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 172.16.50.2 255.255.255.0!interface FastEthernet

[Code]....

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Cisco Switching/Routing :: Disable Administrative Native Vlan Tagging On 6509?

Dec 13, 2012

We have a problem with CDP packets on sent by our Cisco 6509's.  Unlike our other Cisco switches (4948G, 5020, etc.), the 6509 tags administrative traffic on the native vlan.  As a result the CDP packets are sent with an 802.1Q header with a tag of 1.  The other switches send the CDP packets untagged on the native vlan.  This causes problems because we have non-Cisco devices in our lab that also receive and send CDP, but they do not process the packets that are tagged by the 6509.  They see the packets from the 4948 and 5020 just fine.
 
How can I disable the administrative native vlan tagging on the 6509?  Here is the current setup:
 
nwkdev-6509-1#show vlan dot1q tag native
dot1q native vlan tagging is disabled globally
nwkdev-6509-1#show interfaces gigabitEthernet 1/9/1 switchport

[Code].....

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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 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 - Native Vlan1 Over Trunk

Jan 28, 2013

if i have this config:
switch port mode trunk
trunk aloved vlan 50
 
will travel over this trunk untagged packets? For eg the V LAN 1 is by default native V LAN without tag. If i have created a bog ring with catalyst 3560x switches with no spanning tree on V LAN 1 can be the case of this config a loop ???
I am using upper config on interfaces that are connected the switches  together in ring.
 
Other interfaces on switch have this config:  
int range 0/1-4
switchport mode acc
switchport acc vlan1
 
int range 0/5-24
switchport mode acc
switchport acc vlan50
 
I am using vlan1 just for local switching without connection to internet! I am asking just because i have this king of messages in logs:

%CDP-4-NATIVE_VLAN_MISMATCH: Native VLAN mismatch discovered on GigabitEthernet1/0/27 (1), with SW3560x_BR8874 GigabitEthernet1/0/19 (50).
 
GI 1/0/27 and GI 1/0/19 have this config:
switchport mode trunk
trunk aloved vlan 50

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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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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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Cisco Switches :: SG500 LACP Trunk Mismatch Native Vlan On Individual Ports

Jan 22, 2013

I have just configured up a sg500 with a lacp trunk to an upstream switch.
 
I am getting native vlan mismatch on the individual ports of the lacp team.
 
24-Jan-2013 12:54:48 %CDP-W-NATIVE_VLAN_MISMATCH: Native VLAN mismatch detected on interface gi1/1/24.
24-Jan-2013 12:57:35 %CDP-W-NATIVE_VLAN_MISMATCH: Native VLAN mismatch detected on interface gi1/1/48.

[Code].....

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Cisco Switching/Routing :: 6509 Vlan Flapping Between Port-channels

Mar 10, 2012

We have a pair Cisco 6509 switch in which 2 * 48 Port 1G line cards and 1 * 16 Port 10G line Card, FWSM and Sup 720 are installed.We have Cisco UCS and HP Blade servers.Cisco UCS servers are connected to Cisco 6509 switch using Fabric Interconnect, and HP Servers are directly connected to core switches.Recently the team made many changes in the network. Upgraded the IOS in Cisco 6509 switch, Configured Port profiling , MAC Pinning , HBA Cards to UCS / Nexus 1000V Infrastructure. After this change they lost the connectivity to UCS and HP Serers. Every tower is checking at their end.
 
The Network Team has reverted back the core switch with old IOS , but still the problem persisit.I could only see the following error log in the core switch. There are two port-channels one between core 1 and core 2. The other is between core switch and FWSM module. [code]

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Jan 14, 2013

I'm working at a company that has several 6509 switches running CatOS.  They have two of the 6509's running in vtp server mode and the rest as clients.  I set up a new vlan from one of the vtp servers and it propagated out.  The problem comes when I try to assign a port on one of the vtp clients to this new vlan.  It gives me an error that the switch must be in vtp server mode to add/delete vlans.  I'm not trying to add/or delete a vlan just trying to add a port into an existing vlan.  I'm hesitant to put the switch in vtp server mode.  Is this a CatOS thing or is there a specific command to accomplish this?             

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I'm trying to change a vlan on a port-channel but I am getting this error when I apply the change:" error: command is not mutually exclusive",I have done this in the past but I cannot remember exactly what I should type to apply the change.

