Adding & removing VLAN tags?

As I recall, switches will add the VLAN tag on frames entering a VLAN configured port & remove the tag once the frame exits the switch. Assuming VTP is enabled in a LAN topology because all VLAN members do not reside on the same switch, is the VLAN tag added & removed on *each* switch traversed?
Thanks for any clarification provided.

The tags are added and stripped on ingress and egress from access ports.
If a host sends a frame into a VLAN port on switch A, then the frames traverses a trunk port to switch B, then exits to a host from an access port on switch B, the TAG is applied on switch A, then stripped on switch B. THe frame keeps the tag through the trunk.
Good Luck
Scott

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[svn:fx-trunk] 5067: In preparation for adding ASDoc version tags for Flex, remove old tags from AIR files

Revision: 5067
Author: [email protected]
Date: 2009-02-25 08:21:22 -0800 (Wed, 25 Feb 2009)
Log Message:
In preparation for adding ASDoc version tags for Flex, remove old tags from AIR files
QE Notes: None
Doc Notes: None
Bugs: -
Modified Paths:
flex/sdk/trunk/frameworks/projects/airframework/src/mx/controls/FileSystemComboBox.as
flex/sdk/trunk/frameworks/projects/airframework/src/mx/controls/FileSystemDataGrid.as
flex/sdk/trunk/frameworks/projects/airframework/src/mx/controls/FileSystemEnumerationMode .as
flex/sdk/trunk/frameworks/projects/airframework/src/mx/controls/FileSystemHistoryButton.a s
flex/sdk/trunk/frameworks/projects/airframework/src/mx/controls/FileSystemList.as
flex/sdk/trunk/frameworks/projects/airframework/src/mx/controls/FileSystemSizeDisplayMode .as
flex/sdk/trunk/frameworks/projects/airframework/src/mx/controls/FileSystemTree.as
flex/sdk/trunk/frameworks/projects/airframework/src/mx/controls/FlexNativeMenu.as
flex/sdk/trunk/frameworks/projects/airframework/src/mx/controls/HTML.as
flex/sdk/trunk/frameworks/projects/airframework/src/mx/core/FlexHTMLLoader.as
flex/sdk/trunk/frameworks/projects/airframework/src/mx/core/IWindow.as
flex/sdk/trunk/frameworks/projects/airframework/src/mx/core/Window.as
flex/sdk/trunk/frameworks/projects/airframework/src/mx/core/WindowedApplication.as
flex/sdk/trunk/frameworks/projects/airframework/src/mx/core/windowClasses/StatusBar.as
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flex/sdk/trunk/frameworks/projects/airframework/src/mx/events/AIREvent.as
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I'm also having this problem. I'm using Flash Builder 4.6, AIR 3.4 and I've made a DLL (e.g. ExtensionDll.dll) which needs to call functions in another DLL (e.g. DllUsedByExtensionDll.dll) . I've made sure my ANE is working with the ExtensionDll.dll already, so there are no issues with my actionscript code or my ANE packaging or my DLL compilation. However, once I start calling functions from the other DLL, it starts throwing me Error #3500. Even if I call this function (e.g. abc()) in ExtensionDll.dll, but I never actually use the function from actionscript, and I call another function (e.g. def()) from actionscript, the Error #3500 still appears, so it does not seem to depened on the whether the code is used or not.
It's similar to this problem.
http://stackoverflow.com/questions/9823504/how-to-use-external-dll-in-air-native-extension
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Jumpstarting changes with U6: VLAN tagged interfaces and sysidcfg

Hello,
I've been banging my head on U6 for a few days and finally have to give up and cry for help. I can no longer build a jumpstarted server which ends up on a separate VLAN tagged LAN after first reboot.
I have an existing U5 SPARC jumpstart environment setup. We use VLAN tagging a lot in our environments and by default the only time a non VLAN tagged interface is used is during jumpstart. With the existing jumpstart we are using the following profiles:
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# /sbin/netstrategy
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thanks
Paul

