Box-to-box redundancy over DWDM

Is possible to use box-to-box redundancy, when the connectivity between CSSs (for APP) is provided by using DWDM technology??
CSS - ONS - ONS - CSS.
Thank you.

officially not supported but it works most of the time.
Gilles.

Similar Messages

How to persuade the carriers choose the solution of IP over DWDM?

Hi,every one.
why IP over DWDM(15454) is the correct choice for carrier class service?
why the router can instead of SDH/OCS?
Except of save the client interface between DWDM and Router, What other advantages?
Best regard!

1. SDH can also provide you carrier class service, IP over DWDM is right choice if you have too many wavelengths from one point to another (not sub wavelength). You reduce your cost as removing layers.
SDH is right choice when you need subwavelngth kind of capacity between nodes as DWDM crossconnect are not as good as SDH crossconnect.
2. Why router because you are removing the SDH layer.
3. Apart from saving SDH boxes IP over DWDM also will be less complex in troubleshooting. If your router is working fine then problem is in DWDM layer. If you have IP/SDH/DWDM then it is comples to isolate problem.
I think IP over DWDM are still in early stages as is rigid kind of network even with today WXC. Need a totally different kind of wavelength crossconnect to see all the benfits of IP over DWDM.

How to implement long-distance box-box Redundant for CSS product?

I want to config box-box redundancy for CSS,but It's about 1200+ meters from one to the other,
so it couldn't implement using crossover UTP cable.
(DOes it work well when link with Fiber optical transceiver between the two Content Switches ?)
or
Would you pls. give your solution for this ?
Thanks,
thomas

As far as my knowledge goes I think cross over cable is the only option.When the CSS are too far apart, Box-to-Box
redundancy cannot be used.A gige-cable cannot be used for failover.
Have a look at this:
http://www.cisco.com/univercd/cc/td/doc/product/webscale/css/advcfggd/redndncy.htm#xtocid145103

Quirkiness with box to box redundancy.

I have several sets of CSS's running in box to box redundancy running version 5.03 Build 15.
My question is what causes one CSS to out of the blue go backup and the other become master? I've had this happen on just about all the ones I have configured for box to box. This one pair has been running for a little over a year without a problem and today failed over to the other CSS twice. Nothing shows up in the logs except the "transition to redundancy backup / master." Another pair did this several times about a year ago, after having ran for quite some time. I rebooted both units and they were fine for a period of about 6 months. I find this very strange and am curious if anyone else has had these same problems. I have updated the code on one set, the problem reappered about 7 months later.
I'm now deploying all new CSS installs using interface/vip redundancy.
Thanks!

the version you are using is a potential explanation.
I would really not recommend it.
You should either go to 5.0 or 6.10
Regarding the problem you got, it could also be related to how you connected the CSS together.
Do you have a straight connection between the 2 ? or do you use a switch ?
If a switch, something could have happened there.
Gilles.

CSS Box to Box - Redundancy

We have two CSS running in box to box redundancy in two-arm (router mode) on code 8.10.40. Master is running with ip redundancy master (causing it to always be master if it is up and running).
We had a need to reload a previous configuration. To do this I copied the configuration to startup-config under running boot-file. I then ran command copy start run (on the master). After doing so, we lost all VIPs, although servers on second arm of CSS were accesible as well as the interface on the same network as the VIPs.
There is a 6509 switch between our CSS and the Firewall (firewall's are running in same mode - box to box). Firewall team saw traffic destined for the VIPs leave their interface, but we never saw it hit the CSS. I think that we had an ARP issue, but nobody can attest to this 100%. We had to reboot both CSS's to get VIPs to respond properly.
What would be the normal expectations in this scenario?
What is best practice to reload a configuration?

the copy start run does not erase the running config. So, it tries to add whatever config you had in startup on top of the running config.
Personally I would have simply done a reload once the config was in startup.
Gilles.

