Cisco Switching/Routing :: 3750 Switch Connected Computers Hang For Few Minutes

May 6, 2013

In my customer having 3750 switch and they have simply assign IP address for vlan and enable telnet in switch and other things are same as default switch.In this switch they have connected 8 cisco layer 2 switches(6 managed and 2 unmanged switch) and approximately 5 servers connected in this switch.In a particular interval,users accessing File server are connected to 3750 switch become hanged for few min.This happen for some particular interval.users accessing this server becomes entirely hanged for few min,then i have configured port monitor cmd and i have installed one wildshark tool to host connected directly to that switch.

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Cisco Switching/Routing :: Hang During Boot Of WS-C4948-S Switch

Apr 3, 2013

I encountered an issue while trying to boot Catalys WS-C4948-S switch. I power on the switch and I'm able to see the boot messages thourgh serial console cable. But it gets stuck at line "Image text-base: 0x1000000, data-base: ..... ". Also I can enter into rommon mode. I tried to use different kinds of IOS images, tried to boot from tftp but with no luck, the issue is the same.
There are no erros on the screen, it just gets stuck when it enters into IOS, so I don't see the IOS prompt.

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Cisco Switching/Routing :: VSS Switch Got Hang After Inserting 6708 Module?

Jan 11, 2012

We having a VSS switch (9 slot chasis) with ios "s72033_rp-ADVENTERPRISEK9_WAN-M), Version 12.2(33)SXI4", slot 7-9 are currently free. We wanted to install WS-X6708-10G-3C module on slot 7. Once we installed the module it didnt come, after waiting for 15-20min again we removed and inserted, but module didnt come up and we could see following logs on the console:
Jan 12 08:57:40.146: %ISSU-SW2_CFC2-3-ERP_AGENT_SEND_MSG: client/entity send failed; error code is timeout
*Jan 12 08:57:40.330: %ISSU-SW2_SPSTBY-3-ERP_AGENT_SEND_MSG: client/entity send failed; error code is timeout
Jan 12 08:57:40.146: %ISSU_ERROR-SW2_CFC2-3-START_NEGO_FAILED: ISSU NTI Client(2040): failed to start negotiation (ISSU_RC_CLIENT_ENTITY_DOES_NOT_EXIST_IN_PEER)


Afer some time VSS switch didnt response to console commands and all the users in access switches were not able to reach the gateway (VSS). Then the problem disappeared once we rebooted both the switches in VSS.why the VSS switch become non-responsive?

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Cisco Switching/Routing :: 3750 Method Of Forcing Non Connected Switch Port LED To Blink

Jan 9, 2012

Any method of forcing a non connected switch port LED to blink for a certain number of times regardless if there is anything connected.The purpose of this is we have remote 3750 switch stacks and quite often have to tell non technical staff to patch to a certain port. It would be much easier if we could say "Connect it to the empty port which just started blinking orange" as the port numbers are difficult for them to see in these locations.A similar feature is available in the ethtool package for linux which makes it really easy for identifying ports on servers. It would be great if a similar feature is available on Cisco switches.

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Cisco Switching/Routing :: Configure LACP In 3750 For Two Port Connected To Dell M6220 Server Switch?

Aug 1, 2012

We have Dell M6220 blade server that server is connected to cisco 3750 switch. I am trying to configure LACP in 3750 for two port which are connected to Dell M6220 server switch. The channel-group 2 mode  active commande is not taking then its showing the error protocol mismatch and if i run show int port-channel 2 command the port channel status is showing down. The Dell server switch is on simple mode. below i have attached the required details.

Switch#show int port-channel 2
Port-channel2 is down, line protocol is down (notconnect)
  Hardware is EtherChannel, address is 0000.0000.0000 (bia 0000.0000.0000)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set


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Cisco Switching/Routing :: 2960 - LAN Computers Always Disconnect Every 10 Minutes

Jan 7, 2013

i'm using 2960 cisco switch and every department has a switch same model, i have noticed that every 10 to 15 minutes my network is disconnected for atleast 10 seconds and all client conneted to the server was disconnected also.

