Cisco Switching/Routing :: 3560 Command Shows Two Devices Connected Through Same Local Port?
Oct 14, 2012
show cdp neighbors command shows two devices connected through the same local port?I have a Cisco 3560 that when I issue the "show cdp neighbors" command I get the following results: [code]
the question is why is this showing that Gig0/3 is being used twice to connect to two different devices. I have verified there is no hub connected to this port and in fact Switch3 is not connected to Switch1 at all yet it still shows up in the CDP table.
I have cleared the CDP table on every device at this location and still get the same results.
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Aug 6, 2012
We just installed a Cisco ME-3400EG switch at one of our sites. A Cisco C3750X switch is connected to the 3400. When we run the command CDP NEIGHBORS, the 3400 shows no devices. We can access the 3750 via the 3400. Also, when we run CDP NEIGHBORS on the 3750 we do not see the 3400 (but other devices are displayed). How can we get CDP to display the devices on the 3400? We have already tryed CDP RUN.
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Oct 11, 2010
Any way to test in a lab what would happen if a tech mistakingly added "switchport voice vlan XX" to a trunk port? I am try to do some RCA on an issue and this has been identified as a possible cause by one of my techs.
The config is Switch1------Switch2--------Switch3 Each interswitch connection is configured as a dot1q trunk with all vlans allowed. The link between switch2 and 3 is where switchport voice vlan 10 was added. Switch1 is a 3750 and 2/3 are 3560's.
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Feb 7, 2013
I wounder if there is any way to ping the local deviceses connected to a network hosted by a Cisco 1921 router? I wan't to be able to ping the device(computer name) but currently cant do that.
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Dec 20, 2012
In my LAN environment, I'm using two cisco SG300-10 switches. Both switches are connected by GE10 on both switches, where both ports are set to trunk.Now on all ports 1-9 on both switches, I'm having client computers attached. So I set ports 1-9 to "access" mode.All interfaces on any switch is left in default vlan.
Is it normal that I see all traffic from all connected devices on any port where I connect a listening device?What I'd like to achieve is, that only traffic that is meant for a specific workstation is actually forwarded to this workstation. By now it seems that I get all the traffic from everybody.
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Apr 16, 2013
I have installed a switch (3560) that was from another site and changed all it's config and hostname etc and it is now live, however the syslog messages still see the old hostname, what could be causing this?
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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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Dec 8, 2011
The last few days I've been exploring options in getting rid of some old routers accross a wan connections. I have a cat 3560 to play with and I thought I would try and use the no switchport command test out routing with switch. I've got some type of route issue and I tried a few things which I thought would fix the issue but had no effect. I'll post the config and a few commands so you can see what the basic setup is.
Here we can see in the arp that it knows about both 10.7.1.2 (PC unable to ping 10.3.3.254) as well as 10.3.3.254 (ASA).I tried adding in a ip route of 10.7.0.0 255.255.0.0 10.3.3.110 as well as 10.3.3.254. Neither produced the results I wanted allowing 10.7.1.2 (PC) to ping the ASA (10.3.3.254). [code]
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Mar 6, 2013
I have an EA 4500. Tonight I was trying to see what devices were connected. The window shows 0 devices connected, although about 20 devices are connected and working. When I click on "Devices Connected", I get the spinning wheel, and after multiple attempts by the application to list devices, I receive a message that the application does not work. I have the latest firmware installed. This is a recent issue. I have not made any changes to network configuration, nor to any of the devices that all have internet access. I will note that I did not set up a separate SSID for each band. But that did not seem to be an issue in previous months. I also cannot access the router ui from my windows 7 desktop. I can access the abbreviated ui through my Android phone. I tried connecting through smart wi-fi and by ip of the router. I just get the endless spinning circle of dots. I am running Windows 7 all up to date. All drivers are up to date.
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Jun 17, 2012
I am trying to find out what devices are connected to my router. I have had some illegal downloading from my IP address but it has not been done from my computer. It is showing in Cisco Connect that I have 15 devices connected, I should have no more than 6 devices connected so trying to figure out who is connected on my computer.
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Dec 12, 2012
Is there a command to globally invoke rw or ro feature of SNMP on a 356024P switch?
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Feb 25, 2013
We have two catalyst 3560 switches running c3560-ipbasek9-mz.122-58.SE2.bin They are connected using etherchannel using gi 0/21 - 24 interfaces.
on 3560-1 switch, there isn't any ip-default gateway or ip route configured. It only have 1 interface vlan configured.
on 3560-2 switch, there is ip default gateway configured along with 1 interface vlan.
What i dont understand here is that, i can reach out to other subnets from 3560-1 switch in which the routing is not enabled?
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Jan 30, 2012
I have an all gigE 3560. I don't use the management FE0 port on the back. I was thinking to use that for a 100Mbps WAN connection.
Seems to work just fine when I plugged in an test. But I am not routing across that link yet as I still need to setup the far end.