There is a frequent flashing above my tool bar and sometimes a flashing black box appears over my Yahoo news. How do I make it Stop??b

There is a bright flashing light over my tool bar and sometimes a flashing black box appears over the Yahoo news. I tried Reset Firefox and that didn't work. I then uninstalled and re-installed Firefox and I still have the seizure inducing flashing lights.
When I switch to Internet Explorer I do NOT have this problem. Please help me because I do not want to go back to IE.
Thanks

In case this is caused by Firefox 33 being incompatible with your graphics card/chipset driver software, could you test for a while in Firefox's Safe Mode? That's a standard diagnostic tool to deactivate extensions, hardware acceleration, and some other advanced features of Firefox. More info: [[Troubleshoot Firefox issues using Safe Mode]].
You can restart Firefox in Safe Mode using either:
* "3-bar" menu button > "?" button > Restart with Add-ons Disabled
* Help menu > Restart with Add-ons Disabled
Not all add-ons are disabled: Flash and other plugins still run
After Firefox shuts down, a small dialog should appear. Click "Start in Safe Mode" (''not'' Reset).
Any difference?
You can disable hardware acceleration for all modes in the Options dialog.
"3-bar" menu button (or Tools menu) > Options > Advanced
On the "General" mini-tab, uncheck the box for "Use hardware acceleration when available"
This takes effect the next time you exit Firefox and start it up again.

Software upgrade on box-to-box redundant CSS's

I am planning a software upgrade from version 5.00 Build 63 to version 6.1 on a pair of CSS 11150 devices running box-to-box redundancy.
Should both devices be upgraded at the same time, or can I split them and upgrade on consecutive weekends ?

if it was 2 different 5.0 release, I would say ok.
But a 5.0 and a 6.1 release, it could be ok but that's not 100% sure.
Sorry, that's all I can say.
Maybe you could put both images on the CSS, boot the CSS out of 6.1 and configure them to reboot with 5.0 in case something wrong happens.
Gilles.

CSS box to box redundancy redundant link

Hello,
Does CSS 15001 with firmware version sg0820001 (08.20.0.01) require gigabit link for box to box redundancy's redundant link?
Thank's
Raymond.

The crossover cable used for the redundant link can be connected to two Gigabit Ethernet or two Fast Ethernet ports.
See:
http://www.cisco.com/en/US/docs/app_ntwk_services/data_center_app_services/css11500series/v8.20_v8.10/configuration/redundancy/guide/Redndncy.html#wp1060803

GE redundancy through fibre for box-to-box redundancy

According to Cisco documentation, you need to use crossover cable to connect master and redundant CSS for box-to-box redundancy. May I know whether the fibre can be used instead of crossover cable? And how about the ISC link for ASR? Can I use fibre also?

Gilles,
CSS Redundancy Configuration Guide (Software Version 7.30) said that:
Use the redundancy-l4-stateless command in content or group configuration mode to enable stateless redundancy failover in a box-to-box redundancy or a VIP and virtual interface redundancy configuration. Stateless redundancy failover allows critical TCP/IP traffic to continue in case of a failure at the load-balancing CSS by allowing the backup CSS to set up a mid-stream TCP flow. This feature is disabled by default.
The default behavior of a CSS is to set up load-balanced TCP flows only when it receives a TCP frame that begins with SYN. When stateless redundancy failover is enabled and a failover occurs, the backup CSS establishes a mid-stream flow for any existing TCP sessions. The CSS still exhibits the default behavior for all new flows. To restore the default behavior of the CSS for all flows after issuing the redundancy-l4-stateless command, use the no redundancy-l4-stateless command.
Does this mean that client does not need to reestablish connection to server after failover?
Thanks
Deng Qi

Box-to-box redundancy

I´m a little bit confused about the config guide ragarding box-to-box redundancy.
customer will use 2 Css 11503 and wants to configure box-to-box redundancy.
There is one advice that it is essary to link the two switches via a FE-Port. but i also fond an advice that a GE-Port can be used.
What is right? It´s depending on sw-version ?
Thank you for your help
regards
Dietrich Schleyer

