Cisco :: How To Configure A Trunk Port As Network Port

Feb 27, 2012

What is network port ? I want to configure a trunk port as network port, so that the trunk port becomes the network port for all the VLAN associated to the port.

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Cisco :: 2504 Configure Rogue Detector AP And Trunk Port?

Dec 14, 2012

I'm using a 2504 controller.  I dont have WCS.My questions are about the best way to configure a Rogue Detector AP.
In my lab environment I setup the WLC with 2 APs.  One AP was in local mode, and I put the other in Rogue Detector mode.The Rogue Detector AP was connected to a trunk port on my switch.  But the AP needed to get its IP address from the DHCP server running on the WLC.  So I set the native vlan of the trunk port to be the vlan on which the WLC management interface resides.  If the trunk port was not configured with a native vlan, the AP couldn't get an address through DHCP, nor could the AP communicate with the WLC.  This makes sense because untagged traffic on the trunk port will be delivered to the native vlan.  So I take it that the AP doesn't know how to tag frames.Everything looked like it was working ok.
So I connected an autonomous AP (to be used as the rogue), and associated a wireless client to it.  Sure enough it showed up on the WLC as a rogue AP, but it didn't say that it was connected on the wire.  From the rogue client I was able to successfully ping the management interface of the WLC.
But the WLC never actually reported the rogue AP as being connected to the wired network.So my questions are:
1. What is the correct configuration for the trunk port?  Should it not be configured with a native vlan?  If not, then I'm assuming the rogue detector AP will have to have a static IP address defined, and it would have to be told which vlan it's supposed to use to communicate with the WLC.
2.  Assuming there is a rogue client associated with the rogue AP, how long should it reasonably take before it is determined that the rogue AP is connected to the wired network?  I know this depends on if the rogue client is actually generating traffic, but in my lab environment I had the rogue client pinging the management interface of the WLC and still wasn't being picked up as an on-the-wire rogue.

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Cisco Switching/Routing :: Lose Lot Of Bandwidth Over Trunk Port (vs Access Port) 3750g

Feb 18, 2013

I have a 3750g connected to a "core" switch stack of 7 other 3750g's via 2 GigE ports in a trunk.  This is currently in a switchport mode access port- channel so only the default vlan data is sent over. Now we have a need due to physical location of these switches, to allow vlan20 (DMZ) from this 3750g to the switch stack.  I will configure a few ports on the switch stack for vlan20 and they need to be able to talk to the stand alone 3750g.To do this I will change the port channel on both endpoints to

-switchport trunk ecapsulation dot1q

-switchport mode dynamic desirable
also making the appropriate change on the interfaces belonging to this trunk.My question is, now that its a trunk port that carries multiple VLANs, how much is the bandwidth reduced on that 2gbps link?I have a very active VLAN (10) on the stand alone switch, but on the core I'm not going to be assigning VLAN 10 to any ports.  So does traffic from VLAN10 even come across the trunk (wasting bandwidth) if no ports on the core side are assigned to it?  I really just need vlan 1 and 20 (for now).

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Cisco :: Why Wouldn't Use Spanning - Tree Portfast On Trunk Port Other Than Trunk Between Two Switches

Apr 11, 2013

Is there really any reason why you wouldn't use spanning-tree portfast on a trunk port other than a trunk between two switches? We have it enabled on all ports except for the fiber trunk between two non-stacked switches and the trunk ports connected to our Astaro firewall.I'd like to enable it on the ports to the firewall unless that would cause issues.

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Routers / Switches :: Trunk Port Connecting But Network Tree Not Available On Pc

Jun 26, 2012

trunk port connecting but not allowing access to tree; i connected 4506 port to 3550 port; and i set both to switchport mode dynamic desirable; the 4506 port was set with switchport mode access and switchport mode access vlan ?; i used the command default switchport access vlan to remove the vlan; the ports are up but as I stated I cannot connect ot our workgroup tree

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Cisco WAN :: 857 ADSL Possibility To Configure Fast Ethernet Port As WAN Port

Apr 4, 2012

I have a Cisco 857 router which i used for Internet connection with RJ11 connectior (ADSL0 POTS) but now the ISP has changed the internet link with PPOE type and the ONT connection is RJ45 , Is there a possibility to configure one os the Fast Ethernet ports as WAN port for internet.

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Cisco Wireless :: Trunk Port On WAP 321?

Feb 12, 2013

i have plan to deploy cisco WAP321 on my customer, and after rading the document about WAP321, it said the WAP321 support for VLAN ID feature, but i cant find whether it support for trunk port because i would like to connect the WAP 321 LAN port to the cisco SMB switch SG300/SG200. is the trunk port already enable on the WAP 321 LAN port so i dont need to configured it or not ?

