Cisco Switching/Routing :: 6500 - Randomly Devices Will Drop Offline And Then Come Back
Aug 28, 2012
I have a network that has a pair of 6500 switches on either end, running HSRP. In between each 6500 are two to three ruggedcom switches. They are connected to each other and the 6500's by trunk ports in a straight line. The 6500's see each other as CDP neighbors, and the 6500's can see the rugged- com as LLDP neighbors (ruggedcom only supports LLDP).
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The issue is that randomly devices on the ruggedcoms will drop offline and then come back. The problem is that the devices that drop offline are all in the same VLAN, so it appears like a virus -Â i.e. one device drops off, then multiple. Eventually the HSRP starts flapping between the two 6500s and this causes havoc on the network.I'm almost to the point of taking a laptop and plugging it into one of the ruggedcom's to see traffic, but the issue is that the ruggedcoms are outside in cabinets that laptops shouldnt be exposed to.
My workstation(10.0.0.250) directly connected to 6509_1 switch. 6509_1 is gateway with ip 10.0.0.5/22. Sometimes routing stop working, but after 3-5 minutes all back to normal.When issue occur i can't ssh to 6509_1, but i connect to second 6509_2 (10.0.0.6) and i can ssh to 6509_1 from it.Then form 6509_1 i try to ping my workstation Wireshark on my workstation show that packet arrive. My workstation reply on it, but switch not accept it.How it possible? As I say after sometime all go back to normal without any changes. [code]
I have a stack of 4 Cisco WS-C2960S-48FPS-L switches running c2960s-universalk9-mz.122-58.SE1 code. One of our network monitoring tools is indicating discards on a certain port on the switch. Upon further investigation I am seeing the Total output drops values change in a very odd manner.  The numbers seem to go from 573 to 1146 to 1719 then back down to 573 and it starts the same pattern over: [code]
The port utilization is quite low, the highest I've seen over the past 7 days is 3.5% with a polling period of every 30 seconds using Statseeker. Yet the discards are bouncing all over the place.  I've searched though the bugs for 12.2(58)SE1 and didn't see anything.
On a 6500 switch running ios 12.2, is there a way of clearing all config settings for a specified interface? I want to avoid going through and having to type "no blah blah etc" for each line.
I have an Cisco 6500 CS and there is a Cisco Unified Communication Manger Server connected directly to the Core Switch.I tried to change duplex and speed ( fix and auto ) for both sides, but the same problem.
Here is my Lab Setup: 2691 is BGP nei to R4 router and they are not directly connected. 2691 and R4 are in same AS 6500. 2691 Config---router ospf 1 network 3.3.3.3 0.0.0.0 area 0 . Its advertising its loop back IP to OSPF domain.  router bgp 6500 no synchronization bgp log-neighbor-changes neighbor 6.6.6.6 remote-as 6500 neighbor 6.6.6.6 update-source Loopback3 [code]...  R4 Router  router ospf 11 log-adjacency-changes network 6.6.6.6 0.0.0.0 area 0 [ code].....  We can see that 2691 and R4 are BGP neis and 2691 has 200.1.x.x routes in its route table. My question is why from 2691 router i am unable to ping any route learned by BGP from R4?  2691Router# ping 50.1.1.0 Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 50.1.1.0, timeout is 2 seconds:.....Success rate is 0 percent (0/5)2691Router#ping 200.1.2.0 [ code]...
My internet connection seems to drop offline randomely while surfing the net. It basically results in yahoo or google freezing for 20-60 seconds before unfreezing and running flawlessly again. I seen a previous post that requested the individual hit start, run, cmd, and enter tracert google.com.
Windows 7 Professional Service Pack 1 Intel® Core 2 Duo CPU E8400 @ 3.00GHz
I have a BEFCMU10 v1 that has been misbehaving recently. It will go off line losing contact with the router and the Internet. It will stay off line for 8 to 10 minutes and then comeback on its own. If I cycle the power it will come up pretty quickly. Here is a log of a recent episode without power interruption.; [URL] Is there a solution or is it time for a new modem?
I have a Cisco 8510msr that is connected back to back with a 7206vxr across a 155Meg connection.I receive lots of Output drops on the 7206vxr interface facing the atm switch. When I do the following command:-
kwdair9#sh atm int atm 1/0Interface ATM1/0:AAL enabled:Â AAL5 , Maximum VCs: 4096, Current VCCs: 27 Maximum Transmit Channels: 0Max. Datagram Size: 4528PLIM Type: SONET - 155000Kbps, TX clocking: LINECell-payload scrambling: ONsts-stream scrambling: ON797522 input, 881483 output, 203946630 IN fast, 223768062 OUT fast, 0 out dropVBR-NRT : 110288 Avail bw = 44712Â Â <====Â Â
I only have 44megConfig. is ACTIVEkwdair9# I only get 44Meg of the available 155Meg.There is no QOS on the router and the only commands I can find that vaguely see that refer to QOS are on the ATM switch:-
atm address 47.0091.8100.0000.0007.0d87.b201.0007.0d87.b201.00atm router pnnino aesa embedded-number left-justifiednode 1 level 56 lowest redistribute atm-static?why this is acting like a DS3 link and not a 155Meg link?
