About blin

blin · 12-08-2010

One of our Cisco 3560 switches keeps showing this warning: Description: Gi0/15: Detected a Loop back. Port has been Disabled. Recommendation: Check Configuration of the switch, also make sure devices connected to the switch are not mirroring the traf...

blin · 12-08-2010

One of our Cisco 3750G switches keeps showing this warning: Description: Gi4/0/43: Unexpected BPDU received. Port has been Disabled. Recommendation: Check Configuration of the switch, also make sure devices connected to the switch. Enable this port a...

blin · 12-30-2009

We hired a consultant to replace PIX (default gateway) with ASA and 3650 switch (core) with 3570. The VLAN 1/private network works fine. However, all VLANs such as vlan 100, 200, and 300 and 400 don't work. Then the consultant tried many hours to mak...

blin · 05-26-2006

I setup Cisco PIX 515 in my lab to test IPSec VPN. The PIX is behind a Linksys WRTP54G router and UDP port 500 is open. I can establish the VPN in the LAN, but I get not connected error if I test it from a remote office that is behind another PIX 515...

blin · 04-27-2006

The client has a Cisco 1841 router in the main office. They have 10 remote offices. They are planning setup wireless network in each remote office and connect to the main office via VPN. Which wireless router (less than $200) do you recommend to buy?...

blin · 12-23-2010

Solved: I found the problem is VTP password doesn't match. the similar case can be found here: New created VLAN doesn't work on some of switches - http://www.chicagotech.net/netforums/viewtopic.php?f=5&t=14236

blin · 12-21-2010

The Cisco Engineer checked the log and found that happened on 6/21/2010. This is possible the day our consultant added the switch. Since we had multple ports were configured to use fastport and bpduguard, he removed these lines from all ports.Thank y...

blin · 12-10-2010

OK, I will open a case with cisco and will post the result back. Thank you.

blin · 12-09-2010

Update. Now, another port Gi4/0/48 has the same error (see attached screenshot). The switch is located my next door and no one in the room today for sure. No device connecting.BG3750_1-1#sh int gi4/0/48 statusPort Name Status V...

blin · 12-09-2010

I have removed “spanning-tree bpduguard enable” at 2:11 PM. The below is the result. I will monitor and will post back. One more question, we hired a Cisco Engineer to configure all switches for us and most ports are configured “spanning-tree bpdugua...

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Detected a Loop back. Port has been Disabled

Unexpected BPDU received. Port has been Disabled

VLAN doesn't work after replacing core switch and route

VPN Client not connected error

VPN to 1841 router

Re: VLAN doesn't work after replacing core switch and route

Re: Unexpected BPDU received. Port has been Disabled

Re: Unexpected BPDU received. Port has been Disabled

Re: Unexpected BPDU received. Port has been Disabled

Re: Unexpected BPDU received. Port has been Disabled