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Cisco :: Obtaining Vlan On Trunk / Port

Jun 29, 2012

I'm trying to obtain the vlans on a trunk and also whether the port is a trunk. Ive seen VTP mib, but these dont appear present on my switch (2950).

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Cisco WAN :: 2801 And Switch Trunk Port

Apr 20, 2012

1- Cisco Router
Eth0/0 : Ip address /24   == connected my laptop of
 /1: Ip address : /24   = connected cisco swith

2 - Cisco Switch
VLAN 2 Name : Sales : ip address 192.168.3. 1 = connected computer
VLAN 3  Name : Marketing : ip addres = connected computer

So I want my laptop that connected the router Eth0/0 Interface should access both VLAN 2 and VLAN 3 computers

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Cisco :: Customizable Trunk Port Group In LMS 4.0?

Jul 19, 2011

How can I add devices onto the customizable group1?  I am trying to creat a group of trunk ports and monitor just the up/down.

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Cisco AAA/Identity/Nac :: NAC 4.1.6 Managing Trunk Port?

Sep 1, 2011

Running Cisco NAC 4.1.6 OOB on the LAN.  For some reason in the middle of the night, the snmp trap mac-notification added command appeared on the trunk uplink port of one of our switches. 

I don't know exactly when the command was added but at 2am when the backup of the config was taken, it was there.  At around 4:30am, the uplink went off-line.  Is there anything within NAC that would push a change like that automatically to a switch.  We do have NAC Profiler running on the network also.The problem was in a branch office so I only got the information second hand what was on the switch itself.  We moved the uplink to a different port which allowed the switch to show up on the CAM again, however when I viewed it, the uplink port was set to controlled! 
Does this make any sense?

how long devices will stay in the certified device list if no timer is configured to clear it out?

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Cisco WAN :: 1800 Router - Trunk Port L2 Switch

Feb 24, 2011

Currently I have a 4510-48g HP3COM switch as a core switch for my 4 VLAN network (which I hope to send back cause it doesn't do what I wanted it to do... PBR, which is what I need to route specific VLAN's to specific interfaces on the sonicwall,.. cause sonicwall dont understand trunk or spanning tree,. meh!) This may not happen so I've dug out an old CISCO 1800 sdsl router that has 1 FE0 port and 8 other ports, FE 1-8.
The first thing I need to do is get everything to talk to each other. So I plugged the switch into it via its configured trunk port, and configured 4 sub interfaces on the router 1800 and all seemed happy as larry and working. The problem I have is I dont seem to be able to create sub interfaces on the other ports!?


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Cisco Switching / Routing :: WC2948G - Configure LACP Trunk And Multiple Trunk

Feb 12, 2012

we recently aquired a managed services job and have to do a overhaul of the vlan configs and have a whole dozen WC2948G's trunk between a set of ports as well as trunk out a LAG channel setup to non cisco equipment. the deal is the lacp-channel works properly on both ends but no routing of vlans between ports and between the lag trunk are working.
theres alot of settings in the config and im planning on clearing it and starting from scratch but before i do i want to know where my problem lies.


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Protocols / Routing :: SIP Trunk Port Range (VOIP)

Aug 14, 2012

I've recently set up a PC-based IP PBX in our small business which uses a SIP Trunk for up to 3 simultaneous voice calls. Ports needed to operate include 5060 (SIP-UDP) and then a huge range of high-number UDP ports which I believe is for the 'media' or audio. Let's call the range UDP 49,152 to 64,512. I only know a little about the SIP protocol but my understanding is that each call will randomly use a few ports from this range across which will pass audio, Is there a need to have such a wide range of ports open? If my SIP trunk is only capable of 3 simultaneous calls then it seems only 9 or so of those open ports could get used at once. Could I not just open, say a range of 100 ports and be fine, thereby reducing the security risk?

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Cisco WAN :: Port Security Between Two Switches 3750 Or 3560 Using Trunk

Sep 2, 2012

Is it possible to use Port Security mechanism between two switch (3750 or 3560) ports while trunk has been configured? If it's not possible, is there any other way to ensure that no other Switch can be connected other then the one switch which has been configured/placed by a network engineer?

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Cisco Switching/Routing :: 6509 Trunk To Port Channel

Apr 22, 2012

I have 2 Cisco 6509 switches linked together via single Fibre as a trunk.I want to change this to a port channel where I will add another 3 fibre ports to the port channel but what order do I do this to minimise any disruption.

1-Configure PortChannel and add the 3 new ports, this will bring up the Port Channel but what effect will this have on traffic currently going over the single Trunk link? Will spanning tree go mad, how will switches react?

2-Convert existing Trunk link to Portchannel then add in new ports to PortChannel, I guess in doing this there will be a small hit on traffic as it changes to a port channel.

