CSM(content switching module) supports the 2 tier server load balance ?

hi everyone,
Does any know the CSM support 2 tier server load balance ?
this means that CSM perform the server load balance for servers and the same servers require another time Server load balance. In the other word,
the CSM supports server port and client port for server load balance ?
thanks
fred.

Hi, this seems to describe a typical case of multi-tier design where the CSM needs to handle 2 types of connections:
1. clients->CSM->serverfarm1
2. serverfarm1->CSM->serverfarm2
We usually refer to the second type of connections as server-to-server load balanced traffic.
There is no problem in handling that scenario with the CSM and you have a few options.
In particular, each virtual server on the CSM can be configured to only accept incoming connections from a specific VLAN, so you can use that as an additional security measure or to distinguish connections based on which VLAN they come in from.
If you want to, you could even configure the CSM with 2 virtual servers with the same exact virtual IP and L4 port, but listening on 2 separate VLANs (the client-side VLAN and serverfarm1 VLAN) and use a different server farm based on that.
One important thing to keep in mind when handling server-to-server load balanced connections: if serverfarm1 and serverfarm2 are on the same VLAN, you have to configure "client NAT" for the server-to-server connections, to force the return traffic back to the CSM.

Similar Messages

  • CSM-Content Switching Module

    Hi All,
    How to shutdown Content Switching Module in Cat 6500 switches ? I want to shutdown only CSM-Module without disturbing Chassis.
    Can anyone please send me the command on that ?
    Highly appreciate your valuable reply.
    Thanks,

    Hi,
    Assuming you are using IOS, you can power-down a module in a 6500 chassis using the command
    "no power enable module " in global config mode where is the slot number of the CSM.
    If you are using CatOS then the command would be:
    "set module power down "
    The CSM should be hot-swappable so you should be able to just pull it out of the chassis, but I think that is a bit vicious if you only want to shut it down.
    HTH
    Cathy

  • App.server load balancing for SAP System with 1 PS

    Hi,
    In SAP CPS 7.0 (Build M26.12) I have a SAP system with Central Instance + 10 App.servers, but all instances are managed by 1 ProcessServer.
    After activating the "App.server load balancing" setting in SAP system definition the application servers are becoming visible in CPS with their load factors (number of BGD wp's on app.servers) and load numbers (number of active jobs on app.servers).
    This is so far fine, but the additional functionality is not working as I would expect, I have issues with 2 functionalities:
    1. Based on documentation after activating also the XAL connection the CPS should submit the job on app.server with best performance based on XAL monitoring data filling the TARGET_SERVER parameter.
    This functionality is not working for me at all
    2. A useful functionality after activating the "App.server load balancing" setting is that the ProcessServer is going to "Overloaded" status when all BGD wp's of SAP system are occupied, thus restricting submitting new jobs during overload situation. But I had an issue also with this functionality, after SAP system recovery from overload situation, the CPS still remained in Overload status (so no new jobs were submitted).
    As a workaround I had increased the treshold values for loads on all app.servers for this SAP system, what was fine for several days, but after a while I believe this was a reason of unexpected performance issues in CPS, therefore I have deactivated the 'App.server load balancing" setting at all for this ProcessServer.
    I would appreciate your feedbacks with this functionality.
    Thanks and Regards,
    Ernest Liczki

    Hi Preetish,
    This connect string option is to loadbalance RFC connections. These are balanced upon login, once you are connected to a particular application server (AS) you stay on that server until you reconnect.
    Since CPS uses multiple RFC connections, this will result in the connections being distributed over the available AS resources which is fine as long as they are generally evenly loaded. If you have certain AS hosts that are continuosly more loaded than the rest, then you probably don't want the CPS RFC connections to end up on these servers.
    The original question is about loadbalancing of batch jobs over the available AS resources, and this is done independent of the RFC connection load balancing. Even if all CPS RFC connections are pinned to the DB/CI host, you can still loadbalance jobs over the available SAP AS hosts, either by using SAPs builtin balancing, or the CPS algorithm by activating the checkbox as indicated in the first entry in this thread.
    Finally, to reply to Ernest's question: I believe there are some fixes on the app load balancing in the latest release, M26.17 should be available on the SWDC now.
    Regards,
    Anton.
    Edited by: Anton Goselink on May 29, 2009 9:06 PM