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Cisco Switching/Routing :: 2960 / 3750 - Port Disables Every 10 Minutes

Aug 15, 2012

I am experiencing the same problem described in this post {URL}. I have seen this happen on different networks, with different equipment attached. It happens on both 2960 and 3750 switches. Basically the connection drops, and we see in the web interface "Port is Disabled". This appears to happen every 10 minutes.
On the CLI, the status shows as connected.
Port Name      Status       V lan       Duplex  Speed Type
Fa0/38             connected     1          a-full  a-100 10/100BaseTX
I have ran cable diagnostics while the drop out is occurring.
Interface Speed Local pair Pair length        Remote pair Pair status
--------- ----- ---------- ----------------- ----------- -------------------
Fa0/38    100M  Pair A     28   +/- 15 meters Pair B      Normal
During the outage, I see the duplex fluctuate between full and half. The outage occurs for approx 90 seconds. If I fix the duplex and speed at both ends, the outage reduces to around 30 seconds. If I apply spanning-tree port fast the outage reduces further to around 10 seconds. Before I change any configuration on the port, the logs show the interface going down
Aug 16 13:06:51.875: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/38, changed state to down
Aug 16 13:06:52.874: %LINK-3-UPDOWN: Interface FastEthernet0/38, changed state to down
However, once I apply the configuration nothing is logged. However we can still see the connection is disappearing for around 10 seconds. I suspect the issue wasn't resolved for the person reporting the problem in the link above, but because the outage is minimized, and not being logged it is going unnoticed.

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Cisco Switching/Routing :: WS-C2960S Switch Hangs After Couple Of Minutes It Restarts

Jun 12, 2013

After insertion of SFP module in  the Switch i have messages bellow and the switch hangs after couple of minutes it restarts


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Cisco Switching/Routing :: 3750 / 3800 - Configure Trunk Between Switch And Extreme Switch

Nov 2, 2011

i have an issue to connect a trunk between cisco switch and extreme switch i have many vlans that i want to cross via a link between cisco 3750 switch and a Extreme Alpine 3800 switch

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Cisco Switching/Routing :: 3750-X Stacking Switch By Switch

Nov 18, 2012

I have two 3750-X configured to be a stack and I am planning to re-rack these somewhere else.  What I would like to know is what are the effects of having the master switch itself lose power?  Does it immediately just make the member take over master (there should be no election since there are only 2 switches??) and there would be no loss of connectivity?

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Cisco Switching/Routing :: Two 3750 L3 Switches Connected Via Trunk

Jan 29, 2012

I have client who has two distant offices with 3750 L3 as core (do all vlan routing for local office) and multiple L2 access switches with multiple VLAN’s connected to it. First 3750 is hub also connected to internet, second 3750 is spoke and acting as a router on stick. We have eigrp configured on both side ISP provided client 100Mbps link as a trunk with two vlan; vlan10 for voice and vlan20 for data. We assigned two small subnets to these vlans and Hub addresses are and respectively. How to force voice over VLAN10 and data via vlan20, but still do some load balancing? How to setup default route on second (router on stick) switch?

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Share Files Between Computers That Connected Through Switch?

Nov 30, 2012

how can we share files between computers that connected through switch,also how we can apply password,and share between only some computers?

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WRT54GS Computers Connected To Switch Much Slower

Feb 15, 2012

Basically, my home network is comprised of a WRT54GS Router which the cable modem and my main computer are plugged into (as well as vonage, networked printer). That leaves one port open which is used to connect a Dlink DES-1105 10/100 switch. I am connecting it using a crossover cable, though that was not necessary.I just noticed that a computer connected to that switch gets MUCH less download speeds at, and it gets STUCK on the upload test (doesn't even start).I unplugged it and plugged it directly into the router for testing. I get 20-30 megs down (like I should), rather than 5-11 like the switch gave me (ONCE the switch gave me over 20, not sure why..)The upload test NEVER runs though. I've tried different computers as well. I tried setting the computer to "100 full duplex" manually and no luck.

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Cisco Switching/Routing :: 2 PE Routers Connected To Each Other Via 2960S And 3750 Switches

Mar 5, 2013

I have 2 PE routers connected to each other via 2960S and 3750 (non-metro) switches:

[PE1] -- [2960S] -- [3750] -- [2960S] -- [PE2]

I will be sending voice and data traffic between the two and my voice traffic will be marked DSCP EF & EXP 5.

Since the 2960's and 3750's can't match on the EXP bits, I am wondering if the "mls qos trust dscp" command still works. Is the 2960/3750 able to match on DSCP even though there's an MPLS header on top of the IP packet?

I'd like to avoid having to tag my VLAN traffic on the PE and rely on COS to achieve QoS in this case.

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D-Link DIR-615 :: Computers Connected To LAN Through Switch Could Not Access Internet

May 8, 2011

My Dlink DIR-615 had worked flawlessly for almost 7 months now.But since last week it started showing problems.All the computers connected to LAN thru the switch could not access the Internet but the Server( which is connected to the DIR-615 could connect to the internet.the above screenshot was captured thru a laptop running Win7 Ultimate connected to the DIR-615 thru WiFi-n.Even after repeated Reloads the same error cropped up in the browsers in the computers connected thru the switch.The computers connected to the switch could access the Internet after I restarted the router.

