Cisco Switching/Routing :: 3750X Switches Dropping Packets On Uplink Interface?

May 9, 2013

We have a remote site that is using 3750X switches as layer 2 switches back to our home site.  The uplink port is showing dropped packets but the utilization on the link is never about 10%.  We have a 100Mb circuit to this site.  Our speed tests and iperf tests are not showing any issues that we can see.  However the port is still droping packets.  It is not dropping at a high rate but they are dropping.          
switch#sh platform port-asic stats drop gi1/1/4
  Interface Gi1/1/4 TxQueue Drop Statistics    Queue 0      Weight 0 Frames 0      Weight 1 Frames 0      Weight 2 Frames 0    Queue 1      Weight 0 Frames 52876      Weight 1 Frames 2      Weight 2 Frames 0    Queue 2      Weight 0 Frames 0      Weight 1 Frames 0      Weight 2 Frames 0    Queue 3      Weight 0 Frames 0      Weight 1 Frames 0      Weight 2 Frames 1330874    Queue 4      Weight 0 Frames 0      Weight 1 Frames 0      Weight 2 Frames 0    Queue 5      Weight 0 Frames 0      Weight 1 Frames 0      Weight 2 Frames 0    Queue 6      Weight 0 Frames 0      Weight 1 Frames 0      Weight 2 Frames 0    Queue 7      Weight 0 Frames 0      Weight 1 Frames 0      Weight 2 Frames 0switch#
Is there a way to capture these dropped packets to see what they are?  We do have VOIP phones at the site and are using Qos.

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Cisco Switching/Routing :: Catalyst 3750x 24 PS POE With C3KX-NM-10G Uplink Modules?

Sep 5, 2012

our network is spread over  15 floors and each floor we have 5-6 switches. we are planning to purchase cat3750-x 24 ps poe with C3KX-NM-10G  network modules. Each floor has two up links  to the core  switch  with  single mode fiber and other being the multimode.Suppose if we are purchasing 75 switches  do we have to  purchase 75 C3KX-NM-10 G  modules.? or  can we limit our purchase with 15 C3KX-NM-10G   sothat two uplinks from each floor can be made?  since network modules are optional cost factor is invovled. Or any issue with stacking ? the SFPs will be LR  and LRM MODULES.looking for an answer ? whether the new usb type console cable comes bundled with  cat350x or shall we have to order separately?

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Cisco Switching/Routing :: 3750x 12.2(58)SE2 IPBASE 10gb Uplink Ports Not Being Displayed

May 28, 2012

we have just purchased a few 3750x's that we intend to add to our 3750g stacks.  We've purchased the 10gb uplink modules, C3kx-nm-10gt, but when they are installed they are not appearing in the switches web gui nor can you configure them correctly.  If we upgrade a 3750x to 15.0.1 they seem to work fine.  All of our current 3750g's are running 12.2(58)SE2 IPBASE so we don't really want to have to upgrade them all to 15.0.1
Are we missing something or do the 10gb modules only work properly with ios 15.0.1?

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Cisco Switching/Routing :: 3750x 24s Not Forwarding Packets

Mar 1, 2013

We have a 3750x 24s acting as a root switch for about 10 other 3750x's. Everything else seems fine, but the device stopped forwarding packets to the applied static route. [code]

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Cisco Switching/Routing :: 3750X Netflow Packets Are Not Being Exported To Server After Update

Feb 5, 2012

Basically I have netflow which i'm trying to use to export to a netflow collector. I'm pretty sure that the 3750-X does support netflow. I've recently updated IOS on the 3750-X to support flexi netflow.For some reason the netflow packets are not being exported to the server. I'm using Opmanager which should present the netflow stats in the form of a graph. I'm using a universal IOS image. (C3750E-UNIVERSALK9-M), Version 12.2(58)SE2 3750-X WS-C3750X-24T-S

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Cisco Switching/Routing :: Why C2960 Is Dropping Packets

Dec 26, 2012

We have a customer who uses about 20 x c2960's switches for access layer and 2 x c3560e for distribution layer. C2960's uses C2960-LANLITEK9-M , Version 12.2(58)SE1. Everything was working fine. Now we got information, that sometimes there are problems with connectivity. Customer tries to reach internet.
SW11#sh int fa0/18       
FastEthernet0/18 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is e8ba.806a.4412 (bia e8ba.806a.4412)


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Cisco Switching/Routing :: 3750 Stackable Switches Uplink

Nov 14, 2011

If I have two stackable switches one that connects to the 6509 core switch and the other switch does not, do I have to uplink the switch to the other switch so that switch has route to the core switch or because the switches are daisy chain there is not need to cable one switch to to the other switch connected to core switch?

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Cisco Switching/Routing :: 3750 - Fiber Uplink Between Switches

Nov 3, 2011

I have three switches:
primary - Cisco Catalyst 3750G-24TS-24
and two SG300-28
I need to apply uplinks as follows:
3750G-24TS-24 SFP (1) -> SG300-28 (first) mini-GBIC (1)3750G-24TS-24 SFP (2) -> SG300-28 (second) mini-GBIC (1)SG300-28 (first) mini-GBIC (2) -> SG300-28 (second) mini-GBIC (2) 
I would like to know, What type of mini-GBIC and SFP and cable I should use for SX Multimode?What max speed rate I will get?  

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Cisco Switching/Routing :: 3750v2 DHCP Snooping Not Working Dropping Packets

Jan 9, 2013

I recently installed DHCP snooping on a 3750v2 switch (Version 12.2(55)SE4) and configured the uplink(Po2) as a trusted port. The problem is that clients cannot receive an IP address. When I disable DHCP snooping it is working properly. DHCP snooping is configured correctly but I don't have an idea how to resolve it. [code]I tested the solution on the same kind of hardware switch and firmware and it worked out fine. What is causing the clients not to receive an IP address from the DHCP server?

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Cisco Switches :: SG300 Is Dropping Packets?

Apr 10, 2012

We have a customer who we sent to Cisco to replace some aging Dell switches. They purchased 5 SG300-52’s for 2 different networks. Their production LAN has 2 “live” switches and 1 spare. The 2nd, a development LAN has 1 switch and 1 spare. Their primary production SG300-52 has GE1-8 VLAN’d off as VLAN2 for public IPs. The untrusted (WAN) interfaces of 2 x ASA-5510’s, 1 x ASA-5505, and 2 x RV082 v2’s are connected to GE2-6. GE1 is the uplink to the co-location center’s Cisco switches. GE7 & 8 are spare ports. Each SG and device port is hard coded for 100/Full.
One of the ASA-5510’s and the ASA-5505 maintain a site-to-site VPN (the development LAN used to be in a different facility hence the VPN). Recently the developers have stated the performance is horrible. I noticed ping traffic loss from PCs on the dev side to servers on the production side in the order of 20-30%. I assumed it was a VPN issue so I opened a ticket with Enterprise TAC (all the ASAs and the SGs have either SmartNet or extended support contracts). TAC determined the problem happened even if you ping from inside the ASA to the untrusted side of the other ASA thus eliminating the VPN as the culprit.
The 2nd ASA-5510 has the AIP module and was not even live until this weekend. Turning it up and giving it a basic config returned the same results. #ping x.x.x.x repeat 100 will drop 20-40 packets. I have no security enabled on the SGs and even tried using the spare SG300-52 this weekend in place of their primary with the same result. I’m to the point of returning one of the Dell switches to production, but this cannot be a good sign. I’m also a bit frustrated that I’ve yet to figure out how to get Cisco Enterprise to speak with Cisco Small Business on this. The customer has over $10k invested in Cisco equipment and Cisco isn’t jumping in to figure this out.
The latest rep wants a packet capture from the SG300’s VLAN2 but there are no PCs there to do this with and the manual doesn’t even talk about doing this. How we can do this as well as get the 2 divisions working together to fix this? BTW, the RV082’s exhibit the SAME exact problem. I can ping from ANY device on VLAN2 to any other device and drop packets. Copying a simple 1MB file over the VPN can take minutes where it should take 1 second. I can reproduce this for 24/7.

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Cisco Switching/Routing :: 3750x Binding Between A Switch Interface And DHCP

Nov 8, 2011

I am looking for a way to bind between a switch interface (cat 3750X) and a DHCP server reply.The switch can operate as the DHCP server .a PC connected to interface Gi 1/0/1 will lways get IP address because it is connected to interface Gi 1/0/1, a PC connected to interface Gi 1/0/5 will lways get IP address because it is connected to interface Gi 1/0/5 and so on... (no matter the source MAC address who sends the DHCP request).

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Cisco Switching/Routing :: 3750x - Command Cts Dot1x When Applied To An Up-link Interface

May 7, 2012

we're having an issue with the command "cts dot1x" when applied to an uplink interface.  It basically kils the connection with this command is applied.  Once you remove it, everything is back to normal, the platform is a cisco 3750x.

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Cisco Switching/Routing :: ICMP High Response Time To SVI Interface 3750X

Mar 13, 2011

I am in the process of installing a 3750x (IOS 12.2 (53r) SE2 IP Base) Cisco Catalyst switch in a new network of just 2 PC's (2 hosts, OS windows7 64Bits). I have enabled SVI interfaces with the both hosts installed in 2 different network segments.  We then start connectivity test.  The response time for the PING command between both hosts remain below 1 millisecond, whereas the response time between the hosts and their correspondent SVI interface is variable, and at all time is higher than 1 millisecond, sometimes it reaches 17 milliseconds. (Note that the switch CPU usage is only 8% at the time of testing)  We have performed this same connectivity test changing the 3750x switches  and in two different locations obtaining the same results. 

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Cisco Switching/Routing :: 3750x How Does A Switch Choose Its Default Source Interface

Oct 31, 2012

i have a stack of 3750x, with minimal configuration. there are two vlans, and two vlan interfaces with IP addresses. when i ping out from this switch to another host, it picks vlan1's ip address as the source automatically. i tested this by doing two pings with extended options using each vlan's interface as the source, and got different results. how the switch decided to use the first vlan's ip address as a source.

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Cisco Switching/Routing :: C6500 Packets Don't Get Hardware Switches

Oct 23, 2011

My C6500 is having relatively high CPU (no spikes, but constantly)
I'm under the impression that cef is causing this problem because alot of packets are being processed or send to/from the CPU. [code]

I did a netdr and I can see that the majority of packets going to the CPU are packets for which I have an entry in the CEF table.What can be a reason why those packets don't get hardware switches?I'm running Version 12.2(33)SXH5 - Sup720-10G.

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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 :: 3750x Implementing Macsec Between Two Switches

Aug 19, 2012

Can I implement MACsec betwen two Cisoc 3750X using the  C3KX-NM-1G? 3750x (C3KX-NM-1G) -------------------MMF------------------(C3KX-NM-1G) 3750x.

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Cisco Switching/Routing :: ASA And 3750x Switches - How To Get VLans Working

Jan 25, 2012

How to get vlans working properly between sub-interfaces on a ASA and a trunk port on a switch.There seems to be issue with the VLAN's being assigned to the correct VLAN and this information being properly sent to the ASA over the trunk.
We seem to be unable to ping most of the interfaces except for one on the switch. Sometimes if we are lucky we are able to ping a host on a different vlan that is on the switch. This seems sparadic at best.
Logs on the ASA show traffic does not seem to be assigned properly to the correct sub interface. We have access rules on the ASA disallowing traffic not part of the same vlan. For example you will see networkA blocked on networkB when it really should be directed through networkA's sub interface.
Any example commands for the ASA and Switch for at least the basic requirements to enable all the VLAN's to communicate properly with the ASA?

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Cisco Switching/Routing :: 3750X Setting Up Power Stacking Switches

Dec 27, 2012

I'm trying to get some clarity on power stacking 3750X switches. I have a new stack of 6 switches. I know I can only have 4 in a power stack and all 6 in the data stack with a max of 8. I'm trying to find the proper way to connect the power stack cables for the 4 switch power stack.

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Cisco Switching/Routing :: Possible To Do LACP Using 2 X 10GB Between 3750X / 2960S Switches

Sep 4, 2012

I need to know if is possible to do a LACP using  2 x 10GB between 3750X and 2960S (WS-C2960S-48LPD-L) switches.

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Cisco Switching/Routing :: Difference Between IP Base And Universal For 3750X Switches?

Apr 9, 2013

What is the difference between IP Base and Universal for 3750X switches?

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Cisco Switching/Routing :: 3750X / IP Base And IP Services Stackable Switches?

Aug 16, 2012

I'm building a wired closet to aggregate user's connections, Im planning to have 5x 3750X stacked switches and there is a need to run EIGRP, I'm thinking to order one switch with IP service image while the rest will run IP base image, is it workable scenario and what are the drawbacks of such combination of images ?  

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Cisco Switching/Routing :: 3750x Stacked Switches With Latest Firmware

Feb 25, 2013

I have two 3750x stacked switches , both with the latest firmware on them. I enter the configuration onto one switch and it obviously copies over onto the other switch. Although in the configuration I have both a console username and password and an enable password, when I try to log onto the initial switch that I entered the configuration on, I am prompted for a username and password, which works fine, but when I try to enter enable mode i get an error stating that no password has been set. However when logging onto the other switch I am not prompted for a username or password but when I try to enter enable mode I am prompted for a password and can access it with no problems.

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Cisco Switching/Routing :: Stacking 24 And 48 Port 3750X Switches Not Working?

Dec 11, 2012

We purchased a number of 3750X 48 and 24 port switches for the College Campus. Am finally getting around to getting them inserted on the network. Working with a WS-3750X-48PF-S and a WS-3750X-24P-L. Have them stacked with the 10Gb uplink on the 48 port switch. Have not been having fun.In the boot sequence, the switches recognize they are stacked, but as soon as they finish boot, I get the message on the 48 port switch: “Stack Port 1 Switch 1 has changed to state down.” Then “Stack Port 2 Switch1 has changed to state down.” Am noticing that I have a message preceding that: “Major version mismatch with stack neighbor.”The 48 port is running c3750e-universalk9-mz.150-1.SE3, HBOOT 12.2(53r)SE2.The 24 port is running c3750e-unversalk9-mz.122-55.SE3, HBOOT 12.2(53r)SE2Most of our 3750X and older switches are running 122-55 or 122.58 code. IP base or Universal. There is speculation that the problem is the 24 Port is Lan base, as the part number might indicate. (WS-C3750X-24-P-L.... I think that is the part number) and the 48 is IP base. Both switches are Universal, and my understanding is that they don't care about LAN or IP Base until you enable a function that falls in the IP Base domain. Then I have to call Cisco Licensing.For these switches, LAN Base is fine, based on the boot message, I feel the real problem is 122-55 versus 150-1 in the stack. So.. the question is: Do I downgrade the 48 port to match what we have in our environment, and what is on the 24 port switch. Or... Upgrade the 24 port switch to match the 48 port switch and have an installation that is not consistent with our environment? I do have two more edge closets to install with this purchase of 3750X 48 port switches.

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Cisco Switching/Routing :: 3750X - 48PS Switches Power Stacking

Mar 28, 2012

In my office we bought 7 cisco 3750X - 48PS switches. We configured Data Stacking between those switches. We also want to configure Power Stacking between those 7 devices.
I found in the Data Sheet that we can only configure 4 devices in power stacking at a time. If it is like that how to configure the rest of 3 devices. Need configuring power stacking between those devices in a better way..

power stack cable part no we have is

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Cisco Switching/Routing :: 3750x / Stackpower Switches Show In Standalone Mode?

May 29, 2013

I have a stack of 8 3750x switches connected via Stackwise.  In addition, I have these switches configured as two Powerstacks. When I look at the Powerstacks, they are showing as being in power-sharing mode.  When I look at the individual switches, they show as standalone.   Right now, I have 1 switch in each powerstack that has two power supplies, and then the other three have a single power supply. Below is the output for "Show stack-power detail" as well as the Powerstack configurations.
Power Stack           Stack   Stack    Total   Rsvd    Alloc   Unused  Num  NumName                  Mode    Topolgy  Pwr(W)  Pwr(W)  Pwr(W)  Pwr(W)  SW   PS--------------------  ------  -------  ------  ------  ------  ------  ---  ---Powerstack_1          SP-PS   Ring     2145    45      570     1530    3    3Powerstack_2          SP-PS   Ring     2860    60      760     2040    4    4Powerstack_1-1        SP-PS   Stndaln  1430    520     190     720     1    2
Power stack name: Powerstack_1    Stack mode: Power sharing    Stack topology: Ring    Switch 4:        Power budget: 700        Power allocated: 190        Low port priority value: 20        High port


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Cisco Switching/Routing :: 3750X Building IP Base And Services Stackable Switches

Jul 30, 2011

I'm building a wired closet to aggregate user's connections, Im planning to have 5x 3750X stacked switches and there is a need to run EIGRP, I'm thinking to order one switch with IP service image while the rest will run IP base image, is it workable scenario and what are the drawbacks of such combination of images ?

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Cisco Switching/Routing :: 3750x Switches / 32 Loop Back Responding As A Broadcast?

Jun 7, 2012

I have a bunch of 3750x switches that each have a 10 gig routed link back to a central 4507 (loopback = carved up a /24 (of course, the /24 doesn't really exist except in our address tracking spreadsheet) into a bunch of /30's for routed WAN links and /32's for loopback addresses.We started on the low end for /30 subnets (ie,, etc.).We started at the high end for the /32 loopbacks (ie,, etc.)
Well, when I try pinging from the access layer 3750x switches, the 3750x seems to be treating it as a broadcast ping where it lists each member that responds instead of the regular !!!!! response (this makes think something is odd with the 3750x).  Of course, only one member responds (the core).  But even the core seems to respond with the other end of the /30 instead of the actual /32 loopback (which makes me think something is odd in the core).  I could have sworn that I've setup similar topologies without problems (ie, using,, etc as loopbacks) and as long as the mask is a /32, it should work.Also, I can ping/ssh to that loopback if my laptop is on a directly connected subnet.  But I can't do it from any of the 3750x switches (which are also directly connected).I've double checked for overlapping subnets, but nope.  I don't see any.  Routing looks fine.  The actual /32 is being propagated everywhere properly.

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Cisco Switching/Routing :: What Are Options Available To Add Cat3560 G Switch To Stack Of 3750x Switches

Sep 8, 2012

What are the options avilable to add a cat3560 g switch  to a stack of 3750x switches.?is there a connector avilable ?or is it possible to trunk via fiber ? cat 3560 has 4 sfps and 224 10/100/1000 ports with poe. cat 3750 stack has a 10 gb up link . What are the possible options?

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Cisco Switching/Routing :: SGE2010 Switches Stack Dropping Ports

Oct 12, 2012

Our environment consits of 4 cisco SGE2010 switches (stacked). I have implemented STP BPDUGUARD and Portfast on all client ports (suspected a loop). And our uplink to the Server DMZ recieves almost all of it's BPDU packets back(is that normal?) The issues lies where we have random ports dropping out - across all stacks for seconds at a time. We get errors/warning such as,Pinging between the DMZ network appears to be fine. Pinging from the client/switch network show packets being dropped quite frequently.All devices are on VLAN1 (I've have researched this and this could be the cause of the issue)

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Cisco Firewall :: ASA5520 Routing Packets To Wrong Interface?

Apr 17, 2012

We have an ASA5520 running ver 7.0(8), nat-control is disabled. On the "outside" interface we have a closed network which is publicly addressed i.e. no access to Internet. We also have two Vlan interfaces on a trunk connection i.e. "inside" interface (Vlan7) and "dmz" interface (Vlan802). Traffic from the "outside" to "inside" is statically NAT'd such that the public IP is translated to a private IP when accessing the "inside" interface. However, our OSS servers on the "dmz" interface need to be able to receive packets from the public IP addresses on the "outside" . All is okay with the outside to inside traffic and traffic initiated from the OSS servers on the "dmz" to the outside works okay (snmp gets etc) i.e. the servers receive reply packets from the public addresses of the outside devices.
However, traffic that originates on the "outside" interface (snmp traps etc) which is destined for the "dmz" is actually being routed to the "inside" interface and therefore the public source address is being NAT'd by the static NAT command. The access-list "in_on_outside" has relevant entries to allow connectivity from outside to dmz, we have tried a static nat command (outside, dmz) to maintain the public addressing but this made no difference and also a nat exempt. With ########nat-control disabled - do I still need a translation or NAT exempt for the "outside" <> "dmz" traffic flow, if so how should this look ?

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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 Switching/Routing :: Why Nexus 2k Has 8 Uplink Ports

Dec 9, 2012

Why the nexus 2k has 8 uplink ports ?
the nexus 7k or 5k can be devided into 4 virtual devices  ( using vdc)and making 8 uplink ports in the 2k will allow us to use the extender for all the 4 vdc's with 2 uplinks ( for redundancy ) from each vdc   

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