  • Help choose the appropriate etherchannel load balance method

    Hi
    I have 2 network architectures :case A and case B  (found architecture below)
    Case A : one server connected on the switch on each site
    Case B : 3 server connected on the switch behind a router on each site
    2 site are connected by 2 wireless link :each wireless link have 105 Mbps bandwith (I absolutly need the agregate bandwith 210)
    Site headquarter is the principal site and site backup is use to backup data located on the principal site
    I use Gbit cisco  2960 switch
    I use etherchannel to agregate the 2 switch port (port 1 and port 2) where the 2 wireless link are connected
    I configure src-mac for case A but all trafic is send only on one wireless link .
    Please help me to choose the more appropriate load balance method to load balance traffic between the 2 link for the case A and for the case B
    Please advise
    Thanks in advance

    Disclaimer
    The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
    Liability Disclaimer
    In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
    Posting
    Your Case A might be handled by port hashing, but unfortunately most Cisco platforms don't support it.
    Your Case B isn't much better, as you only have 3 hosts on each side, and according to your drawing, they are behind routers, so you don't want to use MAC hashes.  If you don't have port hashing, next best choice might be src-dest-IP hashing.  Again, though, with just 3 hosts, your distribution will likely not be very balanced, especially over shorter time intervals.
    To obtain best utilization of your links, you need some kind of better link bonding, such as MLPPP (unfortunately, usually won't scale to FE rates) or a hardware MUX.  Next best option, if you could route across the links, would be something like Cisco's OER/PfR which can dynamically load balance.

  • Using ACE for proxy server load balancing

    Hello groups,
    I wanted to know your experiences of using ACE for proxy server load balancing.
    I want to load balance to a pool of proxy servers. Note: load-balancing should be based on the HTTP URL (i can't use source or dest. ip address) so that
    a certain domain always gets "cached/forwarded" to the same proxy server. I don't really want to put matching
    criteria in the configuration (such as /a* to S1, /b* to S2, /c* to S3,etc..), but have this hash calculated automatically.
    Can the ACE compute its own hash based on the number of "online" proxy servers ? ie. when 4 servers are online, distribute domains between 1,2,3,4 evenly.
    Should server 4 fail, recalculate hash so that the load of S4 gets distributed across the other 3 evenly. Also load-balancing domains of S1 ,S2 and S3 should not change if S4 fails.....
    regards,
    Geert

    This is done with the following predictor command:
    Scimitar1/Admin# conf t
    Enter configuration commands, one per line.  End with CNTL/Z.
    Scimitar1/Admin(config)# serverfarm Proxy
    Scimitar1/Admin(config-sfarm-host)# predictor hash ?
      address         Configure 'hash address' Predictor algorithms
      content         Configure 'hash http content' Predictor algorithms
      cookie          Configure 'hash cookie' Predictor algorithms
      header          Configure 'hash header' Predictor algorithm
      layer4-payload  Configure 'hash layer4-payload' Predictor algorithms
      url             Configure 'hash url' Predictor algorithm
    Scimitar1/Admin(config-sfarm-host)# predictor hash url
    It does hash the url and the result takes into account the number of active proxies dynamically.
    This command has been designed for this kind of scenario that you describe.
    Gilles.

