Castlewood
asked on
Some VLANs become inaccessible on Cisco C3560 switch.
This C3560 switch used to be working well. Its port25 uplinks to the core switch and allows VLAN 2, 3, 5 - 7 and 100, as shown in the config attached. While one of our guys was working on updating each port description, all of sudden, only ports of VLAN7 and 100 are working while all others are not. "Not working" means unable to ping the servers via those ports. So we restored config from a good backup but still to no avail -- what a bummer!
After we picked one port and issued 'switchport access vlan x' one by one for all non-working VLANs, all became working in the beginning. But minutes later we noticed VLAN 2 and 3 are NOT working again while others remains working. What could be wrong? How to resolve this issue? Please help. (Please refer to the config attached.)
c3560-7-no-vlan2-3.txt
After we picked one port and issued 'switchport access vlan x' one by one for all non-working VLANs, all became working in the beginning. But minutes later we noticed VLAN 2 and 3 are NOT working again while others remains working. What could be wrong? How to resolve this issue? Please help. (Please refer to the config attached.)
c3560-7-no-vlan2-3.txt
Do you vtp pruning on? Have you looked at the vlan interfaces to see if they are up or down?
no config attached
ASKER
Oops, just uploaded. Sorry.
ASKER
Hi Andy, vtp pruning is not on. And no result from show interface vlan as only vlan 100 and 1 are defined with interface.
Let me update this case -- all VLANs are working now after I issued 'switchport access vlan x' one by one for the broken vlan 2, 3, 5 and 6 but two questions remain:
#1. When the issue occurred in the beginning, I did restore previous config from backup but it didn't help at all -- the issue remained till I did the following #2. Why doesn't restoring the previous config come to help?
#2. So I issued 'switchport access vlan x' one by one for 2, 3, 5, 6, and it prompted "Access VLAN does not exist. Creating VLAN x ..." Does it mean VLAN 2, 3, 5, 6 were somehow deleted from this switch? How could they get deleted?
Let me update this case -- all VLANs are working now after I issued 'switchport access vlan x' one by one for the broken vlan 2, 3, 5 and 6 but two questions remain:
#1. When the issue occurred in the beginning, I did restore previous config from backup but it didn't help at all -- the issue remained till I did the following #2. Why doesn't restoring the previous config come to help?
#2. So I issued 'switchport access vlan x' one by one for 2, 3, 5, 6, and it prompted "Access VLAN does not exist. Creating VLAN x ..." Does it mean VLAN 2, 3, 5, 6 were somehow deleted from this switch? How could they get deleted?
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