09-03-2014 05:02 AM - edited 03-07-2019 08:37 PM
Hi,
Server is connected to two nexus 7k using VPC.I am seeing input discard error on the interface
Can any body advise why input discard error is increasing
Nexus 1
NEXUS7K-1# sh int e 14/20
Ethernet14/20 is up
admin state is up, Dedicated Interface
Belongs to Po1820
Hardware: 1000/10000 Ethernet, address: b838.61b8.7c63 (bia b838.61b8.7c63)
Description: ****** MAM-IMEX-03 VLAN_12 ****
MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec
reliability 255/255, txload 1/255, rxload 4/255
Encapsulation ARPA, medium is broadcast
Port mode is access
full-duplex, 10 Gb/s, media type is 10G
Beacon is turned off
Auto-Negotiation is turned on
Input flow-control is off, output flow-control is off
Auto-mdix is turned off
Rate mode is dedicated
Switchport monitor is off
EtherType is 0x8100
EEE (efficient-ethernet) : n/a
Last link flapped 3d09h
Last clearing of "show interface" counters 1w5d
5 interface resets
30 seconds input rate 162892448 bits/sec, 13494 packets/sec
30 seconds output rate 75368 bits/sec, 40 packets/sec
Load-Interval #2: 5 minute (300 seconds)
input rate 22.72 Mbps, 1.87 Kpps; output rate 87.75 Kbps, 27 pps
RX
4722536902 unicast packets 126282 multicast packets 1040 broadcast packets
4722660780 input packets 6937040338942 bytes
0 jumbo packets 0 storm suppression packets
20 runts 0 giants 4 CRC 0 no buffer
24 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 306997 input discard
0 Rx pause
TX
885319693 unicast packets 18325611 multicast packets 4639140 broadcast packets
908280976 output packets 388758590992 bytes
0 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
******************************************************8
Nexus 2
Nexus7K-2# sh int e12[J[J14/20
Ethernet14/20 is up
admin state is up, Dedicated Interface
Belongs to Po1820
Hardware: 1000/10000 Ethernet, address: c08c.60af.f3ff (bia c08c.60af.f3ff)
Description: ****** MAM-IMEX-03 VLAN_12 ****
MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, medium is broadcast
Port mode is access
full-duplex, 10 Gb/s, media type is 10G
Beacon is turned off
Auto-Negotiation is turned on
Input flow-control is off, output flow-control is off
Auto-mdix is turned off
Rate mode is dedicated
Switchport monitor is off
EtherType is 0x8100
EEE (efficient-ethernet) : n/a
Last link flapped 3d09h
Last clearing of "show interface" counters 1w5d
4 interface resets
30 seconds input rate 26360 bits/sec, 13 packets/sec
30 seconds output rate 65592 bits/sec, 33 packets/sec
Load-Interval #2: 5 minute (300 seconds)
input rate 27.22 Kbps, 2 pps; output rate 67.90 Kbps, 25 pps
RX
3289525772 unicast packets 138738 multicast packets 19343 broadcast packets
3289712832 input packets 4858618378664 bytes
0 jumbo packets 0 storm suppression packets
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 60988 input discard
0 Rx pause
TX
1721271093 unicast packets 22194874 multicast packets 2877112 broadcast packets
1746339610 output packets 2252252433048 bytes
0 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
******************************
NEXUS7K-1# sh ver
Cisco Nexus Operating System (NX-OS) Software
TAC support: http://www.cisco.com/tac
Documents: http://www.cisco.com/en/US/products/ps9372/tsd_products_support_series_home.html
Copyright (c) 2002-2012, Cisco Systems, Inc. All rights reserved.
The copyrights to certain works contained in this software are
owned by other third parties and used and distributed under
license. Certain components of this software are licensed under
the GNU General Public License (GPL) version 2.0 or the GNU
Lesser General Public License (LGPL) Version 2.1. A copy of each
such license is available at
http://www.opensource.org/licenses/gpl-2.0.php and
http://www.opensource.org/licenses/lgpl-2.1.php
Software
BIOS: version 2.8.0
kickstart: version 6.1(1)
system: version 6.1(1)
BIOS compile time: 06/09/12
kickstart image file is: bootflash:///n7000-s2-kickstart.6.1.1.bin
kickstart compile time: 6/26/2012 0:00:00 [08/10/2012 04:18:43]
system image file is: bootflash:///n7000-s2-dk9.6.1.1.bin
system compile time: 6/26/2012 0:00:00 [08/10/2012 05:17:45]
Hardware
cisco Nexus7000 C7018 (18 Slot) Chassis ("Supervisor module-2")
Intel(R) Xeon(R) CPU with 12225164 kB of memory.
Processor Board ID JAF1631ARQB
Device name: NEXUS7K-1
bootflash: 1966080 kB
slot0: 0 kB (expansion flash)
Kernel uptime is 488 day(s), 0 hour(s), 50 minute(s), 25 second(s)
Last reset
Reason: Unknown
System version: 6.1(1)
Service:
plugin
Core Plugin, Ethernet Plugin
09-03-2014 05:40 AM
Hi,
Could you please go through the below link and check if this helps.
https://supportforums.cisco.com/discussion/10982271/nexus-7k-3750g-vpc-high-input-discards-rx-side
If no then capture the outputs suggested in the link and share the same.
There is a known issue that allowed vlan miss match causes "input discards" on nexus side.
Incoming traffic that has dot1q tag which is not allowed at nexus side is accounted in "input discard".
HTH
Regards
Inayath
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