Paul,
I don't want to suggest that I understand your problem but have you seen the comments about tagged vlans on the Opensolaris LDoms forum?
Near the bottom of thread [Solaris 10 10/08 (update 6)|http://www.opensolaris.org/jive/thread.jspa?threadID=81505&tstart=0] there is some discussion of tagged vlan support changes with U6.
It sounds like tagged vlans are going to be a problem with U6.
have a good weekend,
Glen

Mesh Ethernet Bridging with VLAN Tagging Issue

Hi all.
I'm a little stuck with a 4400 7.0.220.0 + RAP 1550 + MAP 1260 Ethernet bridging issue. I'm using the VLAN tagging functionality and I'm finding that periodically a VLAN that I've tagged on the MAP will deregister from the backhaul and stop passing traffic. If I go into the Mesh tab on the MAP, select the wired interface, remove the VLAN from the list of tagged VLAN IDs and then add it right back to the list, its starts passing traffic again.
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Justin

Hi Saravanan,
It is one RAP and three MAPs. After a TAC call and 30 hours of monitoring, my VLANs have remained registered. I think the issue was mismatched VLANs to bridge groups an it looks like the mesh bridge may be stable for now. Here is what I was seeing on the RAP and MAPs when the VLANs were deregistering unexpectedly. Notice how VLANs 2 and 10 are mapped to opposite bridge groups on the RAP and MAP:
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Thanks for the response!
Justin

[svn:fx-4.x] 14456: Adding ASDoc version tags classes

Revision: 14456
Revision: 14456
Author:   [email protected]
Date:     2010-02-26 07:45:53 -0800 (Fri, 26 Feb 2010)
Log Message:
Adding ASDoc version tags classes
QE notes:
Doc notes:
Bugs:
Reviewer:
Tests run: checkintests
Is noteworthy for integration: no
Modified Paths:
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Span & wireshark to see p-bits and vlan tags

Problem:
I do not see 802.1Q tags nor do I see p-bits (COS) in my wireshark captures. My setup is not working and I have no way to verify (sniff) that the 6509 is setting the p-bits to 3. I need to see them to troubleshoot effectively. Help!
Setup:
I am port mirroring off of my 6509. Port 1/16 should be tagging and setting the p-bits to a value of 3. How can I confirm?
interface GigabitEthernet1/16
description DonkX
no ip address
load-interval 30
mls qos cos 3       ! I've tried my tests with and without this command
mls qos cos trust      ! I've tried my tests with and without this command
switchport
switchport access vlan 941
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 941
switchport mode trunk
no cdp enable
end
sho mon
Session 1
Type                   : Local Session
Source Ports           :
    Both               : Gi1/16
Destination Ports      : Gi8/47
Port G1/16 is the GE uplink to DonkX
Port G8/47 is the Windows 2003 Server with wireshark.
Port G8/9 is my RH4 Linux box with TCPdump.
Steps taken to resolve the problem:
I have followed this document to set this up correctly on my windows box with a Intel Proset 1000MT. I have updated the drivers and made the registry changes with no captures showing tagging/cos information.
http://www.intel.com/support/network/sb/CS-005897.htm
Regardless of my settings, this document says I shouldn't have to worry about drivers:
http://wiki.wireshark.org/CaptureSetup/VLAN
"You'll definitely see the VLAN tags, regardless of what OS the independent system is running or what type of network adapter you're using."
Details:
I am testing a new GPON access product (DonkX) that uplinks via GigE using trunking and setting p-bits. To prioritize my video the new DonkX sets the p-bits to 3 and it instantly ceases that traffic. I have only unidirectional traffic at this point so I can no longer arp, icmp, ftp, tftp, noth'n. The 6509 sends back a response to DonkX but I believe it is dropped because the p-bit is not set to 3. If I remove the priority from 3 to 0 on the DonkX system then it works correctly but without QoS of course.
-JGR