  • Server Load balancing issues

    the servers are loadbalancing between the switches '3'
    and '2' and the link between the two switches is blocked.
    This link was forwarding before and thus any traffic going to the server was
    send to the Servers correctly no matter on which switch they are active.
    However after addition of another link in between the switches 'root'
    and '1', the path cost to the root has decreased and thus the link
    between the '2' and '3' is Blocking and the other link between
    the '2' and '1' is Forwarding as it should be ideally. But
    this would be creating an issue because the trafic coming from outside i.e.
    through switch '1' to the server will be correctly send to the
    server if the server NIC is active on the '3' because the Virtual MAC
    addresses are binded accordinlgy. In case the server falls onto the other
    NIC which is on the '2' the traffic won't be able to pass because the
    MAC address is not binded on the trunk connecting the switches '1'
    and '2'. This binding cannot be done because the same MAC address is
    being learned on the another trunk on the '1' which is connecting
    to 'root'. So if we bind the same Virtual MAC on two trunks on the same
    switch ('1') then this will cause MAC Address Flapping on the
    switch and hence canot be done.
    In another case,we can able to bind virtuak MAC on two trunks on the same
    switch('1') and it's working fine.
    The servers are load balancing in round robin fashion. each server has 2 NICs and work in Active-Passive mode. The servers load balance each other when all their active links are connected to '3' switch but when two of the active NICs of two servers are connected to '3' and the rest of the two active NICs from the other two servers are connected to '2' switch then only the forst 2 servers load balance and the other 2 servers do not load balance.
    Please help.
    Thanks in advance.

    In my experience, server load balancing is one of the most difficult things to get going properly in a switched LAN environment. Switched LANs are designed so that one MAC address can only be bound to one switch port. Therefore, if you have two NICs with the same MAC address (real or virtual), then you will get flapping somewhere.
    I have seen various ways that the manufacturers try to get around this limitation of switched LANs. For example, one technique I have seen, practiced by ISA Server, is to use a multicast MAC address for the service so that frames go to both exit ports. But that does not always work well unless you tweak the network to acommodate it.
    What sort of servers are they, and what system is used for the load balancing?
    Kevin Dorrell
    Luxembourg

  • Dev6 Server Load Balancing

    Hi
    I try to install Load Balancing with Dev6/Patch2 and OAS4.0.7.1
    on 4 Machines with WinNT Server 4 SP 5. I tried to do it as
    described in the documentation. But I did not succeed. It seems
    to be that the Doc is not complete or wrong. Could somebody give
    an example how to set up the LB Servers and Clients as NT
    Services ?
    Thank's in advance
    Charly
    null

    Hi Steven,
    No LACP and SLB are different.
    LACP is the Link Aggregation Control Protocol, which is the protocol used within the IEEE 802.3ad (now 802.1AX) Link Aggregation mechanism to control the bundling and unbundling of the physical links into an aggregate link.
    Server Load Balancing is a feature in IOS to load balance traffic destined to a virtual IP across a group of real IP. From Configuring Server Load Balancing:
    The SLB feature is a Cisco IOS-based solution that provides IP server load balancing. Using the IOS SLB feature, the network administrator defines a virtual server that represents a group of real servers in a cluster of network servers known as a server farm.
    Server Load Balancing is effectively what the Cisco Application Control Engine (ACE) etc., does but in IOS.
    Regards

  • What is the concept of load-balancing

    Hi All,
    can any one explain me the concept of load-balancing
    Thanks.

    In simple words, when one server within a load-balancing setting (where more servers are able to run the same process) has too many requests to process, it will off-load a number of those requests to other servers in the same setting. This will be done in a way that it will be transparent to the final user, meaning that the user who has made the request does not know or perceive which server has processed his request.

