Re: Cisco SG300 series poor performance when connected to Catalyst 365 - Page 2

CyberNBD · ‎12-19-2023

Hello,

I have a network consisting of several Catalyst WS-C3650-48-FQ-L switches to which we sometimes want to add small drop-switches for a few devices. Since we have some spare SG300-10MPP switches I thought to use these but somehow these SG300 switches seem to cause massive performance issues for the devices connected to them.

On their own the SG300 switches work fine. Connecting all devices to the 3650's also poses no issues. I did all troubleshooting I could think of including creating a small stand-alone network with some spare switches in default config, but I get the exact same behaviour. There are no interface errors. From default config tried disabling EEE, POE etc. on the inter-switch ports. Set them to default 1G, checked STP etc. but the problems persists.

Only thing I am noticing is unknown protocol dropped packets on the 3650 port to which the SG is connected. Could this be a cause of the issues, and where should I look further to resolve this? Anything else I am missing what could cause the incompatibility between both series of switches?

CyberNBD · ‎12-27-2023

We don't use multicast in this particular case / test but it is enabled on the SG300.

SG300 Config:

config-file-header
SW-SG300
v1.4.2.4 / R800_NIK_1_4_194_194
CLI v1.0
set system mode router

file SSD indicator encrypted
@
ssd-control-start
ssd config
ssd file passphrase control unrestricted
no ssd file integrity control
ssd-control-end cb0a3fdb1f3a1af4e4430033719968c0
!
spanning-tree mode mst
spanning-tree priority 61440
bridge multicast filtering
vlan database
vlan 4-5,11-12,21-22,31,41,91-92
exit
voice vlan oui-table add 0001e3 Siemens_AG_phone________
voice vlan oui-table add 00036b Cisco_phone_____________
voice vlan oui-table add 00096e Avaya___________________
voice vlan oui-table add 000fe2 H3C_Aolynk______________
voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone
voice vlan oui-table add 00d01e Pingtel_phone___________
voice vlan oui-table add 00e075 Polycom/Veritel_phone___
voice vlan oui-table add 00e0bb 3Com_phone______________
errdisable recovery interval 30
errdisable recovery cause stp-bpdu-guard
no eee enable
no qos
qos advanced ports-trusted
qos advanced-mode trust dscp
qos map dscp-queue 8 to 2
qos map dscp-queue 16 to 1
qos map dscp-queue 17 to 1
qos map dscp-queue 18 to 1
qos map dscp-queue 19 to 1
qos map dscp-queue 20 to 1
qos map dscp-queue 21 to 1
qos map dscp-queue 22 to 1
qos map dscp-queue 23 to 1
qos map dscp-queue 24 to 1
qos map dscp-queue 25 to 1
qos map dscp-queue 26 to 1
qos map dscp-queue 27 to 1
qos map dscp-queue 28 to 1
qos map dscp-queue 29 to 1
qos map dscp-queue 30 to 1
qos map dscp-queue 31 to 1
qos map dscp-queue 32 to 1
qos map dscp-queue 33 to 1
qos map dscp-queue 34 to 1
qos map dscp-queue 35 to 1
qos map dscp-queue 36 to 1
qos map dscp-queue 37 to 1
qos map dscp-queue 38 to 1
qos map dscp-queue 39 to 1
qos map dscp-queue 40 to 1
qos map dscp-queue 41 to 1
qos map dscp-queue 42 to 1
qos map dscp-queue 43 to 1
qos map dscp-queue 44 to 1
qos map dscp-queue 45 to 1
qos map dscp-queue 46 to 3
qos map dscp-queue 47 to 1
qos map dscp-queue 48 to 1
qos map dscp-queue 49 to 1
qos map dscp-queue 50 to 1
qos map dscp-queue 51 to 1
qos map dscp-queue 52 to 1
qos map dscp-queue 53 to 1
qos map dscp-queue 54 to 1
qos map dscp-queue 55 to 1
qos map dscp-queue 56 to 4
qos map dscp-queue 57 to 1
qos map dscp-queue 58 to 1
qos map dscp-queue 59 to 1
qos map dscp-queue 60 to 1
qos map dscp-queue 61 to 1
qos map dscp-queue 62 to 1
qos map dscp-queue 63 to 1
hostname SW-SG300
no passwords complexity enable
username admin password **** privilege 15
ip ssh server
!
interface vlan 1
 no ip address dhcp
 shutdown
!
interface vlan 4
!
interface vlan 5
!
interface vlan 11
 bridge multicast mode ipv4-group
 bridge multicast ipv6 mode ip-group
!
interface vlan 12
 bridge multicast mode ipv4-group
 bridge multicast ipv6 mode ip-group
!
interface vlan 21
!
interface vlan 22
!
interface vlan 31
 ip address 198.18.1.233 255.255.255.0
!
interface vlan 41
!
interface vlan 91
!
interface vlan 92
!
interface gigabitethernet1
 no eee enable
 flowcontrol on
 switchport mode access
 switchport access vlan 31
 no eee lldp enable
 no green-ethernet energy-detect
!
interface gigabitethernet2
 no eee enable
 flowcontrol on
 switchport mode access
 switchport access vlan 31
 no eee lldp enable
 no green-ethernet energy-detect
!
interface gigabitethernet3
 no eee enable
 flowcontrol on
 switchport mode access
 switchport access vlan 31
 no eee lldp enable
 no green-ethernet energy-detect
!
interface gigabitethernet4
 no eee enable
 flowcontrol on
 switchport mode access
 switchport access vlan 31
 no eee lldp enable
 no green-ethernet energy-detect
!
interface gigabitethernet5
 no eee enable
 flowcontrol on
 switchport mode access
 switchport access vlan 31
 no eee lldp enable
 no green-ethernet energy-detect
!
interface gigabitethernet6
 no eee enable
 flowcontrol on
 switchport mode access
 switchport access vlan 31
 no eee lldp enable
 no green-ethernet energy-detect
!
interface gigabitethernet7
 no eee enable
 flowcontrol on
 switchport mode access
 switchport access vlan 31
 no eee lldp enable
 no green-ethernet energy-detect
!
interface gigabitethernet8
 no eee enable
 flowcontrol on
 switchport mode access
 switchport access vlan 31
 no eee lldp enable
 no green-ethernet energy-detect
!
interface gigabitethernet9
 no eee enable
 flowcontrol on
 description Po1-A
 channel-group 1 mode auto
 no eee lldp enable
 no green-ethernet energy-detect
!
interface gigabitethernet10
 no eee enable
 flowcontrol on
 description Po1-B
 channel-group 1 mode auto
 no eee lldp enable
 no green-ethernet energy-detect
!
interface Port-channel1
 flowcontrol on
 description "Po1"
 switchport trunk allowed vlan add 4-5,11-12,21-22,31,41,91-92
!
macro auto disabled
ip igmp snooping
ip igmp snooping vlan 11
ip igmp snooping vlan 12
ip igmp snooping vlan 11 querier version 3
ip igmp snooping vlan 11 querier
ip igmp snooping vlan 12 querier version 3
ip igmp snooping vlan 12 querier

WS-C3650 Config:

version 16.12
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
platform punt-keepalive disable-kernel-core
!
hostname SW-3650
!
!
vrf definition Mgmt-vrf
 !
 address-family ipv4
 exit-address-family
 !
 address-family ipv6
 exit-address-family
!
!
aaa new-model
!
!
aaa authentication login default local
aaa authentication ppp default local
aaa authorization network default local
!
!
!
!
!
!
aaa session-id common
switch 1 provision ws-c3650-48pq
!
!
!
!
call-home
 ! If contact email address in call-home is configured as sch-smart-licensing@cisco.com
 ! the email address configured in Cisco Smart License Portal will be used as contact email address to send SCH notifications.
 contact-email-addr sch-smart-licensing@cisco.com
 profile "CiscoTAC-1"
  active
  destination transport-method http
  no destination transport-method email
!
!
!
!
!
no ip domain lookup
ip domain name office.local
!
!
!
login on-success log
!
!
!
!
!
!
!
vtp domain jbg
vtp mode off
no device-tracking logging theft
!
crypto pki trustpoint SLA-TrustPoint
 enrollment pkcs12
 revocation-check crl
!
crypto pki trustpoint TP-self-signed-3101682150
 enrollment selfsigned
 subject-name cn=IOS-Self-Signed-Certificate-3101682150
 revocation-check none
 rsakeypair TP-self-signed-3101682150
!
!
crypto pki certificate chain SLA-TrustPoint
 certificate ca 01
  30820321 30820209 A0030201 02020101 300D0609 2A864886 F70D0101 0B050030
  32310E30 0C060355 040A1305 43697363 6F312030 1E060355 04031317 43697363
  6F204C69 63656E73 696E6720 526F6F74 20434130 1E170D31 33303533 30313934
  3834375A 170D3338 30353330 31393438 34375A30 32310E30 0C060355 040A1305
  43697363 6F312030 1E060355 04031317 43697363 6F204C69 63656E73 696E6720
  526F6F74 20434130 82012230 0D06092A 864886F7 0D010101 05000382 010F0030
  82010A02 82010100 A6BCBD96 131E05F7 145EA72C 2CD686E6 17222EA1 F1EFF64D
  CBB4C798 212AA147 C655D8D7 9471380D 8711441E 1AAF071A 9CAE6388 8A38E520
  1C394D78 462EF239 C659F715 B98C0A59 5BBB5CBD 0CFEBEA3 700A8BF7 D8F256EE
  4AA4E80D DB6FD1C9 60B1FD18 FFC69C96 6FA68957 A2617DE7 104FDC5F EA2956AC
  7390A3EB 2B5436AD C847A2C5 DAB553EB 69A9A535 58E9F3E3 C0BD23CF 58BD7188
  68E69491 20F320E7 948E71D7 AE3BCC84 F10684C7 4BC8E00F 539BA42B 42C68BB7
  C7479096 B4CB2D62 EA2F505D C7B062A4 6811D95B E8250FC4 5D5D5FB8 8F27D191
  C55F0D76 61F9A4CD 3D992327 A8BB03BD 4E6D7069 7CBADF8B DF5F4368 95135E44
  DFC7C6CF 04DD7FD1 02030100 01A34230 40300E06 03551D0F 0101FF04 04030201
  06300F06 03551D13 0101FF04 05300301 01FF301D 0603551D 0E041604 1449DC85
  4B3D31E5 1B3E6A17 606AF333 3D3B4C73 E8300D06 092A8648 86F70D01 010B0500
  03820101 00507F24 D3932A66 86025D9F E838AE5C 6D4DF6B0 49631C78 240DA905
  604EDCDE FF4FED2B 77FC460E CD636FDB DD44681E 3A5673AB 9093D3B1 6C9E3D8B
