CSS box-to-box redundancy heartbeat question

hi netpros,
customer is running CSS in box2box redundancy and has messed around with the heartbeat link - so both became active.
according to documentation there is only on ha link possible!
is there any other option to get this link redundant?
or should we redesign and use vip/virtual interface redundancy to avoid split brain conditions?
any hints appreciated.
best regards,
juergen

Juergen,
Vip/Interface redundancy is definitely a better solution. Faster failover time. No 1 HA link issues ....
So, that would be my recommendation.
Unless the customer is doing FWLB.
In this case, B2B redundancy is a much easier solution.
But no solution to have a backup ha link.
Gilles.

Similar Messages

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.

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.

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

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

CSS Box-box redundancy image upgrade

Hi
Please, what is the best pratice to upgrade CSS image without losing service to serverfarm.(image are stored on flash).
The css are in redundancy mode.
(ip redundancy & redundancy-phy are configured)
(1) If ip redundancy master is configure temporarily on the active CSS,then after upgrading the image on the Backup CSS(to a different image),
can redundancy force-master be use on the upgraded CSS to force is to be the master.
So that upgrade can be carried on the other CSS.
(2) If the image have been ftp-ed to the two css,
will changing the primary boot on one of the css automatically recognise the correct image in order that the CSS will be in redundancy mode.
or any method that will prevent both CSS becoming master due to different image .
Thanks

you will need console access to both CSS to change the primary boot file manually on both of them.
Then, reboot the backup CSS.
Once it is up, configure 'ip redundancy master' so the CSS will become the master.
Once master, reboot the other CSS.
However, there will be traffic lost as the backup CSS is in a down state. The CSS will have to bring up interfaces and start keepalives.
Also, all active connections will be lost because this solution is not stateful.
Finally, I would like to say that I always recommend vip/interface redundancy [unless you are doing fwlb] as with this solution the backup CSS is *alive* [no need to bring up interfaces and start keepalives], it has faster failover, we have better control on redundancy parameters, and it is stateful if combine with ASR.
Regards,
Gilles.

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.

IOS8 doesn't render CSS box shadows correctly

According to an article at "caniuse", iOS7.1, 8, and 8.1 are supposed to support the CSS3 property box-shadow. However, I have an html file to which I could direct you which shows that this is not the case. The file I have is simple-minded, containing CSS only for the box-shadow in question. When presented in iOS8 Safari, no box-shadow is rendered. When presented in MacOS Safari, Firefox, Chrome, or Opera, the box-shadow is rendered correctly. Is this (and are other) iOS8 CSS3 limitations documented?

It works for me, but its a little flaky when zooming in. It disappears after a certain zoom level is reached.

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.

CSS Box-to-Box software upgrade

I'm getting ready to upgrade two CSS's in box-to-box redundancy mode.
The upgrade is simple enough, but what are the best practices for two boxes in box-to-box?
I suppose I can copy the software up to the master box. Then force the standby box to be master and copy up the software to the standby.
Perform the upgrade/reboot on the standby. Then once the standby is again operational, do the master.
Seems cumbersome. Any suggestions?

I would suggest upgrading and rebooting the secondary CSS, then do the primary. Â However, I would suggest you verify the APP session status between the 2 CSS's BEFORE upgrading and rebooting the primary. Â If you can ensure APP session communication between the load balancers you should be okay to perform the upgrade on the primary device. Â In my opinion this is the better if the two options you have outlined.
- JasonÂ

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.

Since upgrading to Mavericks, 10.9.1, pictures that come attached to emails no longer display. There is only a blank space that after about 1 minute, has a small box with a question mark. How can I go back to attached images?

Since upgrading to Mavericks, 10.9.1, pictures that come attached to emails no longer display. There is only a blank space that after about 1 minute, has a small box with a question mark. Double clicking on the box will open the image in a separate window. It's very slow and tedious for multiple images. How can I go back to attached and displayed images? If I click on "Forward", the images appear instantly in the email to be forwarded.

Scott,
My problem seemed to fix itself. Or, by shutting down the computer one night, instead of putting it to sleep, may have reset something. Since updating to Mavericks, I always (or usually) let the computer sleep overnight or anytime I'm walking away from it. A few days ago, I was updating notes for my kids about how to find all my stuff and how to turn on my computer, so I wanted to rewrite the start-up procedures for the iMac, just in case they ever need to. Well, I shut it down one night so the following morning, I could write down each step. Lo and behold, the images, etc. are all there again! Solved, but I'm not sure why.
Tom

I keep getting the little blue box with the question mark

Hi
I have 10.6.7 system software and my safari is 5.0.4
I have called apple twice with this problem already but nothing has helped except for short times.
I have reset safari about one dozen times and when I do I reset the top 7 items and I've emptied the cache in addition just in case. I've also taken my safari preference plist out of my library and trashed it.
And I've run disk utilities many times and restarted my computer. Each thing I do will solve the problem for a short time, even up to a day or more (or less) but then it comes back. For instance on Facebook maybe 1/8th of the thumbnail images have the little blue boxes with the question marks but most don't. I can't figure it out. Sometimes even the iPAD safari gets them too but my firefox doesn't show them and neither does Safari on my eMac.
Yesterday the question marks even showed up in ONE mailing on all 3 computers with the question marks in the blue boxes (meaning my iMac, my eMac and my iPad) but then it just all resolved after a few hours. This does sound like possibly a server problem except today it's happening (in Safari again) only on this iMac in Safari (not firefox) and not on the other two devices.
One more thing, since they changed my radio on the roof for my wireless internet, the 5.8 phone cuts out the internet when I use it. The problem has gotten worse since they changed the radio to the same frequency as the phone, it's a much faster service than the 2.4 radio. I don't know if this is related or not.
Thank you,
Martha

<Contact your ISP.
Is it possible, Carolyn, that this would mainly and almost always be only affecting the iMac and Safari in the iMac if it were a server issue? Right now Safari has more blue boxes with question marks than ever and the eMac and iPad have none. Firefox on the iMac has none also.
I should try a direct connection and by pass the router and see if that makes a difference.
I will contact them tomorrow but I want to get clear in my head first all the facts and possibilities.
Thanks!
Martha

Box with a question mark inside instead of the picture or graphic

I notice when I open i-Tunes 10.1.1 or the App Store most everywhere there are supposed to be graphics or pictures there is just a box with a question mark inside?
I am up to date on all software, what do I need to do to get the graphics to come up?
Thanks

"OS X Lion includes a new feature called Lion Recovery that includes all of the tools you need to reinstall Lion, repair your disk, and even restore from a Time Machine backup without the need for optical discs."
See: http://support.apple.com/kb/HT4718
If this doesn't work, it is likely that your HDD has failed, or is failing.

CSS box-to-box redundancy heartbeat question

Similar Messages

Maybe you are looking for