11-01-2011 11:09 AM - edited 03-07-2019 03:09 AM
we have several uplink ports on a verity of cisco switches connecting to the nexus 7000, recording CRC errors.
most are trunked ports with the following configuration.
access switch:
interface GigabitEthernet0/25
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
end
nexus port:
interface Ethernet1/19
switchport
switchport mode trunk
no shutdown.
nexus is running:
version 5.2(1)
switch is running:
ws-c3560G-24TS 12.2(35)SE5
do not see any performance issues, just crc errors. Any ideas?
11-03-2011 10:36 PM
What type of module is in the N7K? Can you tell us if the problem is on 1 module or across multiple? Do the errors also show up as input errors?
Thanks,
Dale
11-04-2011 06:16 AM
modules:
48 port 1000 Mbps Optical Ethernet Module N&K-M148GS-11
it is happening over two modules we have.
Nexus 7K Mod Ports Module-Type Model Status --- ----- ----------------------------------- ------------------ ----------
1 48 1000 Mbps Optical Ethernet Module N7K-M148GS-11 ok
2 8 10 Gbps Ethernet XL Module N7K-M108X2-12L ok
3 48 10/100/1000 Mbps Ethernet Module N7K-M148GT-11 ok
5 0 Supervisor module-1X N7K-SUP1 active *
6 0 Supervisor module-1X N7K-SUP1 ha-standby
8 48 10/100/1000 Mbps Ethernet Module N7K-M148GT-11 ok
9 8 10 Gbps Ethernet XL Module N7K-M108X2-12L ok
10 48 1000 Mbps Optical Ethernet Module N7K-M148GS-11 ok
example of access switch uplink port:
GigabitEthernet0/25 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 3cdf.1ec7.f999 (bia 3cdf.1ec7.f999) MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 20/255 Encapsulation ARPA, loopback not set Keepalive not set Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 2d19h Input queue: 0/75/0/0 (size/max/drops/flushes);
Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max)
5 minute input rate 79949000 bits/sec, 7092 packets/sec
5 minute output rate 1975000 bits/sec, 3432 packets/sec
1638438298 packets input, 2268962487134 bytes, 0 no buffer
Received 98383573 broadcasts (0 multicasts) 0 runts, 0 giants, 0 throttles
96602 input errors, 96602 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 62304948 multicast, 0 pause input 0 input packets with dribble condition detected
742062096 packets output, 96087437772 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
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