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

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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

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.

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.

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.

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.

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.

Override Link Class in "Other CSS" Box

Hi -is there a way to override the class of a link in the "other styles" box for a component?
My example is this:
I use a skin with a dark header. The text for the widgets in the header are white (Administration, etc)
The body of the site is white.
When I put another widget that uses the same class (x106 in this case) it makes the link color white and you can't see it on the page.
I've tried many ways to go into the "other CSS" box (under the style tab) and none seem to work.
Thanks.

Hi - thanks.
That's not exactly the problem. I know what the classes are (x106 and x107).
The problem is that I am trying to use two "widgets" or ADF components (like the login/logout or My Favorites links) on two different background colors.
I cannot get into the code of the ADF component to tell it to use a different class.
Also, if I change the class (x106 for example) it changes ALL of them.
What I think I need is a way to override the CSS for the link in the "Other CSS" box for that component somehow (I've tried many things - can't figure it out and not sure it can be done). I would think that this would override the class in the skin.
In short - what I'm asking, I guess, is this.
IS there a way to override the CSS LINK color for an ADF template component - OTHER THAN in the Skin's CSS file.
Thanks!

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

My CSS box doesn't seem to be pushing the text out of the way

Hi guys,
Have
a look here
I've just managed to get CSS boxes working on my site, and as
you'll see have applied them to the right hand side of a number of
pages and added links. I looked at the site locally and online last
night from my machine and everything seemed to be working as
expected.
However, I've just got to work and had a look at some of the
pages and the text box A - doesn't seem to have extended enough to
surround all of the linked text and B - doesn't seem to have pushed
the surrounding text out of the way enough so now there's a
horrible overlapping this going on.
As I have set the box's height properties to something like
150 (can't quite remem) I'm assuming this is what is causing A and
B? So, how do I then set the box's properties so that it will
shorten or lenghten depending on how much text I put inside it -
just leave the height property field blank?
Hope you can help guys!
Let me know if you need more info.
Cheers,
James

JamesFryer wrote:
So, how do I then set the
> box's properties so that it will shorten or lenghten
depending on how much text
> I put inside it - just leave the height property field
blank?
Yes. The answer is to never set the height of a box which
contains text
(unless its for a scrolling area). Let the amount of text
within the box
determine the height.

Reroute some vrf traffic between 2 sites over redundant link

hey guys,
We have a single client (in vrf) with 2 sites in different states and running over our mpls core.. Our primary link in our core is experiencing degredation of service and want to route this client over our redundant link while keeping all other clients going over our primary link - is this possible?
The client in question has its own vrf (L3VPN) at both sites and is running over mpls between both sites. We want to re-route this particular client to take our backup path, while keeping everyone else between both sites going over the primary. We are not using TE, instead LDP to build MPLS.
I don't believe this is possible to only re-route one client, however I thought I would ask the question.
We cannot failover to secondary link for everyone between both sites because the link doesn't have the capacity.
Thanks in advance.

Hi,
Using MPLS TE would certainly be an option. You would need to setup an MPLS TE LSP over the backup. You would also need to configure a separate lookback interface on each PE and use this loopback interface address as the next hop for the specific VRF
ip vrf X
bgp next-hop loopback 999
ip route 255.255.255.255 Tu1
This way you would make sure that only the traffic for this specific VRF would travel over the TE tunnel.
Regards

How do I create text flow in Pages 5.1 if text boxes do not link?

Hi Everyone,
Is there any way Pages 5.1 enables text to flow between text boxes if the text boxes do not link? Thanks!

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CSS box to box redundancy redundant link

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