Cisco WAN :: 3750 EIGRP Session Flapping For Seconds / Minutes

Apr 9, 2013

we are facing issue for unstability of EIGRP neighbor with ISP router.Both router are connected via 3750 switch.There is no misconfiguration or physical media issue.I found the SDM template on the middle switch is desktop default, does this will impact ? [code]

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Cisco WAN :: C2921 - EIGRP Flapping Through Sub Interface

May 8, 2012

I get some EIGRP flapping on my CE router (c2921) 2 sub interface to another two site. The router IOS version "c2900-universalk9-mz.SPA.152-2.T1". I capture the debug log as attached. I know understand some log meaning from the debug.

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Cisco Switching/Routing :: 1941w - EIGRP Continually Flapping

Nov 15, 2011

This is the message that I am getting from my 1941w router. I have a isakmp tunnel built with a GRE tunnel going through it.

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Cisco WAN :: 888-K9 CO And CPE SHDSL Connection Flapping Every Few Minutes

Jan 17, 2013

I have two Cisco 888-K9 setup on a 4 wire private line about 2-3 km apart one configurated as CO and the other as a CPE. During config and testing the SHDSL connection was completely stable although this was only over about 300m of CAT5e. Now the devices are installed the in field I'm finding the connection constantly comes up and down every minute or so which leads me to suspect noise or line quality is the issue. How to debug this and tweak the setting to improve stability? Config from the CO & CPE attached along with DSL controller output from active and non active connection on the CO.

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D-Link DIR-825 :: Internet Session TCP Timeout So Low - 120 Seconds?

Mar 1, 2013

I have a DIR-825 with 2.60VT firmware (rented from Videotron).

Even though the manual says the stateful firewall should have a timeout on connections of 240 seconds or 7800 seconds, all of my connections start at a mere 120 seconds. I'm having trouble with IMAP IDLE pushing e-mails because the connections timeout so quickly (before any stay alive can be sent). A connection to the e-mail server gets opened on 143 (Videotron) or 993 (encrypted - google, e.g.), and I see the connection on the Internet Sessions page, the timeout starts at 120. When it hits 0, the connection is no longer displayed (it is not renewed), and the IMAP IDLE ****s out because the server can't find the client (i.e. the connection has been closed). But it's not just on those ports or servers. ALL of my TCP sessions begin at a mere 120 seconds! Even for a home router, isn't this way too low?

confirm that their DIR-825, on the Internet Sessions page, shows initial timeout values of greater than 120 for a TCP connection? I would love to see a picture of that screen showing higher values. Does it start at 240? Do you ever see a connection start at a timeout of 7800?

I see no way of changing the timeout value. Is it possible to force connections on certain ports to begin at a higher timeout value?

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Cisco WAN :: 1841 / All Sessions Simultaneously Fail EIGRP And Restored Within Seconds

Nov 18, 2012

currently on my Cisco 1841 router I have configured EIGRP protocol, my problem is that all sessions simultaneously fail EIGRP and restored within seconds, all come from different sources. The IOS version is 12.4 (25g).

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Internet Goes On And Off Every Few Seconds / Minutes?

Dec 27, 2011

So I got a computer upgrade for Christmas. Basically, what it did was replace my crappy onboard graphics card for a decent card to play games better. I also replaced the 250W power supply with a 430W supply (the card needed 300W). Ever since I upgraded, my internet goes on and off all day, only for me. (everyone else doesn't seem to have the problem) We did not touch the internet router at all, and it's wireless by the way. Something must have changed when I put the upgrade in, but I don't know what. the worst thing is, I can't play any multiplayer games now because when I go into a 60-90 ping server I end up hitting 250 ping and teleporting all around. I can't do youtube anymore because my internet goes off and on and off and on. My computer is now basically useless. I'm not allowed to touch the router, but I doubt it's the internet's fault considering it's only me. As I'm typing this, I'm copying the message in case the internet goes down again.