Dietrich,
initially it was necessary for this link to be FE.
With the most recent versions this link can also be a GE link.
Since this link is only being used for some kind of keepalive between the 2 CSS, I don't see the need to use GigE.
Also, unless your customer is doing firewall loadbalancing, you should really convince him to use vip/interface redundancy and not box-to-box redundancy.
You get faster failover time with vip/interface red., you can turn on statefull failover [not possible with box-to-box] and it is easier to troubleshoot.
Regards,
Gilles.
Thanks for rating this answer.

IP over OTN or IP over DWDM?

these are two main trend in IP core Network construction.
The core different between them is how to dealing with the TDM service or other small granularity service in electrical layer. in Router or in OTN?
What is your opinion? I find many expert or communication fancier here, so beg your answers.

The core different between them is how to dealing with the TDM service or other small granularity service in electrical layer. in Router or in OTN?
As per my knowledge, difference between IP over DWDM or IP over OTN is which method can take all type of traffic (voice, data, video etc ) in efficient way not just TDM service or granularity (ROuter cannot beat SONET/SDH boxes in handling TDM traffic).
Most of the traffic now a days is IP not TDM, whereas OTN are good for TDM
Question is what can take packet effieciently without too many layers in between. Whether to add IP feature to OTN or Transport feature to Router.
I have no answer who will win IP in router or OTN but IP over DWDM (In router ) will not be the best solution. This method is good for point to point High speed connection things will change if you have lot of traffic to crossconnect.
In other post you have question that how can you separate traffic on different wavelngths, what do you think will your router will act as a crossconnect to segregate different traffic or what if you need only 5 Gig to point A and 5 Gig to point B will the router grrom that traffic?

WLC Redundancy over L3 link

Hi All,
Is it possible to deploy WLC redundancy over L3 link???
In our scenario we have 2 controllers located in 2 different sites, the link between the site is L3. AP's are deployed across four other locations, two are coming to site 1 and rest two are coming to site 2 . How can i make redundancy on this setup , Please advice
Controller is 4404 and AP's are 1231G series .
Regards
Aslam ...

What is your link between each site? Also, I suppose your ap's are running in H-REAP mode? If you don't have enough bandwidth, then you shouldn't try it. You can always try to move the ap's to either wlc and see if users have any issues or not, before you try to deploy redundancy in this matter.

Extending SAN - Native FC over DWDM Experiences

We are in the process of adding a new Data Center which will be geographically located about 60 miles from our existing Data Center, the solution I'm proposing for continuous SAN access and replication is deploying a DWDM solution (Ciena or Cisco) to be able to extend native Fiber Channel to the new Data Center which will provide for an easier and staged migration. My only concern is latency over DWDM for FC since the distance is about 60 miles, does anyone have a real life experience or have been through this type of deployment and can provide me with some feedback, advice, "what to look for" etc, will the distance be an issue using DWDM? I appreciate your responses, thank you.

