Re: Jumbo packets on interface in Nexus 9000

JustoSocarras27727 · ‎01-13-2021

Hello,

I am configuring a brand new Nexus 9000, and I'm worry because I see too many Jumbo Packets on a trunk interface (the only interface I've configured so far). I limited the MTU size to 1500 on this Nexus and on the other peer, but the interface still receiving jumbo packets.

How can I resolve this problem?.

admin state is up, Dedicated Interface
Hardware: 100/1000/10000 Ethernet,
Description:
MTU 1500 bytes, BW 1000000 Kbit , DLY 10 usec
reliability 255/255, txload 1/255, rxload 13/255
Encapsulation ARPA, medium is broadcast
Port mode is trunk
full-duplex, 1000 Mb/s
Beacon is turned off
Auto-Negotiation is turned on FEC mode is Auto
Input flow-control is off, output flow-control is off
Auto-mdix is turned on
Switchport monitor is off
EtherType is 0x8100
EEE (efficient-ethernet) : n/a
admin fec state is auto, oper fec state is off
Last link flapped 01:29:36
Last clearing of "show interface" counters 00:31:03
0 interface resets
Load-Interval #1: 30 seconds
30 seconds input rate 51544176 bits/sec, 4600 packets/sec
30 seconds output rate 216 bits/sec, 0 packets/sec
input rate 51.54 Mbps, 4.60 Kpps; output rate 216 bps, 0 pps
Load-Interval #2: 5 minute (300 seconds)
300 seconds input rate 51249848 bits/sec, 4514 packets/sec
300 seconds output rate 176 bits/sec, 0 packets/sec
input rate 51.25 Mbps, 4.51 Kpps; output rate 176 bps, 0 pps
RX
8335721 unicast packets 95071 multicast packets 17537 broadcast packets
8448329 input packets 11785781308 bytes
6496608 jumbo packets 0 storm suppression bytes
0 runts 0 giants 0 CRC 0 no buffer
0 input error 0 short frame 0 overrun 0 underrun 0 ignored
0 watchdog 0 bad etype drop 0 bad proto drop 0 if down drop
0 input with dribble 0 input discard
0 Rx pause
TX
196 unicast packets 433 multicast packets 1 broadcast packets
630 output packets 273808 bytes
143 jumbo packets
0 output error 0 collision 0 deferred 0 late collision
0 lost carrier 0 no carrier 0 babble 0 output discard
0 Tx pause

Thank you,

f00z · ‎01-13-2021

show system internal ethpm info interface ethX/X | grep -i mtu

show int ethX/X counters detailed all

JustoSocarras27727 · ‎01-13-2021

Hello f00z,

show system internal ethpm info interface ethX/X | grep -i mtu

# sh system internal ethpm info interface Ethx/x | grep -i mtu
medium(broadcast), snmp trap(on), MTU(1500),
admin_state(1), admin_layer(1), admin_router_mac(0) admin_mtu(1)
ethpm_ im_get_ifindex_mtu_list 1500
ethpm_ im_get_ifindex_mtu_usr_conf_flag_list 1
ethpm_ im_get_ifindex_vl_mtu_list No function pointer
ethpm_ im_get_ifindex_system_def_class_mtu_list No function pointer