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Random Disconnecting For 10-20 Seconds Every Few Minutes

Mar 26, 2011

So...few days ago this is happening even more frequently, my service is from Verizon wireless. Its getting really annoying when i randomly disconnecting while im doing something important or its so slow it takes 4 minutes to load one page. Im in the basement so is my modem. Im using windows 7.

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Wireless Internet Goes Off And On Every Few Seconds Or Minutes?

Dec 29, 2011

I'll start with the beginning of the problem to see if there is a way to fix this.At Christmas I got a graphics card upgrade and power supply upgrade to play games better on my computer. Roughly, from what I can tell, ever since then my computer and my computer only has been having this horrible internet problem. The internet constantly either slows down or totally goes off for seconds or minutes when loading websites, watching youtube, and playing online games. I got this upgrade to play games like Battlefield 3 and various higher requirement games, most of which were multiplayer. Now I cannot play any of them because when I go into an american server with 60-90 ping, I get 200-400 ping and teleport all around like crazy. Makes playing the game impossible. When watching youtube, the video will stop buffering and my whole internet for my computer will shut down and about 1-5 minutes later, it will come back up and load the video.

I might just even be on the web and I try to load a page and bam, Firefox could not load page. I use firefox, windows 7 home premium 64 bit. Model is HP pavilion p6654y. It is not the internet causing the problem from what I can tell because we have not touched the router or modem or anything. Sadly, I do my school online and if I cannot get this fixed by tuesday when school starts next week I am totally dead. I have tried updating drivers, updating java and flash player, using different web browsers,(which wouldn't work anyway because my games would still work badly) I have also scanned multiple times with Kaspersky anti-virus 2012. I know that my computer hasn't slowed down, it's the internet on my computer that has. Singleplayer or non-internet activities work faster than ever of course

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Internet Disconnects For 5 Seconds Every 30 Minutes Or So

Sep 29, 2012

So lately I've been having this problem where my internet decides to stop working for about 5 seconds every half an hour or so which gets kind of annoying if i'm in the middle of an online game or anything else that requires an uninterrupted connection. When it occurs none of the lights on the modem change and all of the other computers connected to it do not disconnect, only my computer is disconnecting.

So far I have tried changing the ethernet cord, switching ports on the modem, updating all of my drivers, and going into the device manager to disable the cut power to device option on my ethernet card. but none of these seem to alleviate the problem.

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Every 5 Minutes Keep Getting Disconnected From Internet For About 30 Seconds

Jan 2, 2012

Every 5 minutes or so I keep getting disconnected from the internet for about 30 seconds. It gives me the error "Error 105 (net::ERR_NAME_NOT_RESOLVED): Unable to resolve the server's DNS address." This is in Google Chrome. This occurs when i'm playing Star Wars: the Old Republic.

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Internet Disconnects Every 5-10 Minutes For 5 Seconds

Sep 11, 2012

I can give is that every 5-10mins my internet cuts out for about 5 seconds, just long enough to kick me out of a game if I'm playing one.. so it's beyond frustrating. I use a toshiba laptop and it was recently reformatted. These stupid dcs used to happen before the reformat.. they'd happen one week then stop the next. after the reformat which was done (hopefully professionally) by geeksquad, infact they gave me a new hard drive too cause my old one heated up real fast, I was fine for a few months and now like a sickness it has strucken me again. So far it's been a week of nonstop disconnects every 5-10mins... it actually did stop for about 12hours today but I rebooted and then it started again.. so there IS a way to fix it, I just don't know what I did.I am 100% certain it's not my wireless connection, the same thing happens with an ethernet cord. the ipconfig flushdns stuff, and the netsh winsock reset stuff. also of course i've done various virus scans i'm fairly certain that's not the issue.

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Home Network :: Internet Lost Every 14.75 Minutes For 10 Seconds?

Mar 2, 2011

As mentioned in my topic title, I am losing my internet connection every 14.75 minutes for about 10 seconds at a time. I've tried another website (Tech Guy Support networking forum) and I've come to a dead end. I though maybe that a site more dedicated to networking. but in the interest of saving time and making sure I've got everything formatted correctly, I have a few pictures that will clarify what is going on as well.

