Cisco Switching/Routing :: 3750 - Two Different MAC Addresses On Same Switchport

Feb 16, 2012

I have Catalyst 3750 running IOS version c3750-ipservicesk9-mz.122-55.SE.bin.  I have an access port that connects to a Redhat Linux version 5.4 64 bits machine.  When I perform a "show mac address-table interface g1/0/3" where the redhat machine is connected to, I see two mac addresses on this access port.  One of the mac addresses, 0025.9006.4898,  belongs the the redhat machine.  the other mac address, I have no idea where it comes from.  I tried to perform clear mac address-table dynamic g1/0/3 several times but it does not work either.

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Cisco Switching/Routing :: 3750 - Make Switchport And Then Create IP VLan?

Feb 7, 2013

Currently have two routers inside our network.

One is the default GW
One is Jump Router for ATT
Both connected to HP Procurve L2 switch

The ATT Router is to replace GW and Jump with one 3750 L3 switch.icomplish this with only one port g0/1 connected to HP Procurve?Can I make the switchport and then create a ip vlan999 all to do I just connect two ports, and hardcode them with an ip?

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Cisco Switching/Routing :: 3750 Not Handing Out IP Addresses

Jan 10, 2013

We have a 3750 running IOS ver 12.2 (44) SE, it has performed great and we have never had a problem with it. However we have noticed that when we had an outage some of our Wireless APs didn't come up as they get DHCP from the 3750. The DHCP scope said IP was depleted although there were IPs to give. We had to delete and recreate the DHCP Pool. However two days later we got the same problem and then had to do the same thing over again.

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Cisco Switching/Routing :: 3750 - How To Hide Mac Addresses

Jun 12, 2013

I Lease fiber between two locations, My operator limiting number of MAC addresses to 8 macs. Is there any possibility using some feature available in the Cisco 3750 switches to (hide mac addresses) encapsulate traffic witch flowing via operator network ?
I need to send data between locations with 1Gb/s speed. If 3750 switches can't do that, which models of switches 1 or 2U can do it. May Metro switches ?

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Cisco Switching/Routing :: 3750 IP Addresses Are Not Being Released From Table

Feb 21, 2012

we have a 3750 and use dhcp services on the switch.  every so often we run out of ip's even though we have  much less users than the size of the allocated dhcp pool.  I've noticed that the dhcp bind table is full but a ping-sweep only shows very few ip's being assinged and used.  It looks like the IP addresses are not being released from the table even though I have decreased the lease time to 8 hours.

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Cisco Switching/Routing :: 3750 Not Handing Out DHCP Addresses

Nov 2, 2011

Had a problem with a 3750 this morning not handing out DHCP addresses.  The following is a sanitized config of what the switch is using. [code] The IOS installed on the switch is c3750-ipbasek9-mz.122-55.SE1.bin.  What got my attention was that the sh ip dhcp pool PC showed 180 addresses being excluded.  In doing the math from the dhcp excluded addresses, only 64 should be excluded.
My next step was to remove the second dhcp excluded-address line above.  Doing a clear ip dhcp binding * started letting the DHCP service hand out addresses but the sh ip dhcp pool PC stil showed 180 addresses excluded.
It finally took removing the dhcp pool and putting it back in to drop the number of excluded addresses down to a value that matches the first excluded-address line.  Didnt see a dhcp bug in the bug database that would explain this.
I tried re-entering the second excluded-address line from above and saw the number of excluded addresses rise as expected.  When I negated the line, the number of excluded addresses dropped back to its previous value.

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Cisco Switching/Routing :: 3750 DHCP Server Handing Out IP Addresses To Client Connected To VLAN5 Interface

Feb 23, 2012

Haveing issue with DHCP server handing out IP addresses to client connected to VLAN5 interface.ISP Router>Firewall -(WatchGuard Drop-in mode) I have several 3750 switches and  one acting as a L3 switch. The L3 is configured as follow: [code]
If I connect a laptop to int fa1/0/10 I DO NOT get an IP address from the scope. If I connect to another interface within the VLAN 1, I get an address from the range.