Is there any reason this would not work? I would like to not burn a gig port if the max throughput of the circuit is 100Mbps.
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Jul 30, 2012
I am configuring a Cat 2960 port for connecting a VOIP phone, authenticated by MAB. On connecting the phone, I get the port authenticated and assigned to the correct VLAN, with LLDP-MED advertising the correct voice vlan. However, I then see no traffic from the phone on the switch. I can see the MAC address of the phone is learned in the right VLANs, but the mac address is showing as "Drop", which normally means the address is statically configured to be blocked. There is no static mac address table blocking configured on the switch.
Switch Version
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 50 WS-C2960-48TC-L 15.0(1)SE3 C2960-LANBASEK9-M
Port configuration
interface FastEthernet0/1
description "Standard user port"
[code].....
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Feb 28, 2013
I've got two two 3560s switchs, (WS-C3560G-48TS-S) that I'm trying to connect to each other using the GB ports over Fibre. We purchased the following GBICs, SFP 1000SX Transceiver and when we put them in the port it shows (err-disabled). Below is some information I pulled from one of the ports, but doesn't matter what port I use they all say the same thing.
ProdSwitchSW1#show run int g0/51
Building configuration...
Current configuration : 37 bytes
!
interface GigabitEthernet0/51
end
[code]....
Configuration register is 0xF
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Dec 1, 2011
I have a CAT 3560 connected to a ISR 2911 The 3560 has 2 subnets ( 192.168.1.0 /24 and 10.10.10.0 /24) The 2911 has interface GigabitEthernet0/1 on the 192.168.1.0 /24 and another GigabitEthernet0/0 on a WAN connection 172.16.7.246 I need to NAT both the 192.168.1.0 /24 and the 10.10.10.0 /24 to the single address 172.16.7.246 I have to use route-maps . I have IPSec VPN's and ZBF on the 2911 My problem is the NAT does not work for the 10.10.10.0 /24 network!Why?is my only option to use trunking between the 3560 and 2911 and subinterfaces on the 2911? I want to avoid sub-interfacing.
=============================================================
On the Cat 3560=====================!vlan 40name the 192.168.1.0 /24 subnet!vlan 60name the 10.10.10.0 /24 subnet!interface FastEthernet0/7description Connection to Router Gig0/1switchport access vlan 40!interface FastEthernet0/16description Connection pc host on the 10.10.10.0 /24 subnetswitchport access vlan 60!interface Vlan1no ip address!interface Vlan40ip address 192.168.1.4 255.255.255.0!interface Vlan60ip address 10.10.10.10 255.255.255.0!ip classlessip route 0.0.0.0 0.0.0.0 192.168.1.1
=========================
The host on the 10.10.10.0 /24 network has the 10.10.10.10 address as it's default gateway The host can not access the WAN thru NAT....
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Jan 11, 2013
In my organization we have several 2950T that conected each other. We have 4 floor with each floor have 1 sw except 4th flr have 3 sw.
Main server, apps, db ( 15 units) connected to core sw at 4th flr. Currently the problem is others devices can't connected to the server at core sw. Test ping and the network to core sw is intermittent problem. When ping 100 times only 30 reply. After 10 minutes the connection restored. Ping 100 times successful. It will not having problem again until the next day. This already happen 3 days. Any command for me to use to check if port or the switch having problem? Any log i can collect
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Jan 30, 2013
I have a Cisco 887M router which I wish to restrict the devices allowed to be connected/allocated an IP address to two, and *only* two.
I can't, for the life of me, find out how to allow these two devices to connect to ANY port - I can configure a MAC restriction on a single port, but I don't know how to make it so that I can allow JUST these two devices to connect to any port in the 4 port switch/VLAN (VLAN 1 is used because the mongrel who set this up was lazy). I know the MAC addresses I want to allow
How I can do this? I *can* restrict any given port to the two MAC addresses - but if I try to add the MAC addresses to another port, they get removed from the initial one. I need to be able to have them connect to ANY port and work, but allow NOTHING else to work.
For those wondering, this is to counter a user who is utilising company resources for purposes not approved - and costing us quite a bit of money in the process.
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Nov 14, 2012
i just want to ask whether i should do some configurations or not on my cisco switch 4500 L3 regarding the error of 500 invalid port command when host try to access FTP active on to FTP server, i just did static route on gig interface with no switchport mode to that host network, all traffic type was allowed except the FTP with active mode?
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May 3, 2013
i have 4507R with dual supervisors (WS-X4013+10GE) with IOS cat4500-ipbasek9-mz.122-46.SG.bin the supervisor module are in 3 and 4, and I want to connection port 5, but i have interface and line protocol down "inactive" error.
So I realized to use command "hw-module" to change the module to GE port. However, I am not able to use the command as" I cannot use the command "hw-module uplink" as well.