I'm at wit's end with diagnosing the problem and I don't know what else to try to get my network to stop acting up. Finally, here is my detailed problem and all the steps I've taken to troubleshoot the network. [URL]. Here is a picture of my network setup for those who want to jump to a picture: [URL]

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D-Link DIR-601 :: Loosing Telnet Connection When Leaving Session Idle For Only Few Minutes

Mar 4, 2013

Not sure where the best place to drop this question.  It is a DIR-601 router.  I have it configured in the virtual servers list as; internal system ip, public port/private port both 23, protocal tcp with inbound filter, allow all and schedule set to always.  I have a second system with a different public port.  I can connect to either one but after a short amount of idle time it appears to just drop the connection.

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Cisco Wireless :: Etherchannels Flapping / Stacked 3750 To WLC5508?

Feb 18, 2013

We're running two 5508 WLCs running 7.0.235.3 pushing out 7 WLANs.  They are both live.  Each WLC is connected to the same stack of 3750G running 12.2(44)SE6 via Etherchannels.I'm getting tons of MAC flapping errors similar to this:9373213: Feb 19 10:53:54.564 CST: %SW_MATM-4-MACFLAP_NOTIF: Host 843a.4b3c.4cec in vlan 752 is flapping between port Po12 and port Po11Each portchannel consists of ports on each of the two switches in the 3750 stack.  Only VLAN 752 shows the flapping activity. LAG is enabled on the each of the WLCs.  The portchannel and interface configs are identical, minus the channel-group command of course.Maybe completely unrelated....looking at CDP neighbors from the switch is incorrect:

WLC1             Gig 2/0/44        157            H       AIR-CT550 Gig 0/0/1
WLC1             Gig 1/0/21        157            H       AIR-CT550 Gig 0/0/2
WLC1             Gig 1/0/20        157            H       AIR-CT550 Gig 0/0/3

[code].....

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Cisco Switching/Routing :: 3750 - VLAN Flapping Error Message

Sep 15, 2012

I recently upgraded my network to have two 3750x core, one interface on the Cisco is connecting to a Net gear switch via a fiber converter. I am keep getting the vlan flapping error message in my log as below.
 
003396: Sep 17 01:46:16.328: %SW_MATM-4-MACFLAP_NOTIF: Host 5c0e.8ba7.0a5c in vlan 2 is flapping between port Gi2/0/15 and port Gi2/0/13
003397: Sep 17 01:46:19.843: %SW_MATM-4-MACFLAP_NOTIF: Host 5c0e.8ba7.0a5c in vlan 2 is flapping between port Gi2/0/15 and port Gi2/0/13
003400: Sep 17 01:49:58.769: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/17, changed state to down
[Code] .....
 
After my research i think this is a looping issue but I'm unsure how to address it.

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Cisco Switching/Routing :: Error Message Ports Flapping On 3750 Stack

Aug 27, 2012

I am receiving the following error message on a Cisco 3750 switch stack. Need troubleshooting this error message.

00:03:13: %SW_MATM-4-MACFLAP_NOTIF: Host 00d0.7400.2730 in vlan 600 is flapping between port Gi2/0/3 and port Gi2/0/2

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Cisco Switching/Routing :: 3750 Stack To Upstream ISP Separate Switches - MAC Flapping

Mar 11, 2012

I have an issue with a Cisco 3750 switch stack which is connected to two seperate upstream Cisco 3750's which are administered by an ISP.  The ISP is experiencing MAC address flapping from one of my VLAN SVI's i am using to route traffic upstream
 
[code]...
 
As you can see I utilise a VLAN SVI to route traffic to the upstream 1.1.1.2 (illustration only) IP.  As per the diagram of the topology attached, the ISP is receiving a MAC address flapping error confirming the SVI MAC address from my switch stack is being learnt on the trunk port connecting switch 1 and switch 2, and also the port (Gi1/0/48) directly connected to my switch stack. As these are all Layer 2 links essentially being passed upstream and then connected between the two ISP switches, we have a 3 way triangular loop formed.
 