Alright, the saga continues. I saw tagged frames last week but began troubleshooting again this morning and can't see tagged frames!
If I remove the span then I can see tagged traffic on g8/47 (Windows 2003 Server 802.1q not configured on NIC). If I turn on monitoring I see no tagged traffic. I also tried this on a laptop running Fedora 12 (on g8/47) and had the same results. Any ideas?
I've mirrored another trunk port that is in production passing tagged traffic to an 3560 trunked and going to an ASA. The port to the 3560 and ASA (g3/7) requires tagging and works properly; however, I cannot see tags on this port either. Do you see anything obvious here or is this looking like a tac case?
interface GigabitEthernet1/16
description DonkX
no ip address
load-interval 30
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 941
switchport mode trunk
no cdp enable
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interface GigabitEthernet8/47
no ip address
switchport
switchport trunk encapsulation dot1q
switchport mode trunk
no cdp enable
end
conf t
no mon sess 1
mon sess 1 sourc int g1/16
mon sess 1 dest int g8/47
sho mon
Session 1
Type                   : Local Session
Source Ports           :
    Both               : Gi1/16
Destination Ports      : Gi8/47
Unit details:
WS-C6509 Version 12.2(18)SXD4
NAME: "1", DESCR: "WS-X6516A-GBIC SFM-capable 16 port 1000mb GBIC Rev. 4.2"
PID: WS-X6516A-GBIC
NAME: "8", DESCR: "WS-X6748-GE-TX CEF720 48 port 10/100/1000mb Ethernet Rev. 2.3"
PID: WS-X6748-GE-TX
NAME: "6", DESCR: "WS-SUP720-BASE 2 ports Supervisor Engine 720 Rev. 3.1"
PID: WS-SUP720-BASE
NAME: "msfc sub-module of 6", DESCR: "WS-SUP720 MSFC3 Daughterboard Rev. 2.3"
PID: WS-SUP720
NAME: "switching engine sub-module of 6", DESCR: "WS-F6K-PFC3A Policy Feature Card 3 Rev. 2.4"
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Collision Domain , Vlan Tagging.

Hi,
Can any one tell me please do we have collisions in a Switch if yes 1. how to avoid Collisions in a switch and 2. Define Vlan Tagging. Can anyone please answer my two questions.
Thanks.

Hi,
1) each port on a switch is a collision domain this is called microsegmentation and you can run full-duplex so the answer is No there are no more collisions in a switched network. apart from shared segment where there is a hub or AP attached
2)on links where multiple VLANS can travel you must have a way of differentiating the VLAN the frame is part of and so you have a field with the VLAN id which is a Tag permitting to recognize the VLAN so the switch knows on which port it can forward the frame when the tag is removed.So a frame enters a port belonging to a particuliar vlan and it is tagged with the vlan id when traversing the trunk( or tagged port) and untagged when forwarded to the destination.
In 802.1Q ther is also the concept of native vlan : frames from this vlan will have no tag, this is a compatibility feature for devices not VLAN aware.
Regards.
Alain.

Native VLAN tagging work-around?

Good Day!
Story here is that I am upgrading my 6500 Metro Ethernet core switch from CatOS to IOS and implementing several security components - one in question is implementing 'vlan dot1q tag native' global command on core switch. Most of my PE switches are 3550 series and are compatible with this configuration. The problem is that I also have several remote legacy 3508G switches that I need to support, and they will not accept this command.
Is anyone aware of a work-around config for these 3508s? So far have not found any help on CCO...
Thanks!

Don't know if you can do this on a Cat6500 running IOS, but here's my idea:
Set the native VLAN on the 3508G end of the 802.1Q trunk to a VLAN that is not going to be used anywhere for access, and match the native VLAN specification on your 6500's corresponding interface. Then, remove that VLAN from the trunk at both ends.
The way I read it, on the 6500 the "vlan dot1q tag native" command would tag outgoing traffic on the native VLAN; and would drop all incoming traffic on the native VLAN that wasn't tagged. But none of that will matter, because removing that one VLAN from the allowed VLAN list on the trunk will leave you with only tagged VLAN traffic on the trunk from the 3508G. CDP will see that the native VLAN is set the same at each end (if you use CDP), so it won't flag any mismatches there. You just won't use the native VLAN on the trunk.
I'm doing something similar with CatOS on a 6509 and 2950G access switches. Setting native VLAN to 1 (the default) on both ends, which makes it untagged; and then removing VLAN 1 from the trunk on both sides, leaving me with only tagged traffic on the trunk.
Now, VLAN 1 is a special case, you can't remove it completely from the allowed VLAN list on a 2950G. The documentation refers to it as "minimizing" VLAN 1: CDP and VTP traffic will still pass over it, as will a couple of other Cisco-centric things; but no user traffic, and no STP BPDUs. Testing it today, I verified the CDP and VTP traffic work in both directions after I cleared VLAN 1 from the trunk and had only one customer VLAN, tagged, on it.
In your situation, you can't remove VLAN 1 at all from a 3508G XL trunk. So just pick another VLAN to throw away as the native VLAN that you remove from the trunk, and transmit VLAN1 tagged across it.
I think DTP uses the native VLAN; so the only drawback to my idea is that you have to manually set the trunk mode rather than letting the switches negotiate it out. (No problem for me, I set them all manually anyway.)
Hope this helps.