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Cisco Switching/Routing :: Cat 3560 No Switchport Command Test Out Routing With Switch

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 (PC unable to ping as well as (ASA).I tried adding in a ip route of as well as  Neither produced the results I wanted allowing (PC) to ping the ASA ( [code]

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Cisco Switching/Routing :: Nexus 7K No Switchport Command Available?

Mar 22, 2013

I created new VDCs.  Since I have done so, there is not switchport command under the interface configuration.
The interesting this is that it is available on the admin VDC, but not the new VDC I created.  I cannot create a peer VPC Peer link between my 2 Nexus switches.  I did allocate ports to the new VDC and I did verify the enabled feature are the same.
why the switchport command is not available?

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Cisco Switching/Routing :: Unable To Policy Switchport Interface Of 861

Jul 24, 2012

I'm unable to apply a policing limit in a switchport of the CISCO861 router. This is my configuration:interface FastEthernet0, service-policy input wired-input,service-policy output wired-output end.

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Cisco Switching/Routing :: 3524xL - Switchport Voice VLan

Nov 10, 2012

I have encountered a different issue. When I configure " switchport voice vlan 2" under f0/2 connected to ip phone, it does not have any effect.
Below is my set up:
Sw  is cisco cat 3524 XL.
ip phone-------f0/2( vlan1)-----SW----f0/1---trunk------f0/0-CME-router+dhcp
                                                       f0/3( vlan2)
                                                       tftp server (
switch has two vlans:
vlan1 (data)
vlan 2 (voice)
Switch management int vlan 1 :
The trunk is working correctly. (code)

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Cisco Switching/Routing :: CE500 Switchport Port-security

Apr 19, 2012

I try change the configuration the port in the switch catalyst express 500, i need disable switch port port-security, a try with and save configuration with wr command, if a check the configuration de port is correct but i reboot the switch and check the configuration the port appear the switch port port-security configuration again.

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Cisco Switching/Routing :: 2960 - Multiple VLANS On 1 Switchport

Apr 30, 2012

I have a a hardware server running a VM hosting virtual servers which are all on different VLANs. My challenge now is to configure the switchport that the server is connected to, to see all the VLANs needed by this VM. The VM has an IP that is used for managing the server VMs which is on a different VLAN also.
My switch is a 2960 switch and it is presently trunked from the core switch.

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Cisco Switching/Routing :: 2901 - Multiple Subnets On Same Vlan Switchport?

Jun 29, 2012

I have a Cisco 2901 with the 4port gigabit ethernet switch module that I'm trying to get configured to have a seperate subnet for each port.  So far I have it set up so each subnet is a vlan, then on each port I use the switchport access vlan command to tell it which subnet I want that port to be on.  However, there is one port that I need to have 2 subnets on.  The way I found to do that was to use switchport trunking on that port, but it doesn't seem to be working properly. how they would configure this?  Right now I have vlan 101 as x.x.x.17/28 and vlan 103 as x.x.x.53/30.  I think where I'm getting hung up is the proper association between the physical port and the vlan subnets.

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Cisco Switching/Routing :: Catalyst 3546 XL / Switchport Port-security Command Not Available

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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Cisco Switching/Routing :: Switchport Trunk Encapsulation Dot1q Fails On A 4900m?

Jan 9, 2012

I'm setting up a new 4900m running  cat4500e-ipbase-mz.122-53.SG5.bin. I'm attempting to create Port-Channels as a Trunk for uplink to a 4503 running cat4500-ipbase-mz.122-37.SG1.bin.When I attempt the command "switchport trunk encapsulation dot1q" it errors out.