I have two site that has a copper wire ( 2 wire) connection between each router ( No Telco in between ). Now I want to use 1921 router with HWIC-4SHDSL-E card to connect these two site together. Can I use attach configuration to make the connection reference from the diagram ?
I have 2650XM router and 2620 Router Both routers have built in WIC T1 CSU/DSU cards  2620Router --  2620Router#sh int se0/0 Serial0/0 is down, line protocol is down  Hardware is PQUICC with Fractional T1 CSU/DSU  Description: DTE side  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,     reliability 255/255, txload 1/255, rxload 1/255  Encapsulation HDLC, loopback not set
[code]....  My question is that cisco website says there are two type of cable connections for this type of config --which are --T1 CSU/DSU ConfigurationSet one CSU/DSU to clock source internal, and the other CSU/DSU to clock source line. The linecode, framing, data-coding, and timeslots must be set the same on both CSU/DSUs.Four-Wire 56k CSU/DSU Configuration For my network connection which type of config i should use??Secondly i try to connect these ports by normal crossover cable it did not work.So for this type of connection i know i need T1 cross over cable-- which has RJ 48 connections at both sides.I check cable from ebay which is RJ45 RJ48 cross over -- will this cable work in my router to router connection.
I have 1 2611xm router and 1 2801 router. For my own lab purpose, i want to configure them back to back to support voice services. I don't know what configuration will be required at each end. in 2611xm, i have NM-2V and its also detecting the card, so i hope it will work ? also what commands i need to run on both ends .
Up until recently (4 months ago) my network was fine. However, all of a sudden the network began to drop randomly. Now, the network drops about every 30 mins. Its quite an inconvenience, especially as there are two laptops, a desktop and 2 games consoles running off of the network (not all at once though). I have a Belkin Wireless G Plus MIMO router.
Wireless clients drop off Netgear router - Running a Netgear router in home. Have one desktop PC, 2 printers, 1 Mac and 3 Windows laptop connected. The devices that connect wirelessly will drop of the router in a random way. One printer, an HP all in one, will no longer function and I have to pull the plug to de-energize and restart it. My wireless network is a mess. I have called Netgear and for the first two months they had me change channels and adjust other settings which seemed to work at first but then these symptoms all came back.
i have a nexus 5k with a l3 card i'm not able to bring online  NX-OS is:5.0(3)N2 (1) L3 card is:L55D160L3  i inserted L3 module several time with the same resul...if i perform a show module i see the card offline. At the boot switch show an error message:  L3 module is down due to a BTCM down..
I am setting up a new environment with 2 5548's and some 2248TP-1GE Fex's and Im running into an issue. I have the peer link and peer-keepalive link that appear to be good. When I configure the fex and vpc for the fex manually on each switch without pre-provisioning the slot the fex comes online and everything appears to be good. I can see all the ineterfaces when doing a sh int br and the sh fex detail shows all good. When I do the exact same thing but pre-provision the slot the fex stays in an offline state. Ive tried disabling the port(s) connected to the fex while configuring everything then enabling them but same thing. [code]
I have a server with 4 ethernet ports, 1G, they are bonded together, two of them was pluged into cat6500 module WS-X6724-TX. now we have moved the two ports to the replace module WS-X6748-GE-TX. Â I have checked server side, the bond configuration are same no changed. what is possible reason replace module will cause link offline? why "sh run all" give the port is shutdown?
I've had my WRT54GL for a couple of months now, and it keeps wiping my saved settings and reverting back to the default. It works fine with all devices for a week or so after the initial set-up, then will only work on the system that is wired.
I purchased this router a few months ago(wrt54g2 v1.0) when I moved into st louis missouri. My ISP is charter communications. I am using windows 7 64 bit.I had no problems with this router with wired connections, however my wireless devices would drop repeatedly. I updated the firmware to the latest linksys version, but still same issue.After much research online and trying everything I could through linksys, I found a page that someone with the same problem said it could be solved by upgrading to dd-wrt freeware firmware. After much trials and problems, I finally got it installed. However I did not like dd-wrt because it would not allow FTP access no matter what i tried, and would lead to dropouts of wired connetions even though it did fix the wireless.I then decided to revert back to the previous firmware - this is where i think i messed up..I downloaded tftp and a firmware called vxworkskiller, this was supposed to be able to break the dd-wrt firmware which it did, and removed it. I continued to follow the instructions provied to me and was able to then install the linksys firmware but I accidentally upgraded the firmware for the router WRT54GS with the firmware version 7.50.2. This is now dropping both wired and wireless connections VERY frequently. My roomate is not happy as we have to power cycle the modem, router and pc's every couple of hours and sometimes that doesn't even work.I am unable to flash firmware of any version or type anymore, every upgrade fails weither I use the linksys gui, or tftp or any previously working firmware. All fail.