  D98987BF E40CBD9E 1AECA0C2 2189BB5C 8FA85686 CD98B646 5575B146 8DFC66A8
  467A3DF4 4D565700 6ADF0F0D CF835015 3C04FF7C 21E878AC 11BA9CD2 55A9232C
  7CA7B7E6 C1AF74F6 152E99B7 B1FCF9BB E973DE7F 5BDDEB86 C71E3B49 1765308B
  5FB0DA06 B92AFE7F 494E8A9E 07B85737 F3A58BE1 1A48A229 C37C1E69 39F08678
  80DDCD16 D6BACECA EEBC7CF9 8428787B 35202CDC 60E4616A B623CDBD 230E3AFB
  418616A9 4093E049 4D10AB75 27E86F73 932E35B5 8862FDAE 0275156F 719BB2F0
  D697DF7F 28
        quit
crypto pki certificate chain TP-self-signed-3101682150
 certificate self-signed 01
  30820330 30820218 A0030201 02020101 300D0609 2A864886 F70D0101 05050030
  31312F30 2D060355 04031326 494F532D 53656C66 2D536967 6E65642D 43657274
  69666963 6174652D 33313031 36383231 3530301E 170D3233 31323036 31343432
  33355A17 0D333030 31303130 30303030 305A3031 312F302D 06035504 03132649
  4F532D53 656C662D 5369676E 65642D43 65727469 66696361 74652D33 31303136
  38323135 30308201 22300D06 092A8648 86F70D01 01010500 0382010F 00308201
  0A028201 0100C1A4 8281E757 F79183F7 3208ABD2 DEA4E82C D479FAFB 6D7FCD71
  19EF630F 3BA51339 DA42DE61 083BDF86 59589745 A47F85C1 E9EA84C3 A7860C69
  E62DE3BD 8216A76A 93989D44 92BE23C4 E5717543 2D6E0474 53E61DED 7FFC0844
  92163557 82A1777D 331C9F09 E1C99FA5 292A3DCC 787B2957 822727BA 8B1C361A
  1EB29DB3 52723F9D 703F3839 10E11B89 99C7F1D9 88079454 7F6AE817 7044DFDE
  A2B55947 7DB51097 B82E13E7 878D5B1E BD8E26E7 0C13DB22 15FDD0B5 0D09DB73
  2DEB3DFE 299D7151 67F7429A 2CF0A2F0 F0A84217 8D8E0DF1 C9A4F56B E8C9E2A0
  F8B6D0CC B9F62C46 2EC89E58 95EF0969 2C026675 5A71BB9D 263D9E09 06064E37
  505DC00B 24890203 010001A3 53305130 0F060355 1D130101 FF040530 030101FF
  301F0603 551D2304 18301680 14C4454F 7334FD96 0D8CDACC 6A25F1B6 60E091A8
  3F301D06 03551D0E 04160414 C4454F73 34FD960D 8CDACC6A 25F1B660 E091A83F
  300D0609 2A864886 F70D0101 05050003 82010100 506CEA01 9035AF12 2BBA8ABB
  557CD94E 706C51DC 9D2EA53F 69509D8D 05C613E5 D23DC42F 3F20FF95 2604CAE6
  2E92DFDB CEDE7157 AF343738 E720C642 E88C054A CE28AA76 3F3F1D89 6E08AD03
  8796E529 F3EABE74 873E2913 EE78F047 1260E93E 1A4F14EB 330A9C43 DEADCC10
  4E2A6C83 659043EB E8B64F23 4BC64AA2 AAA0CFED 74E8C6A7 4393DEF3 F080B861
  4DF557EB 4645C2C0 91277990 FDA7B0D2 8D6B8910 BE127E8C B250184E 02EE6B1E
  1F06FBBE EC4FDBB8 B9CA2CCB B0F1CCE7 376A17D2 5758D810 1463AC82 1453DF05
  F7201028 E20EF511 BC30B928 F06683A6 E7628BE2 0E76EBE0 7D4364F4 E8A1B289
  09CAB8A2 CA07A725 37E909E7 714DD503 2D5B44E8
        quit
!
!
license boot level ipservicesk9
!
!
diagnostic bootup level minimal
!
spanning-tree mode mst
spanning-tree extend system-id
memory free low-watermark processor 79468
!
username admin privilege 15 secret 9 ****