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Apr 24, 2012
I am looking to find a command or counter to tell me if a cisco switch port on a 4510 was ever up and passed traffic. I want to shutdown all unused switchports on our access switches. But before I do that I need to make sure device is just not off or the person is away on vacation. If I do sh int interface, is there a counter I can reference.
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Jan 31, 2012
I have a 3560 8 port switch. Int gi0/9 is trunked to another switch downstream. When I try to configure int gi0/10 to trunk to a switch upstream the interface on the switch goes down and I have to either reboot the switch or plug directly into the switch and telnet into it to turn off trunking on the interface. When I configure trunking on the interface on the upstream switch that connects to this interface the same happens on that switch. The upstream switch is a 3750 with 12 sfp ports. Several interfaces are trunking to other switches from this switch. Spanning tree is not configured on the 3750 at all , and is not configured on either gi0/10 or gi0/9 on the 3560. I was consoled into the 3560 during a reboot after the interface went down, a message came up that said something like "Spanning Tree returning gigabit ethernet 10 to constant state" Why would I get this message if spanning tree is not enabled on the gig ports on either end of the trunk? There is no loop to require spanning tree to shut down an interface. I have several other 3560's configured as I would like to configure this switch and they are trunking without issue.
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Oct 21, 2012
I've just installed 2 of these in my workplace on a PLC network.I'm now looking to set one of the ports up as my diagnostic port and would like to be able to mirror any of the other ports to this port.I believe it is called SPAN on Cisco switches.The only reference I can find to it is configuring via Telnet which I haven't got a clue about.On my old Wiedmuller switches it was just a few clicks away.
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Apr 18, 2012
I have a 3560 switch with the following ports config [code] I would like to use theses ports on a different vlan to connect 4 pc's to them. Can I just remove them from the vlan, remove the trunk switchport and set up on the vlan i want them on with no trunking?
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May 1, 2013
Our enviornment includes 3560 switches and 2800 routers. We have a few remote offices using an application on TCP port 1677 that use far to much bandwidth. Our WAN provider can throttle and police this for us, if I can TAG this traffic, for example all Traffic from Florida using the Groupwise app on TCP uses TCP port 1677 and I want it tagged with CoS 3.
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Oct 26, 2011
Im trying to follow along documentation i see via train single videos and some online resources. I am trying to enable port security.I have a Catalyst 3546 XL when i type in "rtr1# switchport ?""port-security" is not only of the options to choose from. I have already set this as an access port.
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Apr 9, 2013
a switch port is shutdown, but when i use NO SHUTDOWN command it is working and shows administratively down. like this command does not affect on it. i should enable this port? what can i do btw, port is not in errdisable and portfast is enabled.
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Jan 3, 2012
I want to implement port-based and MAC-based in these two switches: 2960 & 3560 (both of them have this IOS version: 12.2(55)SE1). And I haven't found a way to implement both of them at the same time. This is what I got:
ip dhcp use subscriber-id client-id
ip dhcp subscriber-id interface-name
ip dhcp excluded-address 192.168.0.0 192.168.0.2
ip dhcp excluded-address 192.168.0.251 192.168.0.255
[code]....
With this configuration I can use port-based, but not MAC based. If I remove the first two lines and change the last line for this one:
address 192.168.0.7 client-id 0112.ae1d.af58.60
Then, the computer with that MAC address got the correct IP, but then the port-based doesn't work. Also, I got this line in the interface what I want to use MAC-based:
ip dhcp server use subscriber-id client-id
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Mar 3, 2012
I am using 3560.IP rouitng is being turned off on this.Curious to know if I will create etherchannel or port channel.I think etherchannel.Correct me if I am wrong.On connecting switches I have vlan10,20,30 to be allowed.I am sure I need to allow these all vlan in 10,20,30 which are on the trunk port on each side switch.Post that will add channel-port lacp and make it in active mode.Is that correct.This way traffic will be load-balanced/aggregated on minimum 2 ports who are the part of this.
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Mar 6, 2013
Problem is that at some C65K I have directly connected Unix servers and the don't show MAC address at port, and same has happened at 3560 switched where I have too Unix based equipments connected. When use show mac-address interface XXXX, nothis appears at port and tested them with other equipments that worked fine.
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Apr 10, 2012
Assume I had Catalyst 3560X/3750X with 24 ports. The partnumber is WS-C3560X-24P-LI would like to how is the numbering defined if the switches have a C3KX-NM-10G installed with 4 SFP-GE-L.
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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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Jul 10, 2012
I have a pair of 3560's configured with dot1q trunks between them carrying a number of VLANs.
Once deployed there will be a requirement for these physical trunks to be disconnected from time to time. Knowing that this is inevitable I am trying to minimise the period of time for the trunks to recover once the physical connectivity is reinstated.
All of the VLANs on the switches are configured for Spanning Tree Rapid PVST. Current time for the trunks/VLANs to come up is around the 4 second mark.
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