Cisco :: 5508 / 3500 / 1200 - Network Fluctuation
Nov 20, 2011
we have a wireless network composed by Cisco Wireless LAN Controllers (WLCs) and Access Points (APs) providing access to a large university.
For WLC we're using the 5508 model (four controllers in total) with the latest software version - 7.0.220.0.
For APs we're using the 3500 Series (AIR-CAP3502I-T-K9) and the 1200 Series (AIR-LAP1262N-T-K9), also with the latest version (upgraded automatically by the WLC). We have around 200 APs. We have established V LAN's specific for the dynamic interfaces (providing the W LAN's) and a management V LAN's (id 254). Our users are experiencing performance issues with the network, specially when the number of users connected is high (around 1700~2000 users).
Analyzing the packets received by a client, we detected a lot of Gratuitous ARP packages originating from the WLCs, for each APs. According to Wire shark:
No. Time Source Destination Protocol Length Info
31 31.954314000 Cisco_61:xx:xx Broadcast ARP 42 Gratuitous ARP for NNN.NNN.254.63 (Reply)
33 32.552240000 Cisco_61:xx:xx Broadcast ARP 42 Gratuitous ARP for NNN.NNN.254.236 (Reply)
34 32.559302000 Cisco_61:xx:xx Broadcast ARP 42 Gratuitous ARP for NNN.NNN.254.115 (Reply)
35 32.616899000 Cisco_61:xx:xx Broadcast ARP 42 Gratuitous ARP for NNN.NNN.254.171 (Reply)
[ code]....
Cisco_61:xx:xx is the WLC mac. All these IP addresses (NNN.NNN.254.XXX) are APs.
As you can see, the clients are receiving broadcast related to the APs in the management V LAN (254). In our understanding this traffic should occur only between WLCs and APs. We are already using two separate ports in the WLCs - one for the 254 V LAN (management) and other for the dynamic interfaces (W LAN's).
We have left a ping command running in the client, and have noticed that when the clients receives many of these broadcast the connection fluctuates. Such broadcasts from the management network in the W LAN's are expected behavior?
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Mar 15, 2013
I have an XPS L502x laptop with an Intel Centrino Advanced-N 6230 wireless card. For the past couple of weeks the strength of the signal as measured by the Intel proset tools goes from excellent to poor in the space of 60 seconds, back and forth. It seems to do this on all channels from 1 to 13. It definitely is affecting Internet performance. I have the security set at WPA-Personal in an attempt to try and stabilise the network. I have also been using iSSIDer to try and find the best channel since there are about 10 other wireless networks from other houses around me. I have a D-Link 645 router which is admittedly about 10 metres and 2 or 3 walls away. However, until a fortnight ago, the network was dead stable showing a strong signal (4 or 5 bars (-50). Now it is all over the place. Could it be a damaged card?
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cannot set role in radio network to when another radio is set to one of the above roles
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Jun 3, 2004
I run into a 1230 that would have a Web page completely different than the usual one. Instead of getting the normal User/pass menu and then the menu on the left side frame, you get this:
Cisco Systems
Accessing Cisco AIR-AP1220-IOS-UPGRD "1200AP"
Web Console - Manage the ap through the web interface.
Telnet - to the router.
Show interfaces - display the status of the interfaces.
Show diagnostic log - display the diagnostic log.
Monitor the router - HTML access to the command line interface at level 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
Extended Ping - Send extended ping commands.
Show tech-support - display information commonly needed by tech support.
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Jun 9, 2012
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This is what i've done:
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- Made a new interface "AP2" with IP-Address 192.168.1.10 (/24), default gateway 192.168.1.1. Primary DHCP server: 172.167.1.30
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I have a Cisco 1200 Series (AIR-AP1231G-A-K9) access point, I have been upgrading these models to lightweight mode but are having issues with one in particular, this access point keeps "rebooting" itself, I am assuming that the upgrade failed, how can I get the access point upgraded?
When I start to access the AP by typing "enable" and enter the password it starts resetting again.
I have reset the AP by the mode button, power option but still not working.
At this point I would even accept a fix to get it back to working condition. Here is a capture.
Cisco IOS Software, C1200 Software (C1200-RCVK9W8-M), Version 12.3(11)JX1, RELEASE SOFTWARE (fc1)
Technical Support: [URL]
[Code].....
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.
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