If I was to remove the port channel configuration from the two ports associated with the VLAN SVI, am i right in suggesting this would still form a layer 2 loop?  The two ports would still be a member of the SVI VLAN, and it is the VLAN MAC address which is being learnt by the two ISP switches on different interfaces.

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Cisco WAN :: 3750 EIGRP Adjacency Dropping

Mar 3, 2013

I have a production L3 3750 stack with 2 WAN connections, which is connected to the companies WAN infrastructure using EIGRP.Recently there have been a number of hello drops from one site, which is causing the EIGRP adjacency to drop and so the whole site goes down from the rest of the WAN. Physical cabling has been replaced towards the ISP router, and the ISP have found no issues on their equipment or circuit.on occassions the utilisation is high on the link, so reasons for the hello packets to be not reach the end point, but other times the links are lowly used.The WAN links are active/standby, so the active is always used, but the EIGRP adjacency is dropped by both links.

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Cisco WAN :: 3750 / EIGRP Stub At The Edge?

Apr 24, 2012

I am looking to implement 25 Cisco 3750 switches with IPBASE image at the edge, across many cabinets.  I understand I am limited to EIGRP Stub on the 3750 switches (with IPBase) and cannot acheive funding to upgrade to IPServices.  Though I am not fully aware on the limitations, in terms of what I am trying to acheive.
 
Broadly speaking I want to install 2 x 3750 switches at the edge, with point-to-point links to two 6500 core switches (at the data centre) and then have HSRP interfaces on the 3750's, tracking the up links to the core switches.  I am presuming this will be the best solution to ensure reliability.My 6500 switches run EIGRP and have many VLANs and other L3 networks advertised, which will need advertising to the 3750 switches.  I would be looking to advertise two or three HSRP networks on the 3750 switches, up to the core switches.At the moment, the entire network is Layer 2 (VLANS + STP).
 
how to configure EIGRP across the 3750 switches and 6500 switches to allow for the 3750's to see the whole network and also advertise back up it's directly connected (HSRP) networks to the core.  At the moment, after configuration, none of the switches see each other as EIGRP neighbours but can ping the L3 addresses on each end.

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Cisco WAN :: EIGRP Passive Interface With 3750

Apr 26, 2011

I have 3750 switch and there are couple of vlans.....i dont want to run the instance on all vlans....so i have decided that i will run passive intreface default command....now my lan link is layer three and i want to run eigrp on that so the command shd be as under?
 
no passive interface default interface gig1/0/10
no passive interface default interface gig1/0/22
 
(as i have 2 conections) and want to have two neibours.

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Cisco WAN :: 3750 L3 / EIGRP Load Balancing While Running HSRP?

Dec 15, 2010

I'm trying to configure load balancing on a network that is using 4 3750 L3 switches.  The network is comprised of two sites with two switches at each site running HSRP and the virtaul IP is the gateway for a server between the two switches.  The sites are connected by two independant 200meg ethernet connections (technically they are GigE limited to 200meg) p2p circuits.  The switches at site A are connected together via a GigE port and the server I have connects to each switch at its respective site using a GigE port and the same for site B.
 
The problem I'm running into is that I've noticed that one of the 200meg circuits is always idol unless the primary goes down, so I'd like to be able to load balance the traffic from site A to site B using both p2p circuits.  I think the problem that I'm running into has to do with the fact that HSRP is putting one of the links from the server to switch in standby unless the WAN link goes down and therefore traffic is not taking the "longer route" to the 2nd 200meg circuit.The only traffic going across this network is only the two servers sending traffic to one another. how I can get load balancing to work or if it is a possiblity with this network topology?

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Cisco Switching/Routing :: 3750 - Enable EIGRP Process

Sep 23, 2012

I have a hub and spoke WAN that conisits of one core location with with a 6500 and nine other buildings using 4006 Catalyst that conenct back to the core via dual gig fiber. We are using EIGRP at each location as well as the core.   I was tesing something at one of our buildings decided to hang a 3750 off the 4006 and enable the same eigrp process on the 3750 that is enabled on the 4006 and 6500 (EIGRP 1).
 