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Cisco Switching/Routing :: 3560 Switches Hang Off With Sub Interface

Jul 22, 2012

Was building a small network in Cisco Packet Tracer and ran in to an issue.  I have 4 routers running OSPF, and off one of the routers I have 5 3560 Multilayer switches.  The router that the switches hang off of, I have a sub-interface with dot1q encapsulation, set for vlan 10 and an IP Address.  The switches have interface vlan 10 configures, and have IPs in the same subnet.  From that router, I can ping/telnet to all the switches without issue.  My problem arises when I try and reach those switches from any other router.  OSPF is set to redistribute static and connected subnets.The routing table is populated correctly on all the routers.  When I ping and trace the packet, it looks like it makes it all the way to the respective switch, but the packet never makes it back.  I've played with the default route on the switches to no avail.  Am I trying to implement this incorrectly, or am I just missing something?

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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 Receiving CDP Packets From Switches Not Directly Connected

Jun 27, 2010

A specific switch port which happens to be part of a 2 switch 3750 Switch Stack is seeing multiple CDP packets from 3 extra switch port interfaces that are not directly connected. Noteworthy is that the far end devices have the correct CDP entries and I physically confirmed at least two of those connections that lead to the switch "upstream to the culprit switch". Tricky part is that its production so room for maneuvering is limited. At some point I disabled all Ports save for the real uplink and the problem momentarily disappeared. Re-enable the interfaces problem resurfaces. Is there an explanation, technique to eliminate the culprit with minimal disruption?

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Cisco Switching/Routing :: 3750 - Two Switches Connected With Single Mode Cable

Jun 4, 2012

I am troubleshooting a fiber connectivity issue.Now I have two switches, one is 3750, and another is small biz 300 series switch. Both switch has a single mode smf gbic. Now I have two swtiches face to face and connect with a single mode cable. Do you think if I would get a link light on? Both ports are no shutdown.

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Cisco Switching/Routing :: 4507-R Installed At Customer Site Which Hang Twice

Oct 26, 2011

We have Cisco 4507-R installed at customer site which got hang twice and became normal after getting booted.I have analyzed show tech-support for this switch after reboting but not found relevant logs for hang issue,

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Cisco Switching/Routing :: 2811 / Hang And Reboot Router Every 3-4 Hour?

Jan 1, 2012

I have Cisco 2811 secure router in my network.  Seven day before it has been hanging every 3-4 hour. i have updated "c2800nm-advsecurityk9-mz.124-17.bin" IOS in the router.  After that it giving some error and every 7-10 hour network has been delay in LAN as well as WAN and not pinging.

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Cisco Switching/Routing :: 2811 Router Hang Frequently And Restart?

Dec 25, 2011

i have facing problem in my Cisco Secure router 2811.  It hanging every 5 to 10 minutes and restart.  IOS of cisco router is 12.4 ipsecurity. I have attached the error log and configuration file of my router.  Kindly see the log and let me the problem in my router. 

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Cisco Switching/Routing :: Inter-VLan Routing On Catalyst 3750 Switch

Dec 17, 2011

I have been looking into this for a while and I can't seem to figure out why my 2nd vlan is not able to connect properly to the net.
My switch has 12 ports where my devices connects directly, they are all on Vlan 1 and they all work perfectly. on Port 12 I have a dlink router that is connected to a cable modem. the dlink router has an Ip address of
I created a second vlan (vlan2) and enabled dhcp relay on it. then I assigned port 9 on the switch to  (vlan2)my laptop which is connected to port 9 seems to get an ip address fine and able to ping only some devices on my network (vlan1) and is not able to go out to the internet.  I think it has to do with the routes. [code]

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Cisco Switching/Routing :: 3825 / Replacing Routing Function With 3750 Switch?

Jul 27, 2012

I have the task of replicating the router config on a 3825 router on a 3750 switch. Reason is we are taking out the router and replacing it with the switch to make use of the router for other functions.
Below is main part of the router config:
ip source-route
ip cef
multilink bundle-name authenticated
license udi pid CISCO3825 sn FCZxxxxxxx
vlan internal allocation policy ascending

The 3750 switch I have runs C3750E-UNIVERSALK9-M, Version 12.2(55)SE3 on a LAN BASE license.
The first thing I have done is to order for a license upgrade to IP BASE which would give the support for OSPF routing.I do not see much of an issue with the Interface configs, however, I am not too sure about replicating the routing config on the switch.
My question is can I run the commands as shown for the OSPF routing on the switch? If not, can I get suggestions on how best to set this up on the switch?