  • WLC Radius Server Load Balance

    Hi,
    Can someone provide me detailed description on how WLC Radius Server Load balance works.
    Becuase, I encounted a problem of User Authenticated with the 1st Radius Server, but Accounting Records are actually on 2nd Server .
    Any response will be very appreciated
    -Angela

    Hi Angela,
    I pasted below the part of config guide explaining the different modes. In summary :
    -Fallback off means : when 1st radius server shows dead , WLC moves to the second. And will only change again when the 2nd is dead too.
    -Passive means : whent 1st radius is dead, WLC moves to the second. If there is a new authentication coming in, it will try the 1st radius server again
    -Active means : WLC constantly sends radius probes to detect when primary is back up.
    config radius fallback-test mode {off | passive | active}
    where
    •off disables RADIUS server fallback.
    •passive causes the controller to revert to a server with a lower priority from the available backup servers without using extraneous probe messages. The controller simply ignores all inactive servers for a time period and retries later when a RADIUS message needs to be sent.
    •active causes the controller to revert to a server with a lower priority from the available backup servers by using RADIUS probe messages to proactively determine whether a server that has been marked inactive is back online. The controller simply ignores all inactive servers for all active RADIUS requests. Once the primary server receives a response from the recovered ACS server, the active fallback RADIUS server no longer sends probe messages to the server requesting the active probe authentication.

  • Please provide vShield Manager Server Load Balance values

    Hi All:
         I couldn't find values about the server load balance of vShield Manager.
    Please provide these value:
    1. Throughput      Mbps
    2. Web port 80 server load balance connections:
    3. SSL port 443 server load balance connections:
    Thanks
    BR.
                            Vincent

    Hi Vincent,
    Can you please eloborate your question ?

  • A question about the SharePoint services load balancer

    Let's consider a farm with one WFE and two app servers, A and B. Both app servers are running the Managed Metadata Service (MMS). 
    User requests a page from the WFE, which talks to the database server. The operation needs information from the MMS, so the WFE requests information from the round robin load balancer for SharePoint web services. Let's say server A is down. 
    Here's my question - what happens next?
    a) The round robin load balancer tells the WFE the MMS is on servers A & B. The WFE tries server A, fails, and returns a failure. 
    b) The round robin returns servers A & B. The WFE tries server A, which fails. The WFE then tries server B.
    c) The round robin returns either A or B, depending on which is next in rotation. The WFE tries the server returned. If the server returned is A, the WFE returns a failure. 
    d) The round robin returns either A or B, depending on which is next in rotation. The WFE tries the server returned. If the server returned is A, the WFE queries the round robin service again.
    e) The round robin knows server A is down, returns only server B to the WFE. 
    Philo Janus, MCP Bridging business & Technology: http://www.saintchad.org/ Telecommuter? http://www.homeofficesurvival.com/ Author: Pro InfoPath 2007 & Pro InfoPath 2010 Pro PerformancePoint 2007 Pro SQL Server Analysis Services 2008 Building Integrated
    Business Intelligence Solutions

    When a Service Application is down, the application load balancer removes that endpoint from the load balancer. When it becomes available again, it adds it back. This way the WFE would just contact the MMS endpoint that was available, not try and timeout
    against an unavailable endpoint.
    Trevor Seward
    Follow or contact me at...
    &nbsp&nbsp
    This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

  • Content Switching Module (CSM): Sessions stuck in closing state

    Hi guys,
    I'm troubleshooting a CSM with 4.3(1).
    We migrated a real server from windows to linux, since then lot's of sessions stuck in closing state until the idle timer expires.
    I traced the traffic from the client to the csm and from the csm to the real server what I saw is the following behaviour at the end of a session:
    windows real server: client sends FIN -> real server acks the FIN -> real server sends FIN -> client sends RST -> real server sends RST -> CSM deletes session from session table
    The linux real server mostly behaves like the windows real server but sometimes behaves as follows:
    client sends FIN -> real server sends  FIN, but does not ack the FIN sequence number of the client -> real server sends RST -> client sends RST -> CSM does not delete  session from session table, it stucks in closing state
    Does anybody know how I can solve this problem of half-closed sessions other than decreasing the idle timeout?
    Is it possible to configure CSM to close and delete sessions not only on FIN-ACK packets but also on RST packets?
    Or to use a different fast idle timeout when sessions are half-closed?
    Many thanks in advance,
    Thorsten