1. All the routes that the 6500 knows about are advertised out to each of the nine locations.
2. The 4006's are all advertising thier directly conencted routes to the 6500.
 
Onto the location I was testing at:
 
The 4006 where I was testing at has four vlan interfaces enabled and they are in an UP/UP state. The ip routes from the 4006's directly conencted vlan interfaces propogate to the 6500 at our core location and the 6500 sucsefully propgates these learned routes to all the other 4006's.
 
This past Friday I configured a 3750x with two /22 vlan interfces and one physical gi port with an IP address and also configured on Ethernet port on the 4006 with an IP address in the same network block as the 3750x gi interface (a /30 netowrk block). I saw both interfaces come up and EIGRP sucesfully established a neighbor adjecency between the 3750x and the 4006.
 
I noticed that the 3750 advertised out all of it's directly conencted routes to the 4006 and the 4006 advertised it's directly conencted routes to the 3750. However, the 4006 did not advertise any of the routes it had learned from the 3750x to the 6500 and nor did the 4006 advertise any of the routes it had learned from the 6500 to the 4006.  My suspicion is that the "eigrp stub connected summary" statement is enabled on both the 4006 and 3750 thus prevenintg them form advertising out any routes other than thier directly conencted routes.  Can any of you verify that I'm either correct or inccorect about this?
 
here are the eigrp statemnets from the 6500 and 4006:
 
6500:
router eigrp 1
redistribute static
network 10.0.0.0
network 172.16.0.0
network 172.17.0.0(code)

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Cisco WAN :: EIGRP Not Fully Passing Routes After Introducing 3750

Apr 8, 2013

We've put in a 3750 at our corp hq (Detroit).  We did this to break up the current flat 172.16.0.0 /16 network into separate VLAN's for various purposes.  We plan on doing that at another site (Farmington), which will become a DR site.  We are running EIGRP throughout the organization over an OPTEMAN netowrk and also sending routes to a managed MPLS network which uses BGP.  BGP redistributes into EIGRP and vice versa.  I've attached a pdf of the network.  The 3750 core at the corp hq is a temp core, hopefully upgrading to Nexus within a year or two.  This problem didn't exist until the 3750 was introduced and became the gateway for the site.  The OPTEMAN router was the gateway and was on the same VLAN as the MPLS router.
 
So, in detroit we have an Detroit-MPLS router, Detroit-3750, and Detroit-OPTEMAN.  What I'm seeing is that the routers I'm getting from the MPLS router make it to the 3750.  The 3750 advertises those routes to the Detroit-OPTEMAN router.  However, the OPTEMAN router doesn't advertise these routes any further..
 
In Farmington, it is currently set up like Detroit used to be set up.  There is a flat network and both routers are on the same VLAN, no L3 core switch.  Routes come in from the MPLS, get advertised to the Farmington-OPTEMAN router, distributes the routes out to all OPTEMAN connected routers, including Detroit.  However, Detroit is not passing that route to the 3750.
 
When we made the 3750 stack the core, we didn't change anything else, except for some IP changes. Why these routes aren't fully redistributing?
 
Detroit-3750 Stack
WS-C3750G-24TS-S   <-Stack master running c3750-ipservicesk9-mz.122-55.SE7.bin
WS-C3750X-12S-E  <-Running c3750e-universalk9-mz.122-55.SE7
show sdm prefer
The current template is "desktop routing" template.
[Code]...

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Cisco Switching/Routing :: EIGRP Default Route 3750

Jun 20, 2012

I have a 3750 at a branch running EIGRP connected to two routers that both have configured:
 
access-list 1 deny   0.0.0.0
access-list 1 permit any
access-list 2 permit 0.0.0.0
access-list 2 deny   any
 
router eigrp 1distribute-list 1 out FastEthernet0/0distribute-list 2 in FastEthernet0/0
 
Due to this recently applied config the switch become unreachable from the outside and cannot ping anything. Everything connected to it works fine. I was able to remote into it from a switch behind it and noticed that the 3750 has no default route in the routing table. I do see a default route in the eigrp topology table. How to make the switch learn a default route maintaining the existing configuration on the routers.