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Feb 19, 2013

In our network environment, we have a 2960 switch sitting behind our router. Off of this we have a lot of external connections, like our external DNS, firewall, and VPN concentrators. I've configured a VLAN other than the default, moved everything into it and then shut VLAN 1. In this hardening guide it says that your native VLAN should be something other than the user VLAN, but if I am not using any trunk links, wouldn't I not really have a native VLAN? I attempted to make the link to our firewall a trunk link and then set the native VLAN to something else.

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Cisco Switching/Routing :: 6500 - Can Native VLan Or Duplex Mismatch

May 25, 2012

1 week ago, I got a call from a client that reported a network outage, the client told me that, 3 switch has crashed he try to console but it just hang. I ask him, did you change something? he said he didn't change anything, he just pluged a nortelswitch to the cisco switch number 9, but that switch doesn't crash like the others (3,4,8). I check the uptime, and yes the switch never been powered off..
 
   the topology look like this
 
              ____ 6500  ____
             /      /    |           
           1      2    3    4       5  ...... 9
 
 
the vlan is end to end vlan, so vlan span between all those switches. transparant. this is collapsed topology, core and distribution is the 6500 itself all of the 1-9 access switch are in the same rack, with no loopguard, and bpdu guard configured. and connected to the core using etherchannel. the problem is there is no log available to start the troubleshooting/investigation.

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SG-300 52 native VLAN blocking network packets

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Dec 22, 2012

I am having trouble after creating a management vlan (99) on a 3550 switch.I have configured the vlan (99) and given it an IP (192.168.1.100) and a default gateway (my router address - 192.168.1.99).I can ping to the switch from a PC and vice versa. The management VLAN IP is fine but now I cannot ping to the router from either the PC or the switch.It seems that just by adding VLAN 99 with it's own IP address has now prevented pings from the switch/ PC to the router ?Due to the fact that I have created a new switch management VLAN with an IP, does this mean I have set up the router as a 'router on a stick' scenario ? [code]

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Jan 4, 2012

We are trying to setup a new configuration with 2960S as access switchs and a 4507 as a core switch.I want to protect the management IP VLAN of the swich using vrf on the 4507 so we :
 
SHUT VLAN 1 on every switch (2960 + 4507)
CREATE A NEW VLAN 289 (management vlan) -> IP network : 10.32.126.192/26
L3 VLAN on every switch
VLAN 289 in the VRF XXX on the 4507
create tunk between the switch and the 4507 :
switch mode trunk allowed vlan 200-230
sw trunk native vlan 289 
 
so with this configuration on the 2960 the vlan 289 is UP/DOWN and UP/UP on the 4507 I can access to the 4507 using the IP in the VLAN 289 but i cannot access to the 2960 behind the 4507 CDP connectivity is ok?

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Oct 7, 2012

I am migrating an existing LAN from 3550 to 3750X-12S. In the existing configuation, I´ve got some trunks with native VLAN <> 1. The native VLAN is also used for user data transport. With IOS 15.0(1)SE3 on 3750X I recognized, that per default behavior PVST is not active for a VLAN defined as native, even if the corresponding trunk is up and trunking. My current workaround is to add a "switchport access vlan" command on the trunk even this one never should become an access port. With this statement only the switch is activating the PVST for the native VLAN. For all other vlans PVST works as exspected. [code]

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Jan 14, 2013

I've been experimenting with the 'vlan dot1q tag native' command on a switch and it seems as though tagging the native vlan breaks vty access to my access point.With the 'vlan dot1q tag native' commnand applied, I lose management connectivity to the AP with 'no vlan dot1q tag native' applied, connectivity is restored. Why is this? Is it safe to say that one can access the AP via vty lines using ONLY untagged packets? 
 
SWITCH
Model: WS-C3560G-24PS
Code: c3560-advipservicesk9-mz.122-46.SE
--Abbreviated CONF
 vlan dot1q tag native

[code]....

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Nov 2, 2011

I have connected a 2 TP trunk between 6509 and nx 7000, as shown above. I am trying to have speed 1000 on both sides.If I set speed 1000  on 6509 Trunk disconnect. How to force speed 1000? [code]

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Oct 25, 2011

I understand that jumbo frames need to be enabled end-to-end. I have two ESX hosts connected at each site. I want to enable jumbo frames for those ports, but what if not all host on the ESX are using jumbo frames, will I have drops and connection failures? So if i have two sites, each with a 6509 connected via a trunk and need to enable jumbo frames for a vlan between the sites how do I accomplish this?If I enable jumbo frames on the trunk link how does that impact other traffic between the sites?