    Hi Fabrizio,
    CSM_FAST_FIN_TIMEOUT is already set to 10 seconds.
    What I found out while testing is that CSM_FAST_FIN_TIMEOUT works with configurations where idle timeout is configured > 0.
    But when idle timeout is configured to 0 (what meas no idle timeout) the csm seems not to use CSM_FAST_FIN_TIMEOUT: Half closed sessions will stuck in closing state.
    Any idea why cms behaves this way?
    Regards,
    Thorsten

  • Cisco WAAS and Content Switching Module compatiblity

    We are planning to implement WAAS on our hub's 6500 core switches, so that TCP connections from the end sites users to the servers in the hub can be optimized. But we have the servers VLAN groups under the Cisco CSM module already. Are the client-server connections still able to be optimized by WAAS?

    Hi Joe
    let's seperate out the two topics here.
    a) WAAS traffic interception with wccp
    b) CSM
    a) when you say vlan 200 is where target servers are connected, is that the CSM client side vlan? or the actual server vlan ?
    the bottom line is you need to make sure the interface where you configure "ip wccp 61 redirect in" is recieving traffic from servers towards .
    Good reference for WCCP best practices in 6500
    http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_paper_c11-629052.html
    b) yes you can configure stickiness for session persistance as in below URL
    http://www.cisco.com/en/US/docs/interfaces_modules/services_modules/csm/4.2.x/configuration/guide/addftrs.html
    Thanks

  • Server Load Balance in one network using CSM Cat6509

    I have 2 Web Servers with real IP address 10.1.12.61 and 10.1.12.62 (subnet mask 255.255.255.0). The virtual IP address configured on CSM is 10.1.12.100
    I also have 2 Application Servers with real IP address 10.1.12.81 and 10.1.12.82 (subnet mask 255.255.255.0). The virtual IP address is 10.1.12.120.
    Users will access Web server using the virtual IP address (10.1.12.100) so that the traffic will be load balanced.
    But there is also requirement that those Web Servers access Application Servers using IP address 10.1.12.120 so that the traffic will be load balanced as well.
    Is this requirement feasible?
    Can CSM load balance between servers in one network address?

    Budiman,
    I am building the same situatiuon here. But the most simple part seems not to be working. I have two webservers in the same subnet as my VIP.
    The clients can be everywhere in every subnet.
    This is what happens:
    btpebgw70#sh mod contentSwitchingModule 9 conns
    prot vlan source destination state
    In TCP 401 192.6.53.42:1901 151.183.58.196:80 ESTAB
    Out TCP 401 151.183.58.196:80 192.6.53.42:1901 ESTAB
    ok this is good but:
    btpebgw70#sh mod contentSwitchingModule 9 reals detail
    151.183.58.201, ORBIS, state = OPERATIONAL
    conns = 0, maxconns = 4294967295, minconns = 0
    weight = 8, weight(admin) = 8, metric = 0, remainder = 0
    total conns established = 58, total conn failures = 58
    the failures have the same value as the established. Can you send me your config part of the csm because I am getting tired of this. Please email to [email protected]
    Thanks in advance!

  • Server load balancing for application access using multiple servers

    1.what are the methods supported by cisco switches for load balancing
    2. I want to achive users to access 1 particular ip from different locations but phsically few servers which handle the application and data

    well some servers allow you to install routing protocols on them. you could OSPF some links together.
    or you could NLB if it is a microsoft server. this uses a heartbeat network, a virtual mac and an IP address bound to the vmac.
    you could use NIC teaming. broadcom nics on dell servers allow you to configure them for loadbalancing, failover and a few other options.
    or if the servers are mirrored using MSCS or something similar (i.e configured the same but independant) you could just load balance using DNS.
    hope this helps. jsut some ideas quickly off the top of my head

Maybe you are looking for