Packet loss between 3560 and 2960 Switches

[JoelSalazar1502]

Hi everyone,

The following image shows part of our network. We got a problem as follows: Sometimes, we can ping Client 1, but we can't ping Client 2 from the 2960 Switch. But, at the same time, we can ping both clients, 1 and 2, from the 3560 Switch. Both clients are covered by the same AP and follow the same route to get to the 3560 Switch. This problem is happening just sometimes and with some of the clients, not all of them. All switches, APs, links and clients are in the same network (native VLAN = 1). I would appreciate any ideas you can bring about what could be happening. Thanks.

[Reza Sharifi]

Hi,

Can you post the output of "sh run" from the 2960?

HTH

[JoelSalazar1502]

Hi Reza,

Here there is. The Gi0/24 port is the port who links the 2960 Switch with the 3560 Switch.

2960

Current configuration : 9221 bytes
!
! Last configuration change at 07:44:48 UTC Sun Apr 12 2020
! NVRAM config last updated at 07:44:51 UTC Sun Apr 12 2020
!
version 12.2
no service pad
service timestamps debug datetime localtime show-timezone
service timestamps log datetime localtime show-timezone
service password-encryption
service sequence-numbers
service unsupported-transceiver
!
hostname C2960G_Mina_EBR-01
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$50E6$epaCqxTv4v0FoEHtTvWMG.
!
no aaa new-model
clock timezone UTC -5 0
system mtu routing 1500
vtp domain mina
vtp mode transparent
!
!
no ip domain-lookup
!
mls qos map cos-dscp 0 8 16 26 32 46 48 56
mls qos srr-queue input bandwidth 90 10
mls qos srr-queue input threshold 1 8 16
mls qos srr-queue input threshold 2 34 66
mls qos srr-queue input buffers 67 33
mls qos srr-queue input cos-map queue 1 threshold 2 1
mls qos srr-queue input cos-map queue 1 threshold 3 0
mls qos srr-queue input cos-map queue 2 threshold 1 2
mls qos srr-queue input cos-map queue 2 threshold 2 4 6 7
mls qos srr-queue input cos-map queue 2 threshold 3 3 5
mls qos srr-queue input dscp-map queue 1 threshold 2 9 10 11 12 13 14 15
mls qos srr-queue input dscp-map queue 1 threshold 3 0 1 2 3 4 5 6 7
mls qos srr-queue input dscp-map queue 1 threshold 3 32
mls qos srr-queue input dscp-map queue 2 threshold 1 16 17 18 19 20 21 22 23
mls qos srr-queue input dscp-map queue 2 threshold 2 33 34 35 36 37 38 39 48
mls qos srr-queue input dscp-map queue 2 threshold 2 49 50 51 52 53 54 55 56
mls qos srr-queue input dscp-map queue 2 threshold 2 57 58 59 60 61 62 63
mls qos srr-queue input dscp-map queue 2 threshold 3 24 25 26 27 28 29 30 31
mls qos srr-queue input dscp-map queue 2 threshold 3 40 41 42 43 44 45 46 47
mls qos srr-queue output cos-map queue 1 threshold 3 5
mls qos srr-queue output cos-map queue 2 threshold 3 3 6 7
mls qos srr-queue output cos-map queue 3 threshold 3 2 4
mls qos srr-queue output cos-map queue 4 threshold 2 1
mls qos srr-queue output cos-map queue 4 threshold 3 0
mls qos srr-queue output dscp-map queue 1 threshold 3 40 41 42 43 44 45 46 47
mls qos srr-queue output dscp-map queue 2 threshold 3 24 25 26 27 28 29 30 31
mls qos srr-queue output dscp-map queue 2 threshold 3 48 49 50 51 52 53 54 55
mls qos srr-queue output dscp-map queue 2 threshold 3 56 57 58 59 60 61 62 63
mls qos srr-queue output dscp-map queue 3 threshold 3 16 17 18 19 20 21 22 23
mls qos srr-queue output dscp-map queue 3 threshold 3 32 33 34 35 36 37 38 39
mls qos srr-queue output dscp-map queue 4 threshold 1 8
