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. 10.14.16.1/24. 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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Apr 4, 2013
I am using cisco packet tracer to configure the hsrp on 3560 (c3560-advipservicesk9-mz.122-37.SE1.bin) but the standby ip Command is not available on the interface the problem in that IOS or in config
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Aug 20, 2012
I am trying to configure 802.1x wired on a 3560 switch and don't see the required commands under the interface. I am running c3560-ipbasek9-mz.122-55.SE6.bin. I was thinking it might not be available on the ipbase image, but I do have the commands on a 3750g running the ipbase image, so I'm not sure about that.
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Nov 1, 2011
I've set up my 3560 to do routing. Now, I'm looking for a way to apply acl restrictions to the vlan interface ip address itself.
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Apr 9, 2012
I am setting up a link between buildings that uses wireless links. I'm using Layer 3 routed ports on 2 3560 switches to handle the routing between sites. Normally I would just put these in a /30 and then the switches handle the rest. However, the wireless access points have a web interface for managing them that I want to be able to access, but it's only available on the single NIC that also carries traffic. What would be the best way of making this work? Should I make the link a /29 and give the access points an IP in the same range? If this is the case what do I use for the default gateway for the access points?
I have included a diagram to try to explain the issue clearer. The IP addresses in black are what I would do if this were a standard cable (and indeed this will work, but I wont be able to access the admin interface of the wireless AP) and the red ip addresses are the alternative if I use a /29 (but as I said, I'm not sure what to use for the default gateways).
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Dec 6, 2011
Is it possible to have ether-channel across 2 switches? As an example, having a server with 2 ports connect, 1 port to Switch-A and the other to Switch-B and then use those two links on the sepatate switches but to the same server to form an Etherchannel.
The Switch-A and Switch-B are 3560 series
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Nov 6, 2011
i have an 2921 connected to an Catalyst 3560. My router interface shows quite a lot of input queue drops. Load is not too much max 5/255.
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Sep 5, 2012
whether VSS technology support on 3560 switches.I'm planning to intergrate new Cisco 2x6509 with VSS and all the access swtiches 3560's uplink to core 6509..if not support, what will be the solution or any bug fixing or new IOS releasing
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Sep 9, 2012
In cisco documentation for the 3560 it is mentioned that blocking appletalk will not work .It shows up in command line but it is not working due to hardware limitation.Is there any other way to block appletalk on 3560 swiitches.
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Apr 24, 2012
I have a question about RSPAN, is this feature only supported on 6500 and 4500 switchs?
we have 2 3560 switches and want to use RSPAN to monitor different source ports.I checked thorugh the cisco feature navigator and the IOS we have on 3560 has the RSPAN fature listed in them.
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Jul 16, 2012
OSPF normally only comes with IPservices image and not IP Base image. The 3560-C series data sheet says that it only suport IP Base image, yet it mentions that support for OSPF in included. Are there any restictions in the OSPF support?.
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Sep 3, 2012
I have a 5K with 5 downstream 3560's. I now have a new 5k that I would like to add to the existing 5K as a HA peer. What is the best way to accomplish this with the least amount of downtime for the downstream switches.On the 3560's, i plan setting up port-channels once HA is setup on the 5k's.
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Sep 21, 2012
We have 7 3560's in 7 different locations connected to our providor for wan access. Our provider has given us a copper cable at each point and we have connected it directly to our 3560 switch at each location. Each port is configured the same way at each location. Each switch is running eigrp.All of the switch ports on each switch are configured as a trunk and vlan 299 had the ip address for the eigrp connection: [code] This setup is working as each switch see's all of the other switches as an eigrp neighbor. We have also made sure that the switch at our head office has spanning tree priority for vlan 299.
So the problem is, if there is a change in the topology at one of the locations it usually causes one or more of the other connections to go down for some reason. We just cannot pinpoint what is causing this change. There are no log's or anything other than an eigrp hold time expired message.?
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Feb 19, 2013
We have a couple of Cisco switches and connected a (Windows 7) laptop to one of them and it gets its IP address from a DHCP server.I can now ping the IP from all of the switches, no problem, also not when I log on to the core switch in the same VLAN as both notebooks. But from my (Windows 7) laptop, which is in the same VLAN as the target laptop, I cannot ping it.
I checked, default gateway is good on both sides, as are DNS servers.