show int ethX/X counters detailed all

# sh interface Ethx/x counters detailed all
64 bit counters:
0. rxHCTotalPkts = 14826582
1. txHCTotalPks = 1023
2. rxHCUnicastPkts = 14627510
3. rxHCMulticastPkts = 168220
4. rxHCBroadcastPkts = 30852
5. rxHCOctets = 20679405467
6. txHCUnicastPkts = 216
7. txHCMulticastPkts = 800
8. txHCBroadcastPkts = 7
9. txHCOctets = 316683
10. rxTxHCPkts64Octets = 12035
11. rxTxHCpkts65to127Octets = 586708
12. rxTxHCpkts128to255Octets = 114857
13. rxTxHCpkts256to511Octets = 134710
14. rxTxHCpkts512to1023Octets = 335152
15. rxTxHCpkts1024to1518Octets = 2229393
16. rxTxHCpkts1519to1548Octets = 11414750
17. rxHCTrunkFrames = 0
18. txHCTrunkFrames = 0
19. rxHCDropEvents = 0
19. InLayer3Unicast = 0
20. InLayer3UnicastOctets = 0
21. InLayer3Multicast = 0
22. InLayer3MulticastOctets = 0
23. OutLayer3Unicast = 0
24. OutLayer3UnicastOctets = 0
25. OutLayer3Multicast = 0
26. OutLayer3MulticastOctets = 0
27. InLayer3Routed = 0
28. InLayer3RoutedOctets = 0
29. OutLayer3Routed = 0
30. OutLayer3RoutedOctets = 0
31. InLayer3AverageOctets = 0
32. InLayer3AveragePackets = 0
33. OutLayer3AverageOctets = 0
34. OutLayer3AveragePackets = 0

All Port Counters:
0. Rx Packets: = 14826582
1. Rx Bytes: = 20679405467
2. No Buffer Errors: = 0
3. Rx Broadcast Packets: = 30852
4. Rx Multicast Packets: = 168220
5. Rx Unicast Packets: = 14627510
6. Rx Jumbo Packets: = 11414607
7. Runt Errors: = 0
8. Rx Storm Suppression: = 0
9. Input Errors: = 0
10. Input CRC Errors: = 0
11. ECC Errors: = 0
12. Overrun Errors: = 0
13. Ignored Errors: = 0
14. Watchdog Errors: = 0
15. tx broadcast packets: = 7
16. tx multicast packets: = 800
17. tx unicast packets: = 216
18. tx jumbo packets: = 143
19. Rx Pause: = 0
20. Dribble Errors: = 0
21. If Down Drop Errors: = 0
22. Bad Etype Drop Errors: = 0
23. Bad Proto Drop Errors: = 0
24. tx packets: = 1023
25. tx bytes: = 316683
26. Underrun Errors: = 0
27. Output Errors: = 0
28. Collision Errors: = 0
29. Resets: = 0
30. Babble Errors: = 0
31. Late Collision Errors: = 0
32. Deferred Errors: = 0
33. Lost Carrier Errors: = 0
34. No Carrier Errors: = 0
35. Tx Pause: = 0
36. Single Collision Errors: = 0
37. Multi-Collision Errors: = 0
38. Excess Collision Errors: = 0
39. Jabber Errors: = 0
40. Short Frame Errors: = 0
41. Input Discard Errors: = 0
42. Bad Encapsulation Errors: = 0
43. Output CRC Errors: = 0
44. Symbol Errors: = 0
45. Output Dropped Errors: = 0
46. SQETest = 0
47. Rx Packets from 0 to 64 bytes: = 12032
48. Rx Packets from 65 to 127 bytes: = 585923
49. Rx Packets from 128 to 255 bytes: = 114857
50. Rx Packets from 256 to 511 bytes: = 134644
51. Rx Packets from 512 to 1023 bytes: = 335126
52. Rx Packets from 1024 to 1518 bytes: = 2229393
53. Rx Packets from 1519 to 1548 bytes: = 11414607
54. Rx Trunk Packets: = 0
55. Tx Packets from 0 to 64 bytes: = 3
56. Tx Packets from 65 to 127 bytes: = 785
57. Tx Packets from 128 to 255 bytes: = 0
58. Tx Packets from 256 to 511 bytes: = 66
59. Tx Packets from 512 to 1023 bytes: = 26
60. Tx Packets from 1024 to 1518 bytes: = 0
61. Tx Packets from 1519 to 1548 bytes: = 143
62. Tx Trunk Packets: = 0
63. Output BPDU Lost: = 0
64. Output COS0 Lost: = 0
65. Output COS1 Lost: = 0
66. Output COS2 Lost: = 0
67. Output COS3 Lost: = 0
68. Output COS4 Lost: = 0
69. Output COS5 Lost: = 0
70. Output COS6 Lost: = 0
71. Output COS7 Lost: = 0