mls qos srr-queue output dscp-map queue 4 threshold 2 9 10 11 12 13 14 15
mls qos srr-queue output dscp-map queue 4 threshold 3 0 1 2 3 4 5 6 7
mls qos queue-set output 1 threshold 1 138 138 92 138
mls qos queue-set output 1 threshold 2 138 138 92 400
mls qos queue-set output 1 threshold 3 36 77 100 318
mls qos queue-set output 1 threshold 4 20 50 67 400
mls qos queue-set output 2 threshold 1 149 149 100 149
mls qos queue-set output 2 threshold 2 118 118 100 235
mls qos queue-set output 2 threshold 3 41 68 100 272
mls qos queue-set output 2 threshold 4 42 72 100 242
mls qos queue-set output 1 buffers 10 10 26 54
mls qos queue-set output 2 buffers 16 6 17 61
mls qos
!
crypto pki trustpoint TP-self-signed-4129007104
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-4129007104
revocation-check none
rsakeypair TP-self-signed-4129007104
!
!
crypto pki certificate chain TP-self-signed-4129007104
certificate self-signed 01
3082024A 308201B3 A0030201 02020101 300D0609 2A864886 F70D0101 04050030
31312F30 2D060355 04031326 494F532D 53656C66 2D536967 6E65642D 43657274
69666963 6174652D 34313239 30303731 3034301E 170D3933 30333031 30303031
30395A17 0D323030 31303130 30303030 305A3031 312F302D 06035504 03132649
4F532D53 656C662D 5369676E 65642D43 65727469 66696361 74652D34 31323930
30373130 3430819F 300D0609 2A864886 F70D0101 01050003 818D0030 81890281
8100B054 BA57E922 29DDBC95 BE47809D 371E0123 B9EEBAD9 543F81BA 5C086AE3
3BADB77F 62118D5A 614B04E5 CA9AB691 1B6F4399 E80695CE B9877734 5785B1EB
DC1EAD65 36F0399E 2D4515E8 06CDED2F 225B0A59 8CF8A55D EFBEDF2D 46092D9A
F17AC539 22115173 52F324A2 4F74FDF5 F7E4F4A6 39DB76C4 57C1C3C0 1F4C8B88
18270203 010001A3 72307030 0F060355 1D130101 FF040530 030101FF 301D0603
551D1104 16301482 12433239 3630475F 4D696E61 5F454252 2D303130 1F060355
1D230418 30168014 A1D71DC9 6E10F49B AB69048B D3DDA581 69FE2122 301D0603
551D0E04 160414A1 D71DC96E 10F49BAB 69048BD3 DDA58169 FE212230 0D06092A
864886F7 0D010104 05000381 81007D08 48EA4209 E3DB0B64 BF954C14 E42328AB
06E4EBA5 B71FB40E 0282A9F5 31AD0FA0 39A6BA44 0EAB8A9D 3FBA0562 BC6A9447
A1526AB4 C7D043EE 35BF2089 175181AD 61E8E9FD 02DF96A7 7F3DE3A8 B05E76BD
978319DE A4E782E9 B880D2BE BC75C216 B19CFD8E 1E66082B 27858C5A 6F9470E4
FFB2F3DB 90B05626 8CA25ACD 71CC
quit
lacp system-priority 1
!
!
!
errdisable recovery cause udld
errdisable recovery cause bpduguard
errdisable recovery cause security-violation
errdisable recovery cause channel-misconfig (STP)
errdisable recovery cause pagp-flap
errdisable recovery cause dtp-flap
errdisable recovery cause link-flap
errdisable recovery cause sfp-config-mismatch
errdisable recovery cause gbic-invalid
errdisable recovery cause psecure-violation
errdisable recovery cause port-mode-failure
errdisable recovery cause dhcp-rate-limit
errdisable recovery cause pppoe-ia-rate-limit
errdisable recovery cause mac-limit
errdisable recovery cause vmps
errdisable recovery cause storm-control
errdisable recovery cause inline-power
errdisable recovery cause arp-inspection
errdisable recovery cause loopback
errdisable recovery cause small-frame
errdisable recovery cause psp
!
spanning-tree mode rapid-pvst
spanning-tree portfast default
spanning-tree portfast bpduguard default
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
vlan 33
name LAN_Radio
!
vlan 190
lldp run
!
!
!
!
!
!
interface GigabitEthernet0/1
shutdown
!
interface GigabitEthernet0/2
shutdown
!
interface GigabitEthernet0/3
description AP Cisco