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Cisco Switching/Routing :: ME3600X Is Switchport Port-security Mac-address Sticky Available

May 5, 2012

Our customer has a Cisco ME3600X with the IOS me 360x-universalK9-mz.122-52.EY3.They are saying that is not possible to configure the "switchport port-security mac-address sticky" in the interfaces and want to know whether any additional license is needed.As far as I know there isn't any extra license to activate this feature and also I believe the ME3600 switch should have this feature with the universal IOS, isn't that right?

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Cisco Switching/Routing :: Perform STFTP On 3750 Or 3750-X?

Jun 30, 2012

Do I need the Universal image to perform stftp on a 3750 or 3750-X?

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Cisco Switching/Routing :: SG 100-16 Switch - 2 DHCP Addresses

Jan 11, 2012

I currently have a the following configuration and am unable to get more than 2 DHCP addresses for the devices connected to the Cisco new SG 100-16 Switch.The AP have no trouble handing out DHCP to the wireless clients, but we are unable to get the SG 100-16 to be able to do the same thing to wired clients.  It is currently connected to the 2960-8 in port 1.  We can get 2 devices connected without a problem, but the 3rd machine and beyond do not work.  Also, setting up a static IP does not work.  Using a static will not even allow us to ping or tracer back to any devices beyond the SG 100-16.

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Cisco Switching/Routing :: 2610 Configured IP Addresses On Interfaces

Feb 10, 2013

I'm working on my CCNA.  I purchased an old router 2610 with two ethernet ports.  I configured the IP addresses on the interfaces and added the default gateway.  I configured NAT to go out my ATT DSL router to the internet.  With the 2610, I'm able to ping the back end or internal DSL router, but I can't ping the front end, external router, or out to any internet site such as google. 

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Cisco Switching/Routing :: 861 Need DHCP Server With Static IP Addresses

Feb 2, 2013

I used to use a CentOS self-made server for intranet for my little office, but I bouth few days ago a Cisco 861 router to replace the linux box.
1. I have 2 public IP classes from my ISP. 1 class is limitted to 80mbit upload, the other to 30mbit upload. So I need some sort of DNAT to be able to know exactly which intranet computer uses big internet and which one limitted internet.
2. I need DHCP server and with static IP addresses (one computer must always have the same IP address, etc).. i have my needs for this.
3. Also I need external access to some servers inside (web, ftp, etc) [code]
So far so good, all looks simple and I can achieve this in 2 hours on a centos linux box (correct routes, ip forwarding enabled and few iptables rules for NAT/SNAT/DNAT).
But on this brand new Centos router well, i'm not even successful in pinging the outside world, nor the inside world I'm tired of reading the forums, the documentation..i want (at first) a simple scenario: vlan+dhcp, fa4 with 1 public ip address and ACCESS to the real world. I wasn't able to achieve not even that much. [code]

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Cisco Switching/Routing :: Restricting Mac Addresses On 4506 Switch

May 14, 2013

We want to permit certain mac addresses on the cat 4506 switch wherein only those mac addresses will get access to network.
Configuration Planned: For testing purpose we have created mac access list on cat 4506 and deny laptop mac address in this access list. The mac access group is applied to the port where the laptop is connected to cat 4506.Even after applying the mac access group on the port, the laptop is able to ping the vlan ip of cat 4506 [code]
laptop with ip address connected to port 2/1 is able to ping even after applying the mac access-group
Note-we have tested same configuration on cat 3560 and its working fine. We apply the mac access-group command on interface and clear the arp-cache and we are not able to ping vlan interface ip. The moment we remove the mac access-group,ping starts again.

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Cisco Switching/Routing :: ASA 5505 - Multiple Outside Statics IP Addresses?

Dec 14, 2012

I have an ASA 5505 with Security Plus License ?I have 5 Static IP Addresses from my ISP?I have the following interfaces. Outside (vlan 2) / Inside (vlan 1) / Guest (vlan 3)For my Vlan3 guest network I have set it up so that DNS must be routed through's DNS servers ( for web filtering, etc ) However, its using the static ip that I have plugged into the ASA.
What I would like to accomplish is to put my inside interface (vlan1) on another static ip for outside access if thats possible, so that I can route those clients through however however giving them more web privlieges than what the guest network is getting.

