I found one of our 18 AP's was cycling red, green, blue on the LCD.  I enabled SSH on the AP and saw in the logs that it seemed to indicate the PoE negotiation was failing (LLDP).  The other end is a Cisco 3750X with both CDP and LLDP enabled globally, but on a few of the 3802i AP ports the command no cdp enable is on, and working fine for many of these AP's.  For some reason I had to go into this interface and run cdp enable and now this particular 3802i AP negotiated up from 15 watts to 30 watts and the radios became active.   I'm not sure why some of these AP's need CDP and some do not.  Now my switch is spamming me in the logs which is why I turned CDP off on this AP in the first place.  I read this is a bug.   %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet5/0/8 (not half duplex), with 1600mdAP3 GigabitEthernet0 (half duplex). (ptn-access-c-5)   The controller is a 5508 WLC running 8.3.141.0. Any way to keep CDP enabled but to stop that logging?  I think I can just disable all logging on that port.         ... View more

We are using OSPF as our interior routing protocol with all default timers.  I've tested failover between sites and if I manually disable one WAN path, a constant ping from a Windows PC will drop for 8 cycles and then it will re-establish connectivity.  I do not think a single ping cycle in Windows is 1 second, so this is a bit of time to re-establish connectivity via an alternate path.   I was reading up on BFD and I would like to try enabling it, at least on the links between our HQ and one of our other sites for testing.  The site is connected via two links, an 802.11n wireless bridge between rooftops, and a 40mbps fiber private connection from a local cable operator.   My concern is, if I enable BFD on one side, will my OSPF adjacency be marked down because I have not completed the configuration on the other side?  If I enable BFD on this side, the other side is not yet participating in BFD, so therefore this side will never get BFD packets back and mark that OSPF path as down.  This means an 8 to 30 second network outage that would drop voice and video calls in the other building.   So what is the best way to enable BFD without accidently having it mark OSPF paths as down?   I would be doing this between Cisco and Extreme Networks gear.  On Extreme XOS, the default default transmit and receive interval is 1000ms unless specified otherwise.  I'm not sure what Cisco IOS default is, or if you must specify.  I would imagine they need to be specified the same.     ... View more

I have a Cisco 5508 WLC that currently has 4 copper RJ45 gigabit SFP modules plugged in and uplinked to our core.  Our core has many of its copper 1/10 Gbps interfaces used so we are migrating anything we can to fiber SFP since those slots are plentiful.   If I remove these copper SFP's from the Cisco 5508 and replace them with Fiber optic 850 nm mm 1gbps SFP's, is there anything else I would have to do on the WLC?   The reason I ask is that on a Cisco 2901 router in an EHWIC card, you can insert the fiber optic SFP, but it does not go live until you go into the interface and issue a shut, then a no shut command... then the ehwic sees the fiber optic SFP inserted and prefers that interface.  Is there anything similar I need to do on the WLC, or is it all hot swappable?   We are on WLC version 8.3.141.0. ... View more

Hello, I have a 2901 router with 4 active copper interfaces (two on board and two in two EHWIC-1GE-SFP-CU cards).     I would like to migrate the copper link from the EHWIC cards to a fiber optic connection to our core switch, solely due to us having many more available fiber optic ports open, and we are running very low on copper 1/10 gbps ports.   I would start with Gi0/0/0 which is a backup link so it could be done during the day, but Gi0/1/0 would have to be done after hours.   The config for Gi0/0/0 has 3 vlans, ip addresses dot1q encapsulation and an ip ospf message-digest-key 1 md5 command on them.  If I plug in an SFP right now into this EHWIC card, which media or interface will the 2901 router utilize with the config on these Gi port numbers?  Will the copper port go down?  Or will the fiber optic cable not link up until I unplug the copper port?  Though it is a backup link, I want to do this as quickly as possible for practice for the other EHWIC card which is a mission critical interface.   ... View more