crispybits

Yep there were VLANs set up previously on the old switches - we had a switch config guy come in the other day and he removed a load of VLANs from our network he said he thought were legacy and not used any more - does this mean it's likely to be the servers were on one of those VLANs and now we'll have to do some config on them? He's back in on Tuesday and obviously it's the holidays right now so if it's something like that I'll leave it until he comes back in. I'm a PC tech so while I know the basics of networking I'm not knowledgable enough to tackle a problem like that on a network the size of the one we use unless it's simple enough for someone to give me a step by step in here.

I can ping the core from the switches. Ping times coming in around 3-4ms. Pinging from a workstation directly plugged into the core gives me a 1ms ping to the switches. I am getting a DHCP Server IP address from ipconfig /all on the workstation The error when I try to login one of the PCs that's gone down is the standard "There are no logon sevrers available to process your request" as if the ethernet cable is unplugged (I have checked they are still plugged in locally and patched at the switch before I started the thread) Here is the config from the show conf on one of the new switches: Startup configuration: 5 ; J9728A Configuration Editor; Created on release #WB.15.17.0007 ; Ver #07:eb.8f.fc.f3.ff.37.2d:89 hostname "A5-2920-48G" module 1 type j9728a timesync sntp sntp unicast sntp server priority 1 XXX.XX.XX.20 ip default-gateway XXX.XX.XX.254 ip ssh filetransfer snmp-server community "public" unrestricted snmp-server community "mw-snmp" operator unrestricted snmp-server community "mw-snmp-read" operator snmp-server host XXX.XX.XX.6 community "public" snmp-server host XXX.XX.XX.20 community "public" snmp-server host XXX.XX.XX.204 community "mw-snmp" trap-level all snmp-server host XXX.XX.XX.14 community "mw-snmp-read" snmp-server host XXX.XX.XX.219 community "mw-snmp-read" snmp-server contact "MSh" location "C1-Server Room" oobm ip address dhcp-bootp exit vlan 1 name "DEFAULT_VLAN" untagged 1-48,A1-A2,B1-B2 ip address XXX.XX.XX.73 255.255.252.0 exit no tftp client no tftp server no autorun no dhcp config-file-update no dhcp image-file-update password manager (apologies for the XXXed out IPs, I'm not a network guy so I don't want to accidentally publish something on the internet that may cause a security issue - the numbers under the XXXes are what I would expect to see)

Hi everyone My network manager is away on holiday right now, and I'm having a very weird (to me) problem. We've just upgraded our network to 10G fibre and installed a load of new HP 2920 switches. The default vlan is set up on them but not much other config has been done. Several computers around the school (more and more with each passing day) that were previously able to log in via the new switches are now getting no connection to our login server, or at most an intermittent connection (they will log in fine then 2 hours later no login server is present). The NIC light on the back has also changed from green to red in the majority of cases. I've tried googling but the solutions I have found are all related to home networks and unmanaged switches. Seeing as the issue is affecting multiple PCs all over the site I don't think those answers will be particularly relevant (though I am prepared to try one or two with reinstalled drivers if that's worth it?). Is there something in the out-of-the-box switch config that may be causing this? Any hints or tips in how to investigate an resolve this issue would be very much appreciated!