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Cisco LAN :: 3750 - Range Command / Session Hang

Oct 18, 2012

I've noticed that when using the range command to configure multiple interfaces on a 3750 the SSH session oftens hangs. It's seems the more interfaces in the range command the more often it hangs. I have a feeling it also spikes up the CPU. Doesn't seem to be related to a specific version of code.

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Cisco Switching/Routing :: 3750 SNMP Trap Send Every 30 Seconds

Dec 17, 2012

I have a snmp trap sent every 30 seconds from one of my cisco switches (a stack of 3750 to be precise): ccStatusMemberStatusChange. Do you know what it is and why it is sent continuously?

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Cisco Switching/Routing :: 3750 Redistributing A Static Route Into EIGRP

Feb 13, 2013

I'm attempting to redistribute a static route into EIGRP on a 3750 switch and pass it to an upstream router, sadly however this isn't working, or at least the route isn't being recieved on the upstream router. [code]

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Cisco Switching/Routing :: Set Up A Monitor Session With 3750 Stack

Aug 20, 2012

i have just set up a monitor session with a 3750 stack .Simple enough task you would think.But i only seem to be seeing broadcast packets !!Now there is definitely unicast traffic being used on the host i am monitoring.I have done the basic commands

-monitor session 1 dest int fas 5/0/24

-monitor session 1 src int fas 5/0/34

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Cisco Switching/Routing :: 3750 / EIGRP Router Won't Update Neighbor With New Network

Apr 18, 2012

I am working at a client site today on a routing issue.  I am currently working on an issue where a 3750 switch running EIGRP will not update its neighbor router when a network statement is added to the eigrp instance.The neighbor is a 3825 router.
 
Both the switch and the router have a common network which is 192.168.36.0/24.
Both the switch and the router are in a neighbor adjacency.
Both boxes have "no auto-summ" in the routing configuration instance.
 
I can run debugs on both routers (debug eigrp packets) and then I can watch queries and updates when I issue "auto-summ" or "no auto-summ".  Also I see a "graceful restart" for the peers when this is done.I had an expectation that when I added the network (this is just an arbitrary network for testing, which is 172.16.69.0/24).  I wanted to watch this network being sent in an update to the neighbor router.When I add the above mentioned network, there are no updates packets sent from the 3750 to the 3845.  I have not had success to this point trying to resolve.  I have followed the Cisco document "Troubleshooting EIGRP Flow Chart", but have exhausted all it has to offer and now it is at the point where it is telling me to contact TAC.

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Cisco Switching/Routing :: Does 3750 / 3560 Switch Support Eigrp Or Ospf

Feb 17, 2013

I believe the answer is yes, but incorperating more layer 3 features of our 3750's, I want to know if they fully support EIGRP or OSPF?
 
Also for a small business of 4 locations, each with a 10mbps fiber and a 1.5mbps mpls... wouldn't you say EIGRP would be easier?  Want to look at making the failover automatic if the 10mbps fiber goes down between a site, then the network fails over to 1.5mbps mpls. When the fiber returns in service then the network automatically preferr the fiber again. 
 
Currently we use static routes and if there is a provider outage we have to manually edit the config to flip flop the routes.

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Cisco Switching/Routing :: 3750 - Unable To Paste Script Into Terminal Session

Feb 28, 2012

I have 100+ 3750's that are running various IOS, some stacked and some not, and all seem to have the same problem.If I attempt to paste a configuration into the terminal session I get booted after about 10 to 15 lines.  This happens when using SSH and Telnet.  Telnet will go a little further before I'm booted.  After I'm booted it sometimes takes a minute before I can log back into the switch. Any issues pasting configs into a 3750 via a VTY session?

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Cisco Switching/Routing :: 3750 Switch - Eigrp Stub Static Redistributed Command Executable?

Feb 29, 2012

On 3750 switch with IOS c3750-ipbasek9-mz.122-55.SE4.bin  "eigrp stub static redistributed" command will be executable ?

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