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Cisco WAN :: 3560G - Trunk Port Not Forwarding VLAN Traffic

Nov 13, 2012

I have got 2 Cisco switches (3560G and a 3560X) connected by a trunk port. see config below:
3560G#sh run int gi0/26
Building configuration...
Current configuration : 130 bytes

I can't seem to get VLAN 79 through to the first switch (3560G). Beyond this switch there is a router with acts as default-gateway for the respective VLANs. For VLAN 79 it is I can ping this from the first switch but can't ping it from the second (3560X) switch but can ping which also is the default gateway for this switch.

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Cisco Switching/Routing :: 6500 / Each Port Is Trunk And Carry Same VLAN

Dec 6, 2012

can i have 4 links from an ESX server to 6500 , each link represents a trunk link carries each the same 2 VLAN , 100 and 101 , keep port-channel out of the picture , does it work well?

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Cisco Switching/Routing :: 3560 Multiple Switches One Trunk Port

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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Cisco Switching/Routing :: 3560 - Trunk Port Recovery Time

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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Cisco Switching/Routing :: Rate Limit Trunk Port On 3750?

Oct 3, 2012

Is it possible to rate limit on a L2 trunk port on a 3750?
current port config and ios are as follows;
interface GigabitEthernet1/0/50
description ***  Connection to Fiber Link  ***
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,172
switchport mode trunk
i was wondering if the "srr-queue bandwidth limit 10" command would work to limit the output from this interface to be 10 % of the port bandwidth and then the same command could be done on the other side.

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Cisco Firewall :: ASA 5505 Switch From Mode / Access Port To Trunk On The Fly Via CSM

Jan 20, 2013

Can I configure the Port at the ASA 5050 from Mode: access Port to trunk during the FW is running in a production area without console access ?As I know at the 5505 ist should work?

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Cisco Switching/Routing :: 4507 Passing A Trunk Through An Access Mode Port

Mar 15, 2012

we have a scenario that consists of a Cisco 4507 series core switch with more than 20 vlans which is connected to a C2960G switch( in a nearby building)  using a trunk by a fiber connection. Up to this point everyhting is fine . VTP domain is configured on the core switch and we have all of the 20 vlans present  correctly on the edge 2960G wich is part of course of this same VTP domain.the fiber connection goes from core switch to a  "in the middle location"  where we have a fiber patch panel that is connected in a jumper style to another fiber patch panel going to the destination building where the C2960G sits.
Now imagine that Fiber connection from this middle location to the destination C2960 edge switch is down for any possible reason meanwhile the fiber connection from Core switch 4507 to the middle location is still intact.In the same time, in this middle location , we do have a wireless connection which links 1 Cisco 3750G switche ( a different infrastructure and different VTP domain) to another C3560G switch which sits on the same Room in the nearby destination  building where we have the edge C2960G, An idea came to me is to connect one of the fiber port (core) in the intact fiber patch panel coming from Core switch 4507    TO  an access vlan configured switchport in the 3750G  switch ( this switchport will belong to a vlan designed only to trasmit the vlans on the trunk coming from 4507 core switch say VLAN 10) then connect one VLAN 10 access switchport to the destination C2960 edge switch ( the switchport on the c2960G is still a trunk)Will this solution work and all of the 20- 4507 core switch vlans arrive to the destination C2960G ? Or we do need something that tags the 2 VLAN 10 switchports  like switchport dot1q tunnel like QinQ

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Cisco Switching/Routing :: 6509 - Can't Change Native Vlan On Trunk Port?

Jun 6, 2012

I have several closets with Cisco 3560 on the edge that I'd like to change the vlan that's used for the management vlan on each. In the core I have a Cisco 6509 with Sup720's.
I'd like to do this by changing the native vlan on the trunk port on the core 6509 interface that connects to the 3560. and leave the management vlan on the 3560 as vlan 1.
Seems trivial but what I tried didn't work and I didn't have the window to troubleshoot. I'll paste the simplified configs for  the interfaces  below
6509 configs:
interface Vlan50ip address!interface FastEthernet


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Cisco Switching/Routing :: Unexpected Traffic On Nexus 5000 Trunk Port?

Feb 6, 2013

So I took a laptop with wireshark and plugged it into a nexus 5000 port that is configured as a trunk with 3 vlans allowed on it. The laptop was seeing all kinds of traffic on the wire, most of it was not involving my laptop.
For example: Server A VLAN 10=  Server B VLAN 20= and wireshark laptop is plugged into a trunk port which is allowing those vlan's. The vlan's are routable. is seeing the entire conversation when backs up even though it has no reason to see it. It is as if the trunk is spanning traffic to the laptop port. No span is setup however. It's really weird. This is not just broadcast traffic, but actual tcp taffic between Server A and B. Why would a trunk port see traffic between 2 other servers talking to each other on the vlan.
Trunk port configuration below:
Interface Ethernet 141/1/3 
switchport mode trunk
switchport trunk allowed vlan 10, 20

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Cisco Switching/Routing :: 6500 - Adding VLan To Trunk In Port Channel

Jan 20, 2012

I need adding a vlan to the trunks bundled in port channel. I know how to add v lans to a port channel with Cisco IOS but with CAT OS.

