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 _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp