Port aggregation over 2 or more switches?

I am currently using a HP1910 48 Port with Port Aggregation.
Is it possible to use this feature over 2 or more of these switches so that If one switch fails the other automatically comes into play?
Many than

Hi:
You may also want to post your question on the HP Business Support Forum -- Web and Unmanaged Switching section.
http://h30499.www3.hp.com/t5/Web-and-Unmanaged/bd-p/switching-v-series-forum#.VNN-33k5C9I

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Port aggregation on different switches?

Hello all :)
I got a server PC with two fast ethernet NICs (NICS do support port aggregation)
I know you can connect two 100 Mbps ports of server to two fast ethernet ports of a switch, this way you get one 200 Mbps link. If one of the ports or one of the links fail, other link keeps working.
this is a vey nice redundancy.
My question is;
is it possible to bundle two fast ethernet ports of server to two different switches? (first ethernet port of PC to switch 1 and second ethernet port of PC to switch 2. switch 1 and switch 2 are connected each other with an uplink)
if possible, what is the CLI command for that?
thank you very much for helping.

Hello,
AFAIK, and unless something has changed very recently, the only way to link two (or more) switches together in a single Etherchannel is in a stack configuration.
Nortel appears to have a feature called Split MultiLink Trunking, which does multichassis trunking, you might want to have a look at the document below:
Layer 2 Trunking Availability Strategies using SMLT and DMLT
http://www.informit.com/articles/article.asp?p=169544&seqNum=3&rl=1
Regards,
GP

Ether Channel (port aggregation)

No matter LACP or PAgP is used, is it possible to do port aggregation on a Server with NIC 1 & NIC2 respectively connecting to different Switches which are then having the same uplink to higher level?
as follows : -
Server NIC # 1 ------ Switch #A ----\
---- LAN
NIC # 2 -------Switch # B ---/
My understanding is that it cannot, can it ?
Rgds,
Raymond.

THanks, that's what i'd been understanding, yet, someone else post me this answer, Quote,
For your case, the LAN switches won't care how you send out the packet, it just treat the two NICs as two NICs, your server need to deal with the packet/session aggregation. It works because we suppose your server don't have any STP issues.
Kind Regards,
Bong So
Professional Services, Equant HK
UNQuote
I shall test ... the actual case is happening with our being installed IBM BladeCenter Server, having the NIC1 and NIC2 internally wired to CIGESM switch 1 and 2; and the NIC's are Broadcom capable of using Virtual adapters in either modes, one which is LACP.
Thanks again.
Raymond.

I swtiched from LabView7 to LabView8.2, and now my parallel port on LPT1 is not more recognised (I am not able to use VISA to write on it). Why?

I switched from LabView7 to LabView8.2, and now my parallel port on LPT1 is not more recognised (I am not able to use VISA to write on it). Why?

Hi,
Sorry for the delay,
I need to know more informations about your problem. Have you check the configuration of LPT in MAX? Can you open a VISA session? Do you receive a timeout error when you try to write on that port?
You can find same importants informations about parallel port configuration for different versions of LabVIEW at this link:
http://digital.ni.com/public.nsf/websearch/E6415E8A8376F63D86256C46007592E8?OpenDocument
Let's me know.
Riccardo

Im having trouble connecting my macbookpro to the tv. im using a mini display port to hdmi adapter, when i switch tv/video to hdmi on the tv nothing pops up, and i dont have the arrangement tap on the display settings, please help!

im having trouble connecting my macbookpro to the tv. im using a mini display port to hdmi adapter, when i switch tv/video to hdmi on the tv nothing pops up, and i dont have the arrangement tap on the display settings, please help!