switchport mode trunk
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
queue-set 2
mls qos trust cos
macro description cisco-switch
auto qos voip trust
spanning-tree link-type point-to-point
!
interface GigabitEthernet0/4
shutdown
!
interface GigabitEthernet0/5
shutdown
!
interface GigabitEthernet0/6
shutdown
!
interface GigabitEthernet0/7
description B-Link Lixiviac
switchport mode trunk
srr-queue bandwidth share 10 10 60 20
queue-set 2
priority-queue out
mls qos trust cos
macro description cisco-switch
auto qos voip trust
spanning-tree link-type point-to-point
!
interface GigabitEthernet0/8
shutdown
!
interface GigabitEthernet0/9
description Link EBR-02
switchport mode trunk
srr-queue bandwidth share 10 10 60 20
queue-set 2
priority-queue out
mls qos trust cos
macro description cisco-switch
auto qos voip trust
spanning-tree link-type point-to-point
!
interface GigabitEthernet0/10
switchport mode trunk
shutdown
!
interface GigabitEthernet0/11
shutdown
!
interface GigabitEthernet0/12
shutdown
!
interface GigabitEthernet0/13
shutdown
!
interface GigabitEthernet0/14
shutdown
!
interface GigabitEthernet0/15
shutdown
!
interface GigabitEthernet0/16
shutdown
!
interface GigabitEthernet0/17
shutdown
!
interface GigabitEthernet0/18
shutdown
!
interface GigabitEthernet0/19
shutdown
!
interface GigabitEthernet0/20
shutdown
!
interface GigabitEthernet0/21
description UpLink EdifAdmin
switchport mode trunk
media-type sfp
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
queue-set 2
mls qos trust cos
macro description cisco-switch
auto qos voip trust
spanning-tree link-type point-to-point
!
interface GigabitEthernet0/22
description B-Link BBasura-03
switchport trunk allowed vlan 1,190
switchport mode trunk
media-type rj45
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
queue-set 2
mls qos trust cos
macro description cisco-switch
auto qos voip trust
spanning-tree link-type point-to-point
!
interface GigabitEthernet0/23
description Link Despacho Mina
switchport mode trunk
media-type sfp
duplex full
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
queue-set 2
mls qos trust cos
macro description cisco-switch
auto qos voip trust
spanning-tree link-type point-to-point
!
interface GigabitEthernet0/24
description Link EBR-03
switchport mode trunk
media-type rj45
srr-queue bandwidth share 10 10 60 20
queue-set 2
priority-queue out
mls qos trust cos
macro description cisco-switch
auto qos voip trust
spanning-tree link-type point-to-point
!
interface Vlan1
ip address 192.168.160.4 255.255.255.0
no ip route-cache
!
ip default-gateway 192.168.160.51
ip http server
ip http secure-server
logging esm config
snmp-server community public RO
snmp-server location Edif. Administ.
snmp-server contact TI Cuajone
snmp-server chassis-id C2960_Adm_Edif
!
line con 0
line vty 0 4
password 7 044B2531232842455B4A
login
length 0
line vty 5 15
password 7 044B2531232842455B4A
login
!
ntp server 172.19.32.193
end

[Reza Sharifi]

Hi,

The config looks good. For testing, can you simply configure the port on the 2960 and the 3560 as follows:

Also, is the 3560 the gateway for vlan 1?

interface GigabitEthernet0/24
description Link EBR-03
switchport mode trunk
media-type rj45

And test again

HTH

[JoelSalazar1502]

Hi,

I'll do as you say, then I'll check if the problem remains. About the gateway, the 3560 switch isn't the gateway, the Gateway is a router, which is placed in another part of our network.