07-28-2009 07:13 AM
I wanted to add a Mikrotik RB411a to my network as a wireless access point. When I plug it into the Catalyst 3750g switch, the switch blocks traffic to the MT. I talked to the company that set up the network, and they told me that only Cisco wireless AP's could be used. Is that true?
07-28-2009 04:05 PM
Well, that's not true.
What is the RB411, a card in a motherboard or an actuall Access-Point?
Does it require power (PoE) from the switch?
When you say " switch blocks traffic to the MT" what do you mean, please explain further...
07-28-2009 05:22 PM
It is a radio card on a small motherboard. It has its own POE, which I'm using (or it can optionally use a plug in adapter).
By "block traffic" I mean that I can't ping it, ssh to it, telnet to it, or see it with WinBox (the Mikrotik administration software) when on the wired network. Clients can connect to the wireless side, but can't see past the AP.
The port on the Cisco switch gives an error and disables itself. Sorry, I don't have the actual error in front of me. I did some reading today and I think that there is some sort of port security. I'm just not a Cisco guy and wanted to investigate the claim that there was some sort of incompatibility and "it just plain wouldn't work." I believe that it is a configuration issue in the Cisco.
Would you agree?
Thanks!
07-28-2009 06:52 PM
Can you post the configuration of the switch port you are trying to connect the RB411 to? I also would like to see the configuration of the uplink ports.
I've worked in the network industry since 2000 and everytime there's a problem, networks cops the blame. My computer monitor is not working - blame networks. The elevator is stuck - blame networks. My wife just left me - yup, networks.
[EDIT: Apologize for anyone offended by the last comment.]
07-29-2009 05:46 AM
Didn't you get the memo: It's called "guilty until proven innocent". :D
And then the network peeps turn around and "shoot the messenger", claiming the "router down" alert received 10 mins ago was a bogus alarm, because the router is now pingable 10 mins later.
07-29-2009 05:54 AM
Maybe they were referring to some STP incompatibility between Cisco and Mikrotik, such as ones like this?
07-29-2009 06:55 AM
07-29-2009 06:57 AM
when the MT is plugged in, I get at "port is error-disabled" message
07-29-2009 10:04 AM
I think I was able to turn off port security like this:
config t
int Gi1/0/30 (I'm working on port 30)
no switchport port-security
end
But the port is still disabled.
I'm trying to re-enable it using
set port Gi1/0/30 enable
but I get
% Invalid input detected at '^' marker.
(erring at port)
if I do a set ? "port" is not an option
how can I re-enable the port on a 3750?
07-29-2009 10:35 AM
one other tidbit:
I downloaded the Cisco Network Assistant, and I got a more complete error:
ethernet link err-disabled
unexpected bpdu received
07-29-2009 08:13 PM
Can you post the configuration of the switch port you are trying to connect the RB411 to? I also would like to see the configuration of the uplink ports.
Is BPDU Guard enabled globally or at the interface level?
07-29-2009 11:35 PM
it seems that the port goes in err-disabled due to detection of a BPDU packet. I assume that the port is configured for spanning-tree portfast. This is an end-host port featutre to bring the port up and running as quick a possible. If there is another network device attached at such a port (which is expected to be an end-host port) and BPDU packets are detected the port will be shutdown to prevent a possible loop.
Remove the "spanning-tree portfast" feature from that port and enable it again with "no shutdown"
Issue the following commands:
conf t
inter gi 1/0/30
no spanning-tree portfast
no shutdown
end
write mem
(the last command is to make these changes permanent accross reboots)
to see the syslog messages when you are on the device do a:
show logging
07-30-2009 03:34 AM
I posted it about 4 or 5 messages back... it's the only post on this thread with an attachment.
Thanks!
07-30-2009 03:39 AM
Sorry, I haven't seen this post. But according to this config, try what I wrote in my last mail and see if the port comes up and stays online.
07-30-2009 06:20 AM
thanks, I'll give it a try and post back here
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