(Another) Native VLAN tagging question..

I have completed CCNA 3 course and am in 4 right now. I am still confused about VLAN native commands such as
sw tr na vl xxx
When this is on a trunk port, what does it mean?
Thanks....

"So does that mean that before the packet goes onto the trunk link it is put into the native VLAN then when it exits the trunk link (on the other side) it is stripped of the VLAN info? "
No, what your prior quotation decribed is what a switch should do with untagged frames received on a port defined as a VLAN trunk.
The VLAN tags informs the switch what VLAN a frames belongs to when it is received on a VLAN trunk port, but without such a tag, how does the switch know the intended VLAN? It doesn't, from the frame itself. So, we can often configure a trunk port to place any untagged frames into one VLAN of our choice. In theory, once we define what VLAN untagged frames will be considered a member of, tagged frames, for that VLAN could also be accepted. Both should be treated the same by the receiving switch.
As for a switch sending packets out a VLAN trunk, normally you would expect all packets to be VLAN tagged although a switch might support sending one particular VLAN frames without tags to support a device, such as the PC described in your quotation, that doesn't understand how to process, or expect, tagged frames.
If you're wondering how this all comes to be, consider a PC that knows nothing about VLAN tags is connected to an IP phone which does (which connects to the network) and you want to place the two devices on different VLANs. As the PC traffic transits the phone could, in theory, wrap/unwrap the PC traffic with VLANs tags when working with the network switch. However, if the phone fails, you can design the IP phone hardware to keep the link good from PC to the network, but then the IP phone PC VLAN processing would be lost. So for that reason, and the reason, we might want to add/remove an IP phone "in front" of the PC, we want to continue to support untagged frames to/from the PC.
Altough the frames to the PC are untagged, since we can configure what VLAN untagged frame should be considered per port, we can have different PCs (on different ports) in different VLANs on the switch. (This is very similar to port based VLANs, but instead of being limited to one logical VLAN per port, we're limited to one untagged VLAN per port but can have multiple tagged VLANs per port.)

VLAN Tagging on vnic

Hi there,
this is my first experience with cisco UCS and I have some problems about vlan tagging and trunking concepts implementation.
VLAN trunking: actually works; I declared all vlans on the dynamic vnic and it looks ok, so, the profiles for vmware are working
VLAN tagging: I don't understand how to do it; in a previous version of the ucs gui, in the vNIC creation, there was the VLAN trunking Yes or No selection that allowed (I think) to simply tag a VLAN on the vnic. I need to tag the VLAN on a vNIC for the baremetal installations.
Do you have any idea?
Thank you
Claudio

Hi Claudio
This question vlan trunking yes or no was indeed weird; the internal implementation of UCS uses always trunking, therefore this question doesn't make sense, and was removed.
If your OS can handle a vlan trunk on a vnic, just select all the vlans you need.
If you have a OS with lots of vnics, with only one vlan per vnic, you tag them as native (therefore no tagging). Your OS is not configured for vlan trunking.
Cheers Walter.