When you use the command switchport trunk allowed vlan add [vlan-id]There should be no drop in service to the existing VLANs, correct? I am trunking from a 7K to a 2960S via 2G PoCh.
We are currently experiencing random multicast data dropouts on ports that are connected to a 3750X in VLAN ports. A test PC was connected to a routed port and we do not have any dropouts of the multicast data.We also took a 2960G and plugged it into VLAN ports on the 3750X. Any test PC that is on the 2960G does not lose traffic. The traffic only drops on PCs that are connected to a port on the 3750X that is in a VLAN. The data drops are random and last approximatly 55-59 seconds before we start receiving multicast traffic again.  I do not see any input/output errors on the interfacessh platform port-asic stat drop also show no drops  CPU runs at about 50% on the 3750X  Below is the configuration of the 3750X Building configuration... Current configuration : 8454!!version 12.2no service padservice timestamps debug datetime msecservice timestamps log datetime msecservice password-
I am running (cat4500-ENTSERVICES-M), Version 12.2(53)SG2 on the switch. I have a scenario where I have 3 end user equipments connected to a Cisco 4948 L3 switch. At the switch end port 1/46, 1/47, 1/48 are the terminating points for these 3 devices . I have added these three ports to VLAN140 (switch port access vlan140 on the gig interfaces).
The device connected to 1/46 is the one I'm testing some signalling features on. My requirement is to have intermittent packet drop on this interface so that my signalling associations would go down now and then. I'm trying to simulate a real-time network congestion/latency/packet drop in a simple manner.
I do not want to shut/no shut the 1/46 intf to cause this. Some way to achieve intermittent packet drop on this gig1/46 intf ?
We are seeing output drops on a C3560 switchport, this port does not have QoS enabled -- application does not need special qos treatment, as long as packets are not droppd, so I suppose all traffic will share the same queue? then how should I read the output of "show platform port-asic stats drop" which indicates that it is queue 3 weight 2 drop? I am wondering what is the best way to fix this? enable mls QoS and increase queue 3 bandwidth share on this interface or just increase the output queue depth? Â switch#sh mls qos interface gi0/1 GigabitEthernet0/1 QoS is disabled. When QoS is enabled, following settings will be applied trust state: not trusted
Because of licensing we want to keep some particular devices unmanaged via Inventory => Manage/Unmanage devices.But after some minutes all unmanaged set devices get back to managed. Its reproduceable many times.
I started having connectivity issues between my core 4506E (Sup7E) and Cisco 2960S. There were input and CRC errors on Te int (SFP 10Gb - LRM) on 2960S, which cause the interface to reset and drop connections. While troubleshooting this issue, I have replaced patch cords and also had the tech checking the fiber. He said that there was some residue on one of the connectors, so the light levels fluctuated in 1300nm, but worked fine in 850. Well LRMs are using 1300, so he re-polished the tips, which worked to stabilize the light levels. After all that, I was still receiving the input/CRC errors, but the connection was NOT dropping. As my last resort I swapped the SFPs between the core and 2960, thinking I should start having issues on the core end. Well, here's what happened: I stopped receiving input/CRC errors on 2960 (also no errors on the core), but 2960s started generating Rx power high alarms: [code]
I have users connected to a 2960-S running 12.2(53r)SE complaining of slow network, specifically Internet performance while the upstream 2960 on the same vlan has no such issues, so I don't suspect link congestion on the face of things.I'm planning on upgrading the code, but wanted to see what could be checked first. I'm seeing some drops but could use some tips on how to proceed from here as to what might be the issue. CPU is under 10% whenever I check it.
In my cisco 3845 router I can see output packet drop in some of the interfaces.I suspect that router is processing packet beyond its mix throughput limit. Moreover when i run show int fax/y switching command I can see packet drop by RP process.
I put a QoS in a WS-C3560CG-8TC-S version 12.2(55)EX2. in our lab file upload or download speed much reduced and drop the packets with QoS everyting is fine without QoS  Here is the config: My question is why I speed reduced a lot and packets to be dropped with QoS.everything is fine WITHOUT QoS.
class-map match-any VoIP description Voice IP Phone RTPmatch access-group 157 class-map match-any WEB description Internal Web, SSL Web, DNS query, Pinnaclematch access-group 153 ! policy-map QOSMARK class VoIP set dscp ef  class WEB set dscp cs3
I've got a 1760 router which uses port forwarding (25, 80 and 443) for my internal network services. If, let's say, I try to open a FTP connection on the router, of course the connection will be refused. Is there a way to make the router DROP the packets instead of rejecting them? My Linux iptables configurations drop packets who fail the firewall test, so I would like the router to perform that behavior.Commands for port forwarding:ip nat inside source static tcp 10.10.0.1 80 int f0/0 80 (these work fine)