!
redundancy
 mode sso
!
!
!
!
!
transceiver type all
 monitoring
!
vlan 4-5,11-12
!
vlan 21
!
vlan 22
!
vlan 31
!
vlan 41
!
vlan 91-92
lldp run
!
!
class-map match-any system-cpp-police-topology-control
  description Topology control
class-map match-any system-cpp-police-sw-forward
  description Sw forwarding, L2 LVX data, LOGGING
class-map match-any system-cpp-default
  description EWLC control, EWLC data, Inter FED
class-map match-any system-cpp-police-sys-data
  description Learning cache ovfl, High Rate App, Exception, EGR Exception, NFL SAMPLED DATA, RPF Failed
class-map match-any system-cpp-police-punt-webauth
  description Punt Webauth
class-map match-any system-cpp-police-l2lvx-control
  description L2 LVX control packets
class-map match-any system-cpp-police-forus
  description Forus Address resolution and Forus traffic
class-map match-any system-cpp-police-multicast-end-station
  description MCAST END STATION
class-map match-any system-cpp-police-multicast
  description Transit Traffic and MCAST Data
class-map match-any system-cpp-police-l2-control
  description L2 control
class-map match-any system-cpp-police-dot1x-auth
  description DOT1X Auth
class-map match-any system-cpp-police-data
  description ICMP redirect, ICMP_GEN and BROADCAST
class-map match-any system-cpp-police-stackwise-virt-control
  description Stackwise Virtual
class-map match-any non-client-nrt-class
class-map match-any system-cpp-police-routing-control
  description Routing control and Low Latency
class-map match-any system-cpp-police-protocol-snooping
  description Protocol snooping
class-map match-any system-cpp-police-dhcp-snooping
  description DHCP snooping
class-map match-any system-cpp-police-system-critical
  description System Critical and Gold Pkt
!
policy-map system-cpp-policy
!
!
!
!
!
!
!
!
!
!
!
interface Port-channel1
 description "Po1"
 switchport trunk allowed vlan 4,5,11,12,21,22,31,41,91,92
 switchport mode trunk
!
interface Port-channel2
 description "Po2"
 switchport trunk allowed vlan 4,5,11,12,21,22,31,41,91,92
 switchport mode trunk
!
interface Port-channel10
 description "Po10"
 switchport trunk allowed vlan 4,5,11,12,21,22,31,41,91,92
 switchport mode trunk
!
interface GigabitEthernet0/0
 description "MGMT"
 vrf forwarding Mgmt-vrf
 ip address dhcp
 negotiation auto
!
interface GigabitEthernet1/0/1
 switchport access vlan 11
 switchport mode access
 spanning-tree portfast
!
interface GigabitEthernet1/0/2
 switchport access vlan 11
 switchport mode access
 spanning-tree portfast
!
interface GigabitEthernet1/0/3
 switchport access vlan 11
 switchport mode access
 spanning-tree portfast
!
interface GigabitEthernet1/0/4
 switchport access vlan 11
 switchport mode access
 spanning-tree portfast
!
interface GigabitEthernet1/0/5
 switchport access vlan 41
 spanning-tree portfast
!
interface GigabitEthernet1/0/6
 switchport access vlan 41
 spanning-tree portfast
!
interface GigabitEthernet1/0/7
 switchport access vlan 41
 spanning-tree portfast
!
interface GigabitEthernet1/0/8
 switchport access vlan 41
 spanning-tree portfast
!
interface GigabitEthernet1/0/9
 switchport access vlan 11
 spanning-tree portfast
!
interface GigabitEthernet1/0/10
 switchport access vlan 11
 spanning-tree portfast
!
interface GigabitEthernet1/0/11
 switchport access vlan 41
 spanning-tree portfast
!
interface GigabitEthernet1/0/12
 switchport access vlan 41
 spanning-tree portfast
!
interface GigabitEthernet1/0/13
 switchport access vlan 31
 spanning-tree portfast
!
interface GigabitEthernet1/0/14
 switchport access vlan 31
 spanning-tree portfast
!
interface GigabitEthernet1/0/15
 switchport access vlan 31
 spanning-tree portfast
!
interface GigabitEthernet1/0/16
 switchport access vlan 31
 spanning-tree portfast
!
interface GigabitEthernet1/0/17
 switchport access vlan 31
 spanning-tree portfast
!
interface GigabitEthernet1/0/18
 switchport access vlan 31
 spanning-tree portfast
!
interface GigabitEthernet1/0/19