Is there a way of adding a b tag in Muse

Is there a way of adding a tag to your muse without the styling being done in a style sheet - For seo purposes I think it is better that the tag is placed in the HTML

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Adding alt text tags in InDesign (and Acrobat Pro)

I am having real difficulty adding alternative text tags. I created an INDD doc with rollover buttons linked to URLs firstly in InDesign CS4. I couldn't add alt text tags in CS4 so I then tried to add them in Acrobat X Pro but failed. Acrobat keeps wanting to class the PDF as a form. I then installed InDesign CS6 from the cloud and added alt text to the rollover buttons via object export options. However, these do not show when I export to PDF.
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In InDesign CS6, you just need to add descriptions to buttons. This is done in the buttons and forms panel:
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Remove XML tags from XML element in Oracle

Hi,
I have a requirement where I have to remove all the xml tags from xml element with banks, currently I'm using replace 4 times to replace all different types of xml tags, performance is really bad. is there any better option to remove xml tags from xml data leaving the actual data. please find the example data below.
select
TO_CLOB(REPLACE(REPLACE(REPLACE(REPLACE
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from dual
**************Out put*************
MyText Data goes here ;Data agian

One way is to use xquery:
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select xmlquery('string-join(//text(), ";")' passing xml returning content).getclobval() xml from t
XML
MyText Data goes here ;Data agian
1 row selected.

Vlan tag issue with Nexus 4001 in IBM Blade Centre

Hi
I have a DC architecture with a pair of Nexus 7010's running 3 VDC's (Core/Aggregation/Enterprise). I have at the edge Nexus 5548's which connect to back to the Aggregation VDC. Also connecting back to the Aggregation VDC is an IBM Blade Chassis which has a Nexus 4001i in slots 7 and slot 9. These blade servers are running ESXi 4.0 and are mapped to the Nexus 4001 blade switch.
I had set up the Native VLAN as VLAN 999 which connects up to the ESXi host and I am trunking up multiple VLANS for the Virtual Machines.
The problem I have is that VM's in all VLANS except the ESXi host VLAN (VLAN 10) cannot see their default gateway, and I suspect that there is an issue with the VLAN tag going up to the ESXi host. I have read enough documentation to suggest that this is where the issue is.
My Nexus 4001 interface configuration is below
interface Ethernet1/1
switchport mode trunk
switchport trunk native vlan 999
switchport trunk allowed vlan 10,30,40-41,60-62,90,96,999
spanning-tree port type edge trunk
speed auto
The Aggregation VDC on the Nexus 7010 is the default gateway for all these VLANS.
I also noted that the Nexus 5000 and Nexus 7000 supports the command vlan dot1q tag native command yet the Nexus 4000 doesn't seem to support this. Any assistance would be useful
Thanks
Greg

Your configuration on the N4K looks correct. You shouldn't use vlan dot1q tag native commands on your N7Ks and N5Ks. Native VLAN tagging is really for QinQ (dot1q tunneling).
My only suggestion is check your configuration of the vSwitch in the ESXi host and the host network profile.
Regards,
jerry

Problem removing html tags from the text retrived

Hi there,
I am using jdbc to connect the database and retriving the data. In one of the columns along with the description there are some html tags in few of the recors of that column. is there a way to retrive the text only ignoring the html tags in between. Or can i retrive and then strip off the html code in the text to display only normal text.
example of the data retrived which are pipe seperated and one of the columns has html tags in it:
209|The euphoria |187945-2|http://www.abc/lst.jsp?mktgChannel=I86023&sku=18791-2&siteID=qpF0HYnRugA|http://www.abc.com/assets/images/product/medium/18793-2_198.jpg|Rooftop Singers: Walk Right In | abc Music proudly presents THE FOLK YEARS, an unforgettable era in music history! Featuring: 
<LI>The most complete collection of folk and folk-rock songs ever put together -- 132 classics!
<LI>Original hits by the original artists!
Now i need to remove the tags before displaying this on the output. Is there a simple way to do this.
Thanks...

Did you read the documentation of the trim() method,
where it describes which whitespace it removes?I believe his problem is that
"Some text here
<blah>
More text"becomes
"Some text here
More text"... and he wants ...
"Some text here
More text"So, your problem is that your regex isn't matching whitespace as well.
See the "Trimming Whitespace" section:
http://www.regular-expressions.info/examples.html

Adding & removing VLAN tags?

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