops: 0, Framing errors: 0, Runts: 0, Policed
discards: 0, L3 incompletes: 0, L2 channel errors: 0, L2 mismatch timeouts:
0, FIFO errors: 0,
Resource errors: 0
Output errors:
Carrier transitions: 0, Errors: 0, Drops: 0, Collisions: 0, Aged
packets: 0, FIFO errors: 0, HS link CRC errors: 0, MTU errors: 0, Resource
errors: 0
Egress queues: 12 supported, 5 in use
Queue counters: Queued packets Transmitted packets Dropped
packets
0 29604377 29604377
0
3 0 0
0
4 0 0
0
7 6835 6835
0
8 5865 5865
0
Queue number: Mapped forwarding classes
0 best-effort
3 fcoe
4 no-loss
7 network-control
8 mcast
Active alarms : None
Active defects : None
PCS statistics Seconds
Bit errors 0
Errored blocks 0
Ethernet FEC statistics Errors
FEC Corrected Errors 0
FEC Uncorrected Errors 0
FEC Corrected Errors Rate 0
FEC Uncorrected Errors Rate 0
MAC statistics: Receive Transmit
Total octets 40792860463 4232537714
Total packets 52096906 29620532
Unicast packets 52096695 29607881
Broadcast packets 0 1452
Multicast packets 211 11199
CRC/Align errors 0 0
FIFO errors 0 0
MAC control frames 0 0
MAC pause frames 0 0
Oversized frames 118467
Jabber frames 0
Fragment frames 0
VLAN tagged frames 0
Code violations 0
MAC Priority Flow Control Statistics:
Priority : 0 0 0
Priority : 1 0 0
Priority : 2 0 0
Priority : 3 0 0
Priority : 4 0 0
Priority : 5 0 0
Priority : 6 0 0
Priority : 7 0 0
PRBS Mode : Disabled
Autonegotiation information:
Negotiation status: Incomplete
Packet Forwarding Engine configuration:
Destination slot: 0 (0x00)
CoS information:
Direction : Output
CoS transmit queue Bandwidth Buffer
Priority Limit
% bps % usec
0 best-effort 5 50000000 5 0
low none
3 fcoe 35 350000000 35 0
low none
4 no-loss 35 350000000 35 0
low none
7 network-control 5 50000000 5 0
low none
8 mcast 20 200000000 20 0
low none
Interface transmit statistics: Disabled
MACSec statistics:
Output
Secure Channel Transmitted
Protected Packets : 0
Encrypted Packets : 0
Protected Bytes : 0
Encrypted Bytes : 0
Input
Secure Channel Received
Accepted Packets : 0
Validated Bytes : 0
Decrypted Bytes : 0

Logical interface ge-0/0/0.0 (Index 614) (SNMP ifIndex 553) (HW Token 51)
(Generation 201)
Flags: Up SNMP-Traps 0x24024000 Encapsulation: Ethernet-Bridge
Traffic statistics:
Input bytes : 20045
Output bytes : 105792
Input packets: 211
Output packets: 228
Local statistics:
Input bytes : 20045
Output bytes : 105792
Input packets: 211
Output packets: 228
Transit statistics:
Input bytes : 0 0 bps
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