 switchport access vlan 31
 spanning-tree portfast
!
interface GigabitEthernet1/0/20
 switchport access vlan 31
 spanning-tree portfast
!
interface GigabitEthernet1/0/21
 switchport access vlan 31
 spanning-tree portfast
!
interface GigabitEthernet1/0/22
 switchport access vlan 31
 spanning-tree portfast
!
interface GigabitEthernet1/0/23
 switchport access vlan 31
!
interface GigabitEthernet1/0/24
 switchport access vlan 31
 spanning-tree portfast
!
interface GigabitEthernet1/0/25
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/26
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/27
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/28
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/29
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/30
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/31
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/32
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/33
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/34
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/35
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/36
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/37
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/38
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/39
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/40
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/41
 switchport access vlan 11
 spanning-tree portfast
!
interface GigabitEthernet1/0/42
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface GigabitEthernet1/0/43
 switchport access vlan 31
 spanning-tree portfast
!
interface GigabitEthernet1/0/44
 switchport trunk native vlan 11
 switchport trunk allowed vlan 21,31
 switchport mode trunk
 spanning-tree portfast
!
interface GigabitEthernet1/0/45
 description "Po1-A"
 switchport trunk allowed vlan 4,5,11,12,21,22,31,41,91,92
 switchport mode trunk
 channel-group 1 mode active
!
interface GigabitEthernet1/0/46
 description "Po1-B"
 switchport trunk allowed vlan 4,5,11,12,21,22,31,41,91,92
 switchport mode trunk
 channel-group 1 mode active
!
interface GigabitEthernet1/0/47
 description "Po2-A"
 switchport trunk allowed vlan 4,5,11,12,21,22,31,41,91,92
 switchport mode trunk
 channel-group 2 mode active
!
interface GigabitEthernet1/0/48
 description "Po2-B"
 switchport trunk allowed vlan 4,5,11,12,21,22,31,41,91,92
 switchport mode trunk
 channel-group 2 mode active
!
interface TenGigabitEthernet1/1/1
 switchport access vlan 31
 spanning-tree portfast
!
interface TenGigabitEthernet1/1/2
 description "N/C"
 shutdown
 spanning-tree portfast
!
interface TenGigabitEthernet1/1/3
 description "Po10-A"
 switchport trunk allowed vlan 4,5,11,12,21,22,31,41,91,92
 switchport mode trunk
 channel-group 10 mode active
!
interface TenGigabitEthernet1/1/4
 description "Po10-B"
 switchport trunk allowed vlan 4,5,11,12,21,22,31,41,91,92
 switchport mode trunk
 channel-group 10 mode active
!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan4
 no ip address
!
interface Vlan5
 no ip address
!
interface Vlan11
 ip address 198.18.18.221 255.255.255.0
!
interface Vlan12
 no ip address
!
interface Vlan21
 no ip address
!
interface Vlan22
 no ip address
!
interface Vlan31
 ip address 198.18.1.221 255.255.255.0
!
interface Vlan41
 no ip address
!
interface Vlan91
 no ip address
!
interface Vlan92
 no ip address
!
ip forward-protocol nd
ip http server
ip http authentication local
no ip http secure-server
ip ssh version 2
!
!
!
!
!
!
!
!
control-plane
 service-policy input system-cpp-policy
!
line con 0
 exec-timeout 30 0
 privilege level 15
 logging synchronous
 stopbits 1
line aux 0
 exec-timeout 30 0
 privilege level 15
 logging synchronous
 stopbits 1
line vty 0 4
 access-class SSH in
 exec-timeout 30 0
 privilege level 15
 logging synchronous
 transport input ssh
line vty 5 15
 access-class SSH in
 privilege level 15
 logging synchronous
 transport input ssh
!
!
!
!
!
!
!
end