Target notebook ---- Catalyst 3560 V2 switch === Core Catalyst 3750 switch (stack) === Catalyst 3560G switch --- My notebook
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Jul 9, 2012
For some special arrangement, I would like to connect 2 access ports from a 3550 switch to 3560 switch.1 port for vlan 200, another port for vlan 201.Will this introduce bad thing to the switches?
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Sep 12, 2012
I have a Cisco 3560 connected via fiber to a Nortel 1612G. The connection is up/up, the V LAN's on the switch work as needed, but I can not ping the switch from the Nortel, and as a result I can not remote into the Cisco for management. I see in the configuration for the trunk that it is configured for a native v LAN, but I don't see it defined which v LAN's are allowed, could this be the issue? I will provide some of the config information for the Cisco side, I understand the issue may be on the Nortel end but if the Cisco part looks OK?
Port config for the trunk:
interface GigabitEthernet0/49
description port_6_1612G
switch port trunk encapsulation dot1q
switch port trunk native v LAN 120
switch port mode trunk
Native v LAN config:
interface Vlan120ip address 172.16.120.11 255.255.255.128
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Apr 25, 2012
I have a connection between switches, There are a 3560 (Gi0/37) and a 2960 (Gi0/1), the problem is in the port Gi0/37 of the 3560 switch and this is the log. [code]
I dont understand what is the problem, actually i have added the command power inline never on the port and the problem is solved, but we haven´t changed configuration.
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Jun 3, 2012
We have two Cisco switches with one 3560 and one 3750 we have created a new Vlan 4 with IP 10.1.3.x 255.255.255.0 - no shut then assigne to gi 2/0/46 on the 3560 Vlan 4 ip address 10.1.3.x 255.255.255.0 no shut then assign to FA0/45. All interfaces are up up along with the Vlan up up, we can ping the local IP address bu not able to pint the other switch.
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Jan 16, 2013
We are in the process of rolling out iPads to our offices. As part of this implementation, we need to print from the iPads to our network printers. Our network printers are mostly HP and Xerox and do not have native Apple AirPrint capabilities. As such, we have been using the FingerPrint software to share out the network printers as Apple AirPrint printers. We have a mixture of switches at our offices. Most offices utilize a 3550 PoE switch. In these offices the AirPrint traffic is being transferred successfully and everything works great. In the offices which are using 3560 PoE switches, the traffic is never seen at the iPads. We are using EnGenius EAP300 access points connected into the Cisco switches to provide wireless access to the iPads. Both 3550 and 3560 switches are running iOS 12.2(25). What might be stopping/blocking the AirPrint traffic on the 3560 switches?
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Nov 7, 2012
I have a couple of 3560 switches running c3560-advipservicesk9-mz.122-44 and they are randomly experiencing the following:
- The switch locks up with no preceding error message in the log (I am forwarding syslog to Splunk).
- Upon reboot, the switch goes through the normal startup sequence with no error messages, then for some reason reloads the flash and starts all over again. (refer to doc)
This could happen after days or weeks. Sometimes they will go through two of these reloads on boot and be fine for awhile, and other times they will be stuck in the loop infinitely. I am using this same image with all of our 3560s, but am only having this issue with two of them.
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Jul 15, 2012
I have 3 3560 switches which are configured with trunks between them. They run vlan 10, 11 & 12. I have a 'core' switch (switch 1) of these 3 to which an MPLS router is connected on vlan12. I in addition have another switch hanging off the 'core' switch via a routed link (switch 4). I have EIGRP configured as a stub and as such the IP address on the routed link at the core switch end is of a /24 from v lan 1 on the other switch. This makes the route directly connected and therefore distributed via EIGRP stubs. Switch 1 is then exchanging routes with the MPLS router (via EIGRP).
The problem I have is that from any sub net on any switch (switch 1, 2 or 3) I can ping 192.168.13.1 (switch 4). When I try and ping switch 4 from over the MPLS I am unable to. If I trace to the switch I see it reaches the outside of the MPLS router, but is then unresponsive. The same applies if I try to ping switch 1 on 192.168.13.2. Any of the other IP addresses of switch 1 respond.
The MPLS network is a managed solution to which I have no access. I'm told that the MPLS provider is able to ping switch 1 & switch 4 on the 192.168.13.x addresses from a remote router (192.168.32.2). I have tried from a switch on the same L2 sub net (192.168.32.1) and I don't get a response.
From switch 4 I am able to ping the switch on 1 of it's interfaces (192.168.19.1), but not the interface I mentioned above 192.168.32.1. There are no access lists in place on the switches and no firewalls between the sites.