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Can't open a pdf document over two or more junction points

Hello,
if i open a pdf document that's stored in a directory and this directiry is accessable over two or mor junction points, it will be fail. The message say something abount access denied, but the security is set to full access. In other application (e.g. notepad.exe) i can access this document. Then i tested it with one junction point and it works.
So here is a szenario to test:
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I can normaly access the file at C:\Folder3\PDF-Document.pdf but not with Acrobat Reader! In Notepad i can open the pdf document.
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Thanks und Greetings
Martin

It's possible it's a bug, or it may be a limitation in the software if it's a specialized kind of PDF that Reader for iOS doesn't support.
In any case, posting a link to the file would provide the engineers with some information to help fix the problem.
Keep in mind that the software for mobile devices has been in development a much shorter time than software for computers (Reader for Windows or Macintosh).

Issues with iCloud synchronisation and contacts over two or more devices. iTouch and iPad2 sync with different results from iMac. Thoughts?

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To follow-up with this issue:
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I contacted support, and the rep told me that OS 10 has an issue with memo sync and it can cause all sorts of unpredictable behavior. Now, whether or not this is accurate I can say this: So far, the device is not disconnecting and reconnecting like it was before. Problem is, is this a result of not enabling memo sync, or is this a result of the security wipe?
I may have overlooked it, but I don't recall reading anything about that anywhere else. I'm tempted to try re-enabling the memo sync to see if everything blows up again. At least that way I can see for myself if the memo sync is a real issue. Of course, perhaps it's an issue with SherWeb (our host) specifically. Hm...
Anyway, for those that were interested, and for those that may come along in the future with a similar situation, the strange behavior that I first reported is no longer happening. I just don't know if it was a result of a security wipe or a result of not enabling memo sync with Exchange.
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UCCX8 Is there a log or report that shows IVR/CTI port availability over time

Question:
Is there a log or report that shows IVR/CTI port availability over time?
Objective:
We are trying to determine if, when doing a Call Redirect step, the IVR/CTI port stays the same or the port is made available by the first script and the second script, where the Call Redirect is redirecting to, has to reserve its own IVR/CTI port.
What we have done already:
We limited the Call Control Group to 1 CTI port and ran the scripts that do the Call Redirect step and it worked fine, so we are assuming that there is not a point where the transfer takes up two IVR/CTI ports at the same time.
-Lauren

Hi,
if it's UCCE, then if I remember that correctly, there is a webview report that would tell you Network Trunk Group utilization. Or, actually, you can extract this information yourself from the HDS table named Trunk_Group_Half_Hour.
G.

EtherChannel & Port Aggregation different ?!?

hi frens,
i quite confuse in the EtherChannel & Port Aggregation technology... and how they related in perform load balancing ??
Thanks
William

Hi William,
Etherchannel and Port Aggregation are two terms that mean the same thing. Etherchannel is 'Cisco terminology' and Port Aggregation and link bundling are generic terms.
HTH,
Bobby

CSS 11500 Port Aggregation

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Thanks,
Patrick

The CSS does not support EtherChannel.
~Zach

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Since upgrading to IOS 5 the address book only takes over 277 of more than 400 addresses on my notebook - any suggestions why?

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How to get info over snmp on cisco switch whether native vlan on a port is tagged or not?

Hi!
I want to know which oid(s) should I query to know whether native vlan on trunk port on cisco switch is tagged or not?
I am querying the oid .1.3.6.1.4.1.9.9.46.1.6.3.0 (vlanTrunkPortsDot1qTag) on cisco 3560 (E Series) and I am getting global value. Also, this OID is showing as deprecated. So I query .1.3.6.1.4.1.9.9.246.1.6 (cltcDot1qAllTagged) and its subtree, but no value is returned.
Switch Version is
Cisco IOS Software, C3560E Software (C3560E-UNIVERSALK9-M), Version 12.2(50)SE2

Keep in mind that DHCP is a broadcast packet to start. So the AP can only listen in the subnet that it has an IP address for.
Now, for any other subnet you can use the AP for DHCP but you have to have an IP helper address on your L3 pointing back to the AP.
That being said, I wouldn't use the DHCP server on the AP as it is limited. You'd be better off using a Microsoft server or some other device that is designed for DHCP.
HTH,
Steve