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Cisco Switching/Routing :: About Intervlan Routing On Catalyst 3750 Switch

Apr 16, 2012

I have been looking into this for a while and I can't seem to figure out why my 2nd vlan is not able to connect properly to the net. My switch has 12 ports where my devices connects directly, they are all on Vlan 1 and they all work perfectly. on Port 12 I have a dlink router that is connected to a cable modem. the dlink router has an Ip address of,I created a second vlan (vlan2) and enabled dhcp relay on it. then I assigned port 9 on the switch to  (vlan2),my laptop which is connected to port 9 seems to get an ip address fine and able to ping only some devices on my network (vlan1) and is not able to,go out to the internet.

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Cisco Switching/Routing :: Cannot Reach Gateway Through Routing Switch (3750)

Mar 11, 2012

I'm running into what seems a basic ip routing config problem with a Catalyst 3750 (IP Base) switch. I have several VLANS configured on the switch with IP routing enabled, and the switch is connected to the inside interace of a new ASA 5520 as follows:
ASA5520 IP (Default gateway): Gi1/0/1 is configured as a routed port, IP address VLAN is VLAN 100, IP address From the switch CLI, I can ping all VLAN addresses, as well as the ASA5520, and the client laptop I'm testing with from VLAN 100.
From the client laptop on VLAN 100, I can ping all switch interface and VLAN addresses (inter-VLAN routing is working), including, but I CANNOT ping the default gateway at
Here is the relevant configuration information on the 3750:
no aaa new-model
switch 1 provision ws-c3750x-24
system mtu routing 1500


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Cisco Switching/Routing :: 3750 - Port VLAN Setting Reverts Whenever Host Connected

Apr 17, 2013

One of the ports on the 3750 stack was configured for VLAN121. It was changed to VLAN40 and the configuration saved. Both VLANs exist in the switch configuration. As soon as a host was connected (in this case, a label printer) the port VLAN reverted back to VLAN121.

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Cisco Switching/Routing :: Configure QOS In 3750 Switch?

Nov 7, 2011

configure qos in Cisco 3750 switch.I have configured below template and applied on the vlan interface.But i am getting the hit on the access list but I am not able to get hit on the class map.

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Cisco Switching/Routing :: Switch 3750-X Vulnerability

Jul 19, 2012

I had a bad expirience with Switch 3750-X. Because of an auditing security processess, my customer ran a software called "Nessus" to do a scanning of vulnerability on the network. When this software is point to switch, the process of the switch will next to 100% and reset. The software only do a listening on the ports to see what ports are opened and the switch should not reset because this. Bellow is the log os switch on the moment of test; we note that the processess 'HTTP' rise moments before the switch reset. I disable the HTTP service on switch but the problem persist. The test was made only one machine connected to switch.

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Cisco Switching/Routing :: 3750 POE Switch Stacking?

Aug 12, 2012

We have three Cisco 3750 - 48port  POE -LAN switches and i am trying to see if there are any issues when we stack POE and Non-POE type of switches.Aslo looking for information on the advanatage and disadvantage the stacking can provide on a Cisco 3750 48port.

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Cisco Switching/Routing :: Setting MTU On A 3750 Switch?

Dec 12, 2010

The question is: Will a 3750 switch route Jumbo frame sizes (e.g. 9000 MTU)?
We know that we can change the System MTU to 9000, and someone on a previous thread said that we can change the Routing MTU to 9000 as well, although I couldn't figure out how to do that.  However, regardless of how we configure the System MTU and Routing MTU, I don't think we're able to adjust the MTU on L3 VLAN interfaces, so if we want to actually "route" between VLANs on the switch, we're limited to 1500 MTU.
Our situation is that we have a customer connecting to our 3750 switch, and this customer wants to use Jumbo frames.  The customer connects to our 3750 switch via their own VLAN, with their own L3 VLAN interface configured on the switch.  The customer will point their traffic towards the L3 VLAN interface, then we want to route them onto another VLAN, via a different L3 VLAN interface, before forwarding their traffic.  Because of the limitations noted above, specificially regarding the routing between these VLANs via L3 interfaces, I do not think we'll be able to support 9000 MTU frames on this 3750 switch.  I think the L3 VLAN interfaces will limit us to 1500 MTU, regardless of what we configured via the global System MTU and Routing MTU settings.

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Cisco Switching/Routing :: Remove QOS From 3750 Switch

Jun 8, 2007

How do you properly remove the QOS queues and configs from the switch.A was using auto qos which created a whole mess of qos configs on my running-config. I did "no mls qos" in conf term but that did not remove the queues.

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Cisco Switching/Routing :: 3750 / Add A New Switch In Stack?

Jun 21, 2012

i want to remove an access layer 3750 48 POE master switch and replace with a  new 3750 switch in the stack. i want to copy the same configuration to new switch since the old switch is having POE issue and I got replacement of the malfunctioned switch. we have VTP domain is configured in the network...

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