Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


ERS 4800 Domain Logon Issue

ERS 4800 Domain Logon Issue

ERS 4800 Domain Logon Issue

I have some ERS 4800 switches running and and on these switches, I have some computers which continually will get "No logon servers available" even though the machine is on the network, and is reachable via ping. Usually physically disconnecting the network cable or bouncing the port will resolve the issue. Has anyone else run into this, or a similar issue? I have been banging my head against the wall trying to come up with an explanation. The machines are Lenovo M92P. I don't recall this issue happening on the 5.8 code, but people can't give me a definitive answer as to when the problem started of course. I needed to upgrade to 5.8 to fix a PoE issue, so rolling back isn't an option.

A little additional testing/information. The machines are frozen with DeepFreeze, so that after every restart they are as if they were just imaged. We are using APR inspection and DHCP Snooping on the VLan those machines are on. If I trust the ports for ARP inspection, they appear to work just fine, even though the machines aren't statically addressed.

RE: ERS 4800 Domain Logon Issue

Try mirroring the port to a sniffer to see what source ip addresses are being used when the PC restarts.

also look at the binding table to see if there is an entry for the PC

# show ip dhcp-snooping binding

RE: ERS 4800 Domain Logon Issue

does the port autonegotation or fix ?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members!

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close