Port Channel over L2 MPLS links

Hello.
I was hoping that someone could over some suggestions on best practice or recommendations for configuring port channel to bundle to layer 2 MPLS links that we have.
We have racks in two geographically separated data centres, each rack has a stack of Cisco 3850 switches, and there are two 100Mbps layer 2 connections linking these stacks together. The links are provided by our supplier and runs over their core network (I can get more info on their setup if need be).
I had initially just configured a simple port channel bundling the two ports on "Switch A", and the same on "Switch B". However I have since noticed that one of the ports was put into error disabled state, and I have my doubts that we ever had 200Mbps throughput over the portchannel.
The logs showed:
UDLD-4-UDLD_PORT_DISABLED: UDLD disabled interface Gix/x/x, aggressive mode failure detected
%PM-4-ERR_DISABLE: udld error detected on Gix/x/x, putting Gix/x/x in err-disable state
How I understand is that one of ports recieved an unexpected (or incorrect) BPDU packet, and shut the port down as part of spanning tree process to stop a loop forming.
For the time being I have removed the port channel config and re-opened all the ports, so I believe one of the ports is now in blocking state.
Whilst redundancy for these links is great, ideally I would like to have the links bundled so I also get the benefit of higher throughput.
Any thoughts are greatly appreciated.
Thank you

Hi,
Thank you for your reply and suggestions. I have been reading up on layer 2 protocol tunnelling and I'm not sure if this will work for us. According to these guidelines for the catalyst 3550 (http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3550/software/release/12-1_19_ea1/configuration/guide/3550scg/swtunnel.html#wp1006657) it states:
•If you enable PAgP or LACP tunneling, we recommend that you also enable UDLD on the interface for faster link-failure detection.
•Tunneling is not supported on trunk ports. If you enter the l2protocol-tunnel interface configuration command on a trunk port, the command is accepted, but Layer 2 tunneling does not take affect unless you change the port to a tunnel port or an access port.
•EtherChannel port groups are compatible with tunnel ports when the 802.1Q configuration is consistent within an EtherChannel port group.
(maybe its a different and is supported on 3850's)
Also, I cant use layer 3 over this link as I am looking to extend VLANs over the link so devices and virtual machines in each of the datacentre are in the same subnet and broadcast domain.
I will speak with the supplier to see what they are willing to do.
Thanks again.

802.1x per host authentication under one port with multi-host access by switch

In the situation with multi-host access to one port of Cisco 2960 Lan Lite by another simple L2 switch, is it possible that we could control per user access by authentication for each?
What happens if I connect to the switch (which already has some trusted devices) a untrusted device?
What happens if I connect to the switch (which already has some untrusted device) a trusted device?
If I use "authentication violation protect" traffic will be blocked only by an untrusted device or all devices connected via a simple L2 switch?
I read the manual, but it is not made detailed clarity.
Please tell me the right way.
I will be very grateful for your advice!

Hello,
In the situation with multi-host access to one port of Cisco 2960 Lan Lite by another simple L2 switch, is it possible that we could control per user access by authentication for each?
Yes, that's why multi-host mode exists
What happens if I connect to the switch (which already has some trusted devices) a untrusted device? If it's on single host the port will go into error-disabled as the violation of just one client per port has been triggered.
What happens if I connect to the switch (which already has some untrusted device) a trusted device?Same thing than before if being on single mode.
If I use "authentication violation protect" traffic will be blocked only by an untrusted device or all devices connected via a simple L2 switch?
Only for the unknown client MAC address, the trusted devices will be able to comunicate.
For more information about Core and Security Networking follow my website at http://laguiadelnetworking.
Any question contact me at [email protected]
Cheers,
Julio Carvajal Segura

Port aggregation over 2 or more switches?

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