Tuesday, January 12, 2021

Connection issues to devices on stacked Catalyst 9200L switches

Hi everyone,

A few days ago, i changed two WS-C2960-24TT-L switches with two stacked Catalyst 9200L switches.

Ever since i made this change, i noticed that every single device has a really slow connection, i'm losing ping to the devices, SSH is really slow, RDP is really slow etc.

I have 2 uplinks, GigabitEtherner1/1/1 is to our CORE switch, GigabitEthernet2/1/4 is to other ACCESS switch.

I tried troubleshooting the switch/ports, but can't come up with an idea what could be the issue.

Here is the output of the 2 uplink ports:

GigabitEthernet1/1/1 is up, line protocol is up (connected)

Hardware is Gigabit Ethernet, address is 3c13.cc5f.ec31 (bia 3c13.cc5f.ec31)

MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

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 on, output flow-control is unsupported

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:00, output 00:00:08, output hang never

Last clearing of "show interface" counters never

Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 74

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 3637000 bits/sec, 709 packets/sec

5 minute output rate 1056000 bits/sec, 404 packets/sec

95814614 packets input, 70190377800 bytes, 0 no buffer

Received 11880694 broadcasts (8867720 multicasts)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 8867720 multicast, 0 pause input

0 input packets with dribble condition detected

66824525 packets output, 12782824914 bytes, 0 underruns

Output 4969609 broadcasts (0 multicasts)

0 output errors, 0 collisions, 4 interface resets

0 unknown protocol drops

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

GigabitEthernet2/1/4 is up, line protocol is up (connected)

Hardware is Gigabit Ethernet, address is 802d.bfed.8434 (bia 802d.bfed.8434)

MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

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 on, output flow-control is unsupported

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:15, output 00:00:00, output hang never

Last clearing of "show interface" counters never

Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 7870

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 103000 bits/sec, 65 packets/sec

5 minute output rate 351000 bits/sec, 247 packets/sec

30022847 packets input, 17905254827 bytes, 0 no buffer

Received 7811898 broadcasts (3510541 multicasts)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 3510541 multicast, 0 pause input

0 input packets with dribble condition detected

36110786 packets output, 14828748859 bytes, 0 underruns

Output 3778534 broadcasts (0 multicasts)

0 output errors, 0 collisions, 2 interface resets

0 unknown protocol drops

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

I don't see any issues with the uplink ports, could there be an issue with the stacking configuration?

show switch

Switch/Stack Mac Address : 3c13.cc5f.ec00 - Local Mac Address

Mac persistency wait time: Indefinite H/W Current

Switch# Role Mac Address Priority Version State

*1 Active 3c13.cc5f.ec00 15 V01 Ready

2 Standby 802d.bfed.8400 14 V01 Ready

show switch stack-mode

Switch# Role Mac Address Version Mode Configured State

*1 Active 3c13.cc5f.ec00 V01 N+1 None Ready

2 Standby 802d.bfed.8400 V01 N+1 None Ready

Since this is my first time stacking Catalyst 9200L switch, is the Active/Standby Role correct? Is the Mode N+1 correct?

ANY questions or help about this issue would be really appreciated, i will gladly help!

Regards



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