CyberNBD · ‎01-03-2024

@balaji.bandianything in the config you can see that that would explain the behavior or drops?

balaji.bandi · ‎01-07-2024

not that i see any major difference in the config high level.

on SG side you have flow control - may be default the interface and make it simple access vlan 31 and test it.

also clear the counters on 1/0/23 port and see how fast they output errors are increasing.

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balaji.bandi · ‎12-21-2023

you need to provide more information and configuration configured between the device ?

how is your STP configured on both the device ?

make sure STP always on Cat 3650, if that is your uplink switch in the network /

also try switchport nonegotiate or no speed negotiation.

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pieterh · ‎12-22-2023

>>> port 8 on the SG is the inter-switch link <<<

the SG300-10MPP should have a port-9 and 10 ?

SG300-10MPP

10 Gigabit Ethernet

8 Gigabit Ethernet

2 Gigabit Ethernet combo

=> why not use those?
these ports use different internal hardware / capabilities /resources , designed to be used as uplink.

CyberNBD · ‎12-22-2023

Yes initally I configured a port-channel between 1/0/47-48 on the 3650 and gi9-10 on the SG. To rule out issues with trunks and port chanels I switched to regular access ports as interlink. Issues are exactly the same in both cases.

CyberNBD · ‎12-22-2023

Ok so just to be sure I just moved the inter-link connection to gi1/0/21 and gi9 to rule out port issues or (hardware) errors. Same behaviour remains.

Cisco SG300 series poor performance when connected to Catalyst 3650