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Feb 5, 2013
I have 3560's in my current environment, operating in the core/distro/access layers. The switches are in a star configuration, performs only layer 2 switching, and utilizes copper (no plans on moving to fiber).
With a fairly limited budget, I've been contemplating on upgrading the central node to a stacked 3750X to eliminate that single point of failure, and trunk the rest of the 3560's to the stacked switch. I wanted to be sure that the 3750X switches will be right for my environment (90-100 hosts), and if what I explained above is a good solution.
I'm also looking like to upgrade 6-7 of my servers (and SAN) with 10GB network cards. Do the ports on the 3750X have port densities capable of 10GB? If not, what switches provide that capability?
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Feb 20, 2013
I need to support a bunch of security cameras mounted on poles in our parking lot and an IP intercom system mounted on some gates. Because of environmental factors the switches at the poles need to be hardened and the spec from the vendor installing the gear is for GarretCom Industrial unmanaged switches which would make sense.
However when Information Security got wind of this scheme they (probably correctly) are requiring me to secure the ports that these unmanaged switches connect to. I have 2 choices: port security w/ MAC filtering or 802.1x. Because all the devices at the poles and gates support 802.1x and because I may need to go out there to troubleshoot stuff (and will invariably forget to add the MAC of whatever device I am using) I would prefer 802.1X multi-auth mode.
Problem:
When I ran a quick test on a test 3560 running some 15.0.1 code I could get a laptop to connect via 802.1x EAP-TLS successfully if it was directly connected but when I connected the same laptop via a dumb Netgear switch I confiscated from a luser it would not connect. The 3560 error said that the laptop never responded.
Question:
Before I spend a whole lot of time on this, is this something that should work? I don't see any practical use for the feature if it won't however the documentation I am using specifically mentions downstream hubs but I am not sure if they mean real hubs (which I don't think are even made anymore) or if they mean unmanaged switches.
I plan to try a couple of different unmanaged switches tomorrow and digg a little but I would like to know if I am wasting my time on something that will never work or if there is a little gotcha somewhere.
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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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May 10, 2012
Does a portable RPS device either from Cisco or another manufacturer exists, that would allow you to move primary power for a switch without causing an outage? I realize that for the Catalyst 3560 for example, you can get an RPS 2300 or 675, but my understanding is that these are made for a more permanent installation, not to mention rather costly.
It looks like the RPS 675 is rather inexpensive after all, especially in the secondary market, but still rather large for toting around.
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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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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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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)
[code]....
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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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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Dec 12, 2011
Is there a chart to show what modules will fit what swithches for fiber applications ex 2950 and 3560 switches
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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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Jan 10, 2013
I've been fighting what seems to be an increased number of outqueue drops on our core stack and edge switches for the last 3 or 4 weeks.(The core consists of a stack of 5 3750s in 32-gig stack mode. The wkgrp switches are 3560s. all are at 12.2.52) The wkgrp switches are directly connected to users. We use Nortel IP phones with the phone inline with the user PC. auto-neg to 100/full. [code] However I have tried turning off QOS on a couple of workgroup switches (no mls qos, but left individual port configurations the same) but am still seeing drops.Since I have disabled qos on the switches in question (no mls qos) (not the core tho) I am presuming these commands have no affect on the switch operation and therefore cannot be related to the problem. With QOS turned off one would presume that it is general congestion - especially at the user edge where busy PC issues might contribute. So I wanted to see if I could see any instances of packets in the output queues building up.
I wrote some scripts and macros that essentially did a snapshot of 'show int' every 20 seconds or so, and looked for instances of 'Queue: x/' where x was greater than zero.What I found after several days of watching the core stack, and a few of the workgroup switches that are most often displaying the behavior, was that I NEVER saw ANY packets in output queues. I often saw packets in Input queues for VLAN1, once in a great while I would see packets on input queues for fa or Gi interfaces, but NEVER on output queues. [ code] Additionally, when I look (via snmp) at interface utilization on interfaces showing queue drops (both core and wkgroup), they are occurring at ridiculously low utilization levels (as low as 4 to 8%). I've tried to look for microbursts between the core and a wkgroup switch where the core interface was experiencing drops, but haven't seen any (using observer suite). [code] While the queue-drop counts aren't critically high at this point, they are happening more frequently than in the past and I would like to understand what is going on... In most cases, no error counters are incrementing for these interfaces. Is there some mechanism besides congestion that could cause output queue drops?
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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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