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Cisco Switching/Routing :: 6509 Convert CatOS Configuration To Native IOS Configuration

Jul 17, 2012

I am position to migrate from CatOS 6509 switch to native IOS 6509 switch. long time ago, there was some site to convert automatically based on copy and paste onto the tool, but i can not find.
 
Does anybody know how to convert CatOS configuration to Native IOS configuration ? It is not IOS change, but it is configuration convert.

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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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Feb 11, 2013

I have 2 hosts, 1 plugged in fa 0/21 in VLAN 101 and another in fa 0/22 in VLAN 101 on our L2 Cisco 2960.  If I try and transfer files from either host the gig 0/1 trunk port on the 2960 leading tot he 3750 fa 0/1 port hits 100mb (using a real time bandwidth monitor tool), but why?  This VLAN is on the same switch, why does it go one way up the trunk to the L3 3750 switch?  The L3 3750 is the VTP server and the 2960 is a client.  I would of thought the traffic stays local.  The 2 hosts don't even have a gateway set.To sum up the typology the 2960 and 3750 are trunked using a single cable.  The 3750 hangs of a ASA firewall using SVIs.Here is whatthe traffic looks like when copying a file between hosts (2gb file).
 
3750 L3 Switch (VTP Server)
  interface FastEthernet1/0/4
description Trunk to Cisco 2960 Gig 0/1
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate

[code]....

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Sep 22, 2012

I need to set QOS in our new network. We have connected 2 cities together with 700Mbit leased line. On each side we have Catalyst 2960S switches and between them is TRUNK for VLAN 10 and Vlan 20.Vlan 10 is for IPTV (fixed 400 Mb/s for CATV)Vlan 20 is for Internet (rest).Sometimes is happening that Vlan 20 takes more than 400 Mb/s for a few seconds and in this situation we have problems with CATV.Is there any way to make a guaranteed bandwidth 410 Mb/s for CAT - VLAN 10  on this swithces?

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Jul 5, 2012

I have a 2960 switch connected to another. The I need to verify that vlan0010 on one switch is forwarding tagged traffic between the other switch it is hooked up to through the Gi0/1 port. How do I verify this? I have a server that's multihomed (Broadcom) on the other side an it is supposed to be on this vlan with one of it's network interfaces. We had a pwer outage and now it cannot communicate on this vlan. However, everything else on the vlan can reach all the other nodes accept this server in the front of my building. All the devices in the same room are linked to the same switch which has one port (fa0/17) on vlan0010 and can ping eachother just fine. The server is hooked to port 24 on my server room switch and Gigabit port one goes to a fiber converter all the way to the back. It then gets converted from fiber to cat5e again and links into the switch (2960) in the backroom.

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Cisco Switching/Routing :: QoS Limit Specific VLAN Within Trunk 4506

Jan 25, 2012

Need to limit the amount of bandwidth a specific VLAN can use on a 802.1q trunk port. Situation is that we have a pair of Catalyst 4506 switches which have 802.1q trunk ports into a Checkpoint Firewall, this in turn is connected to a managed WAN router (to which I can't apply a QoS policy).If the 4506 was routing the traffic it would be easy to setup a class-map to match the IP traffic and then QoS the traffic, but the VLAN in question is trunked directly into the firewall (no L3/IP presence on the 4506 next hop for all clients on this VLAN is the firewall).What I need to do is restrict any traffic from this specific VLAN to 10Mbps on the uplink to the Checkpoint Firewall so it cannot impact the onward WAN.

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a number of vlan on trunk is 4096, can I limit this number? I need trunk pass only 10 vlans.

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Cisco Switching/Routing :: 6513 To 3750 Vlan Trunk Connectivity

Nov 8, 2011

Currently we have a 6513 core (running IOS and doing limited routing) with VLAN Trunking to about a dozen 3560 edge switches, with various VLANs going to each of the edge switches.  All works well.  We are downsizing and replacing the 6513 core with a 3750G stack.  We have the stack up and running in the lab, and want to slowly (as we move floors) migrate all of the edge switching to the 3750 stack. 
 
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Sep 24, 2012

Current Situation:We are able to reach server IP -10.203.206.40  from our 4948 switch vlan 10.30.1.0/24 through the Layer 3 interface between 4506 and 4948.  
  
Requirements
==========
 
1) Now we would like to add one more L3 interface between 4506 & 4948 for redundancy purpose.
  
2) Make available Vlan 540 in 4948  from 4506... need to create two trunk links between 4506 & 4948 and allow vlan 540.

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