A bit late but hopefully not too late to be useful.
I have two remote Data Centers thanks to a merger. Both are less than 6 miles by car and we have two paths to each of them. Both the second paths are about 34 miles in a wild ring thanks to a very important customer down south.
Our network engineer who controls the ONS doesn't have a clue about FC and has a bad attitude to boot. IP doesn't have any problems with latency but he had no idea about the SAN and latency.
I found he had somehow or another got 1 out of the four paths to go down the long link and the other 3 were using the short link. Our sync HDS True Copy got very upset about this and I could not work out why. We were getting terrible timeouts of about 300 ms. This bought down a couple of mission critical apps that relied on response times of less than about 20 ms. They would not write to disk at the remote size in enough time. We worked the problem out after a bit of yelling at each other. Now he knows to always use both paths if he fails them over and to actually let me know he is doing something. To be fair, the Brocade switches also sharing the links identified the link distance mismatch.
Another issue was turning on In Order Delivery for the mainframe. That should not be mixed with other general traffic. HDS are also (quitely) adamant that you should not mix sync and async from the same ports on the storage. I had to seperate them so we have one pair for sycn and another pair for async. It looks like a SAN problem but its the different writing patterns for sync and asnyc.
60 miles is too long for HDS sync TC. I believe there is an unwritten law that 32 to 34 miles is the longest to use for sync TC. Async is not a problem. I have not used any FC accelerators. I also have EMC arrays and I have no replication issues with them either.
When I first set up the native FC over ONS, I did a fair bit of measuring and testing. Our Exchange geo cluster using sync TC normally ran at about 5 ms response times down both paths. Thats a write to the remote Data Centre and then a write to the storage on site. Heavy work showed about 10 to 12 ms. MS suggest anything less than 20 ms. 32 miles is about 0.5 of a ms extra for latency so I never actually noticed any difference with either path.
I did a lot of async tc to keep replica's of important systems offsite and once all the fine points were worked out, it was a great solution.
60 miles could be 160 using the other path.
I have not tried FCIP but I believe there are no issues with it if the IP latency is acceptable.
Balancing of backups is a pain. The backup system might have 10 tape drives available and they will use the ones on one path and nothing on the other path. That causes congestion and slow response.. blah.. blah.. They don't care. Also, use a port channel as you need two ISL's..
NEVER tell anyone that your ISL's are over distance unless you absolutely have too. Companies will always blame that. I have a mixture of Brocade and Cisco switches using the ONS. I had a problem with my Brocade fabric and Brocade immediately stopped working on the problem as they blamed the ONS for creating timeouts, etc.. etc.. It had nothing to do with it but you see what I am saying.
Stephen

Is the IP over DWDM solution standardlized?

Because if this solution is not standardlized, the carriers cannot accept this solution--IP direct over DWDM without OTU board.
Not standardlized means absolutely monopolization. So the carriers are not fool.

I dont consider myself an expert on this topic or any other my knowledge is like few drops of the oceans so lot more to learn.
I dont think so, this is just why I opened this discussion, because, you know, no vendor would like to compliant with CRS-1 DWDM interface, OTU is the most value of the transport network. and different DWDM has different encoding method.
My optical knowledge tells me(i can be wrong) that if CRS-1 G.709 module need to be transposted over any other vendor DWDM system AND if the siganl is NOT 3R regenrated (means you are not using the transponder of other vendor)it it either going through a Optical Amplifier or Dispersion module. Then i dont think these different encoding method is considered by these modules.
These different encoding techniques(I think you are talking about FEC & Enhanced FEC ) are important when you are sending it over a distance when it undergo 3R regeneration.
Something like Crs-1 (G709 card)-Other Vendor (Optical MUx, Optical Amplifier etc NO Transposnder) -CRS-1 (G.709Card ) a setup which i think is not dependent on what encoding is being used.
Forexample here Cisco CRS-1 is implemented with Ciena Optical Transposrt. (I dont know the validity of this deployment as i know things are different when you want to deploy these solutions)
http://www.redorbit.com/news/technology/1478443/sprint_cisco_and_ciena_fuel_nextgeneration_services_with_40gbps_circuits/

Can the save as dialog box be over-ridden?

Is it possible to use the SDK to supress the Save As dialog box that appears when doing a digital signature?
Over-riding the regular Save As menu via replacing the AVDocDoSaveAsSEL HFT doesn't seem to have that effect.

Our company does online Document Management for accounting firms. One of the firms uses signatures to mark a return as finished / reviewed by a partner before going out to the IRS. They wanted to have an option to have the Save As skipped because they're going to upload the document afterwards anyway.

Box-to-box redundancy over DWDM

Similar Messages

Maybe you are looking for