I have 2 ports bundled to form ether channel in switch which is running CAT OS. There are already few v lans allowed in the trunk of each interface. now I need to add one more v lan.

For Example:- 
v lan 135 needs to be added in addition to the existing v lans.
clear trunk1/2 1-112,115,117-134,136-4094
set trunk 1/2 on dot1q 113-114,116,135
and similarly on the 2nd interface
so if I add vlan135 to the trunk one after another will it cause any service disruption?

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Cisco Switching/Routing :: 3560x / Ethernet Trunk Port - What Is Hogging Bandwidth

Aug 15, 2012

I need to find out what is killing my Ethernet wan circuit urgently, It is a Ethernet trunk port with v lans tagged across it.
its a 3560x switch.
I configured span with the replicate keyword, but I'm not seeing all the traffic I'm sure.
I'm using wire shark.
Is there anything I can do to find what is causing this?

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Cisco Switching/Routing :: 3750 - Blocking Selected ARP Broadcasts From Particular Trunk Port Via DAI

May 17, 2012

We  had a core switch (Cisco 4503), distribution switches(Cisco 3750) and access switches in our  network and consists of many vlans. Almost all vlans uses DHCP Pools.  But for few vlans DHCP is not yet configured due to initial design poblems. Recently one of the rogue  user in vlan 1 connected to one of the access switch send rogue arp packets to the network (suspecting arp packet with interface vlan 1 ip of core switch with wrong mac-address (gateway ip of vlan 1)) and resulted in a prolonged network outage for the vlan 1.  Any way we are going to seggregate vlan 1 into different vlans, but  before that we need a temporary plan to block such kinds of attack like enabling DAI in the switch. I have checked the DAI implemenation feasibility with my knowledge and found that it is not possible to configure to the access switches(Cisco 2960) in which the user directly connected. But found that Distribution switch connected to that particular access switch seems to be able to configure since DAI commands are available to configure in switch.
Is it possible to block ARP packets with the interface vlan 1 IP Address with rogue mac-address by configuring DAI in the above mentioned Distribution switch and the port connected to the mentioned access switch?

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Cisco Switching/Routing :: SMG0641A041 - Tracing A Host Through Layers / Stuck At Trunk Port MAC?

Feb 15, 2012

I'm trying to trace a host and I'm getting stuck at the port channel mac addresses. I need to find out where the server is connected to and the switch it lives on.
Please read below:
Step 1) Log into the core (MSFC): Code...

How do I find out where this physical server lives? I keep getting the mac for the trunk ports which is being used for all VLANs.
The server is hanging off some switch but I need to track it down to the last end.

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Cisco Switching/Routing :: WCL2112 / Wireless LAN Controller Not Pingable When Plugged Into Trunk Port?

Aug 27, 2012

I have a Cisco Wireless LAN Controller WCL2112 model. It's currently plugged into an HP Procurve switch on a trunk port. That HP switch is plugged into my Cisco stack on a trunk port. I can reach the WCL just fine through the LAN. But when I plug the WCL directly into the Cisco stack on a trunk port, I can't reach the WCL at all, unless I connect to it over wireless. The interface shows it's conneccted and up/up. But no communications are sent across the line. I did a wireshark and can see only ARP request from the WCL. The trunk port on the stack is set to:
interface GigabitEthernet1/0/1
switchport trunk encapsulation dot1q
switchport mode trunk 
The WCL has 3 VLAN's on it and the SSID of VLAN 1 is our office wireless. If that matters. .The Cisco Stack is 4 switches. cisco WS-C3750X-48P

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Cisco Switching/Routing :: 3560 - What Happens When Voice Vlan Command Is Added To Trunk Port

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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Connect Wan Port Of Cable Modem To Lan Port Of Home Network?

Feb 26, 2012

is it possible to connect the wan port of a cable modem to a lan port of the home network? the reason is, i need some wifi access and more ports to my wired network, and the most reasonable solution would be a cable modem router with wifi and 4 ports just plugged into one of my routers.

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Home Network :: Port Forwarding Not Access Port

Jul 31, 2011

I want to create a Counter Strike Server and need to open some ports for that.The Problem: I cannot seem to open the ports for gaming.The Modem Setup: My Firewall is disabled.My guess is that, this is the area with the problem. I guess my modem is not forwarding onwards.The Problem: I tried checking my ports with websites like URL etc.It cannot access my port.

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