I can't ping devices until restarting the switch

[Elbadri]

Hello gentlemen,

I'm facing a rare issue, I have 8 CICSO switches (IE-3000) connected together and each switch has one device connected to it(all these devices are in one vlan).

 I added a new switch in the loop and was able to ping all devices from it but when I disconnected the Ethernet cable from my PC and put it again, I couldn't ping any device.

I restarted this switch, then I was able to ping all devices, when I disconnected the Ethernet cable again from my PC and plug it again, I was not able to ping any device again, and I tried to ping from the other switches in the ring but smae issue is exciting.

But still all devices are communicating to each other, but I can't ping them or get access to them unless I restart the switch.

[balaji.bandi]

 I added a new switch in the loop and was able to ping all devices 

Ring  ?

I can't ping devices until restarting the switch - Cisco Community

Corret us here, if you disconnect PC from ethernet, how does that going to ping ?

i do not see the logic here if PC has no ethernet connection, how do you expect that device in the network ?

or we missing some information here

[Elbadri]

Yes it is a ring, I edited the post I forgot to mention that I plug it again but then I can't ping.

[balaji.bandi]

what is the PC IP address and what is device IP address you trying to ping

[Elbadri]

10.11.12.22X is devices IP

Gateway is 10.11.12.254

PC tcp/IPv4 is 10.11.12.251

[balaji.bandi]

have connected console and checked from switch are you able to ping PC IP ?

how is your STP looks like when you lost the connection.

i would verify the config again -

https://www.cisco.com/c/en/us/td/docs/switches/lan/cisco_ie3000/software/release/12-2_52_se/configuration/guide/ie3000scg/swrep.html

[Elbadri]

Thanks, I will check that.

I have just copied the configuration from one switch and installed it in the new switch, I only changed host name and management IP address, I will check other switches if there is something unique in each switch than need to be changed which differ each switch form the other one, any idea?

[Elbadri]

 vlan 1 has no port configured,

vlan 2 has all 1-4 ports, port#1 is connected to a device, others are spares and I used them to access the devices on others switches 

[Elbadri]

I can't ping my when connected by console.

I compared the configuration between all switches , there is nothing unique and different in thier configuration execpt for IP address and host name.

This issue took place only after adding the new switch in the ring.

I 0 output buffer failures, 0 output buffers swapped out

[Elbadri]

show spanning-tree

VLAN0100
Spanning tree enabled protocol ieee
Root ID Priority 32868
Address 0087.6413.5600
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32868 (priority 32768 sys-id-ext 100)
Address 0087.6413.5600
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa1/2 Desg FWD 19 128.4 P2p Edge
Fa1/3 Desg FWD 19 128.6 P2p Edge

Switch is in pvst mode
Root bridge for: VLAN0100
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
EtherChannel misconfig guard is enabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is short

Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0100 0 0 0 1 1
---------------------- -------- --------- -------- ---------- ----------
1 vlan 0 0 0 1 1

Name: Fa1/2
Switchport: Enabled
Administrative Mode: static access
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: native
Negotiation of Trunking: Off
Access Mode VLAN: 100 (Serial-to-IP)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none

Name: Fa1/3
Switchport: Enabled
Administrative Mode: static access
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 100 (Serial-to-IP)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none

[Elbadri]

I checked the configuration of the switches and found nothing is unique for each switch except for IP address and host name, the issue took place only after adding the new switch in the ring, the Fa1/2 is showing connected and communicating normally with other devices but I can't ping it or Ping other devices in the same vlan , F1/3 is showing down but I'm connecting Ethernet cable to it by PC

[balaji.bandi]

the issue took place only after adding the new switch in the ring

what is the status when you remove that switch and all work as expected.

make sure you understand the how the REP works :

https://www.cisco.com/c/en/us/td/docs/switches/lan/cisco_ie3000/software/release/12-2_50_se/configuration/guide/ie3000scg/swrep.html