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Cisco Switching/Routing :: 1941 Configuration With Range Of WAN IP Addresses

Oct 23, 2011

I have a 1941 router tt needs to be setup with the range of WAN ip addresses ip nat inside outside don't allow me to use it..How can i configure on the router to ensure from outside i'm able to access to firewall ( ?

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Cisco Switching/Routing :: 5505 Running Out Of Available IP Addresses On Subnet

Oct 7, 2012

I have a customer who has an ASA 5505 that is handling the routing for their internal network. They are running out of available IP addresses on their subnet They have dumb switches that don't suppport multiple vlans or trunking & they are only able to connect to one switchport on the ASA. He doesn't not want to purchase any new equipment or rearrange their existing equipment at this time. The customer would like to statically assign IP addesses for 192.168.1.x & 192.168.2.x and have the ASA hand out DHCP addresses for 192.168.3.x addresses. The customer suggested configuring a super subnet. A address scheme would provide an ip range - on a single VLAN. I know this is an unconventional way to setup an internal network & I will definitely advise the customer that this should only be considered as a temporary solution until they get more appropriate network equipment.

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Cisco Switching/Routing :: ASA 5505 - Blocking Traffic To Specific IP Addresses

Sep 24, 2012

I inherited a Cisco ASA 5505 and am trying to piggy back the device off of an established Network.  Here is the basic layout: (Core Router - Handles DHCP/DNS) (ASA 5505 - Piggy backing off of Network)
192.168.40.x (ASA 5505 - VLAN)
I'm able to get onto the Internet without any problems.  Devices from the 192.168.10x Network can not ping the inside VLAN1 (192.168.40.x).  However, I would like traffic going from the inside VLAN to the Outside VLAN to be blocked, except for and  I've tried using ACL's but end up killing my Internet connection. is the default route and is how I get out to the Internet.  Is this possible?  Essentially, I'm trying to set up a small Network that guests can connect to.  The idea is that they can get to the Internet, but that is it. They can't get to internal resources on the 192.168.10.x Network
Here is the config:
ASA Version 8.2(1)
hostname ciscoasa
enable password EeCsulrpu.9LalEE encrypted


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Cisco Switching/Routing :: WS-C3560E-24TD IP SLA Responder And Conflict IP Addresses

Sep 8, 2012

I have a network topology which you can see on image. All routers are Cisco 3745 with IOS (C3745-ADVENTERPRISEK9-M), Version 12.4(12). SW1 is L3- switch Cisco Catalyst WS-C3560E-24TD  with IOS  (C3560E-UNIVERSALK9-M 12.2(58)SE2). [code] After that I have problem. When PC with OS Windows 7 begins to work in corporate network, it sees "coflict ip addresses" and doesn't work with network. I've used wireshark and seen, when the PC send arp request a SW1 always send arp reply (see attached file). I think problem with command "ip sla responder", but I haven't searched information about it and I want understand this is bug or normal functioning.

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Cisco Switching/Routing :: 1900 Series Router Not Giving Out IP Addresses

Oct 15, 2012

I've got a problem with DHCP running on a cisco 1900 series router, 1921 to be precise. The Data VLAN works perfectly, i configured a ip helper address and its working. Problem tough is VLAN 20. This is the voice vlan. As u can see in the config below, this has been configured using VRRP and VRF for failover purposes. I did more of these configurations, and they all worked fine, just not with this particular router!
As u will notice i deleted all the not needed to know information or i X'ed it!
version 15.1
service timestamps debug datetime msec


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Cisco Switching/Routing :: 2900 XL VLAN Drops / Relearning Addresses?

Dec 16, 2011

Had an odd issue that started up last few days..  Have a port on a cisco 2912 XL that keeps dropping (drops all packets) on a certain VLAN, but still passes others.  Spanning-tree for that vlan says all ports are in forwarding status.  VTP says that VLAN is still active.
This network is a little strange...  2924XL -> MotoPTP -> 2912XL -> Moto Canopy Array -> Some sites with cisco, some without all feed through canopy controller switch to single port (fa0/8) on 2912.
Getting a few of these on terminal monitoring, %RTD-1-ADDR_FLAP: FastEthernet0/8 relearning 5 addrs per min...  Sometimes this is fa0/8, fa0/10, or fa0/1.
I'm thinking the switch has just gone nuts, cause fa0/1 is direct connected to a router used for VLAN1.  fa0/8 is connected to a dumb switch on a canopy CMM as a trunk which i enabled bpdufilter on because of some spanning tree issues on VLAN1.  fa0/10 is connected to canopy PTP back to the 2924 as a trunk. VLAN69s router is off the 2924. So there aren't really any possible alternate packet paths to this switch from another switch.
I also setup SPAN and captured all packets from fa0/8 and fa0/10 (seperately) and never seen packet storms of any kind on either VLAN1 or VLAN69.Further testing with debug, nothing on spanning tree, nothing on vtp, but on ethernet-controller addr I got some interesting results showing one mac moving from fa0/1 to fa0/8 and back to fa0/1 but it never moves, its the routers mac that is connected directly to fa0/1.  Same with some macs on the other side of the PTP link saying they are bouncing from fa0/10 to fa0/8 and back to fa0/10 which isn't possible

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Cisco Switching/Routing :: 3120X - Blade Mac-addresses In Wrong VLAN

Feb 12, 2013

- Incoming frames on three of a blade's four switchports are being put into VLAN 1 even though the ports are either in other access VLANs, or are configured as trunks with different VLAN IDs being tagged by the server. - When the ports go down the access VLAN is removed from the port.
Switch stack: 4x WS-CBS3120X-S, 12.2(58)SE1
HP blade: HP BL460c Gen8
This combination has been used successfully elsewhere.
Switchport configuration:
interface GigabitEthernet1/0/13 -------> THIS PORT IS OK
switchport mode trunk


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Cisco Switching/Routing :: Stacking 3750-X With Universal Image With 3750-G Running BIN Image?

Oct 10, 2011

I'm looking at adding a Cisco 3750-X switch running c3750e-universalk9-mz.122-55.SE1 (IP base license) into a stack of 3750-G switches running c3750-ipbasek9-mz.122-55.SE1.bin Given that the version and feature sets are the same I don't forsee any compatibility issues. Would there be any reason why a universal image wouldn't stack correctly with other switches running the single .bin file?

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Cisco Switching/Routing :: 881w-gn-a-k9 Access Point Not Serving DHCP Addresses

Jan 27, 2013

i have to Bridge the AP to VLAN1 which has the DHCP pool. For some reason when I try to do this from iOS console it tells me that gig0 is not a bridgable interface. I am newb to Cisco iOS (24 hours new ). I got the Cisco Configuration Professional working and would like to fix my issue through there if possible? why my AP wont get anything but APIPA addresses?

version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption


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3750 - Craft Helper Addresses So DHCP Requests Go To Proper Server

Dec 15, 2012

Setting up a stand-alone WDS/PXE server.Current we have helper addresses setup to forward the DHCP requests from the different VLAN's to the DHCP server. The WDS/PXE server we are setting up is on its server. How do we craft the helper addresses so DHCP requests go to the proper server hosting DHCP and PXE requests go the WDS server?

Everything I seen on Microsoft Technet, lists using Helper Address as the recommended way, but assume both services are on the same server. Our helper address is as follows on each VLAN interface in router: ip helper-address X.X.X..This is a Cisco 3750.

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