Load balancing connections in 3.7

Hi,
in our current setup we use read-write and read-only proxies. With 3.7 a client that is supposed to connect to a read-only proxy can be redirected to a read-write proxy (and a read-write to a read-only).
Is there a way to partition proxies for load balancing?
Haven't checked the API yet, maybe it is possible to do it by implementing a custom load balancer but I really want to avoid implementing a custom one as much as possible.
Thanks,
Alberto

Hi NJ,
we need to access the same cache in a read-only or read-write way.
Anyway thanks you are right, the key point is using different proxy schemes, specifically different proxy services. I've just read the documentation more carefully and it says:
"... proxy – (default) This strategy attempts to distribute client connections equally across proxy service members..."
They should be partitioned by proxy service.
I'll test it tomorrow.
Thanks,
Alberto

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Load balancing across 4 web servers in same datacentre - advice please

Hi All
Im looking for some advice please
The apps team have asked me about load balancing across some servers but im not that well up on it for applications
Basically we have 4 apache web servers with about 2000 clients connecting to them, they would like to load balance connections to all these servers, they all need the same DNS name etc.
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Carl,
What you have mentioned sounds very straightforward then everything should go well.
The ACE is a load balancer which takes a load balancing decisions based on different matching methods like matching virtual address, url, source address, etc then once the load balance decision has been taken then the ACE will load balance the traffic based on the load balance method which you have configured (if you do not configure anything then it will use the default which is "round robin"), then it will send the traffic to the servers which it has available and finally the client should get the content.
If you want to get some details about the load balancing methods here you have them:
http://www.cisco.com/en/US/docs/app_ntwk_services/data_center_app_services/ace_appliances/vA3_1_0/configuration/slb/guide/overview.html#wp1000976
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Bridge Mode
One Arm Mode
Routed Mode
Here you have a link for Bridge Mode and a sample for that:
http://docwiki.cisco.com/wiki/Basic_Load_Balancing_Using_Bridged_Mode_on_the_Cisco_Application_Control_Engine_Configuration_Example
Here you have a link for One Arm Mode and a sample for that:
http://docwiki.cisco.com/wiki/Basic_Load_Balancing_Using_One_Arm_Mode_with_Source_NAT_on_the_Cisco_Application_Control_Engine_Configuration_Example
Here you have a link for Routed Mode and a sample for that:
http://docwiki.cisco.com/wiki/Basic_Load_Balancing_Using_Routed_Mode_on_the_Cisco_Application_Control_Engine_Configuration_Example
Then as you could see in all those links you may end up having a configuration like this:
interface vlan 40
description "Default gateway of real servers"
ip address 192.168.1.1 255.255.255.0
service-policy input remote-access
no shutdown
ip route 0.0.0.0 0.0.0.0 172.16.1.1
class-map match-all slb-vip
2 match virtual-address 172.16.1.100 any
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policy-map type loadbalance http first-match slb
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serverfarm host web
rserver lnx1
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ip address 192.168.1.11
inservice
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ip address 192.168.1.12
inservice
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Please mark it if it answered you question then other users can use it as reference in the future.
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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
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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.
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ARFC: Single Server and Load Balancing

Hi All,
I am trying to create aRFC model. In SAP logon screen, I can see two tab pages - Single Server and Load Balancing.
Can you please let me know when we have to use which tab?
Thanks
TG

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Single Server connect means that your are directly connecting to an ABAP Server using hostname and systemnumber you have to provide.
Load Balancing Connect means that you specify the message server of the central instance of an ABAP Server group. The SAPGUI first connects to the message server which will provide the SAPGUI with the information about the best performing ABAP server. SAPGUI will then connect to this ABAP server.
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Peter

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
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3. SSL port 443 server load balance connections:
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                        Vincent

Hi Vincent,
Can you please eloborate your question ?

Using ACE to load balance HTTP/S traffic between client & proxy server using tcp 8080

Folks,
I have a scenario where ACE is in load balancing connections to a bunch of Websense servers in a one-armed topology. ACE presents a single VIP to web browser clients and each client's browser proxy configuration is populated with the VIP DNS name. Traffic then gets load balanced between the Websense servers. The problem arises due to Websense requiring the 'X-Forwarded-For' HTTP header in order to obtain the source IP of the client.
ACE inserts this header into the standard HTTP 'proxied' traffic but doing this for HTTPS traffic has required the configuration of the ACE SSL proxy client server.
So the problem I have is this:
How to configure ACE to load balance both HTTP & HTTPS applications using a single VIP and tcp port number ie tcp 8080
The ACE hardware being used is ACE20-MOD-K9 - MODULE
I have attempted to use a L7 class map to match all ciphers and attach this to a L7 Policy-Map but the documentation highlights the fact the 'match cipher' configuration is only available on the ACE appliance.
I believe I am on the correct track. The HTTPS traffic must be identified and used to match against PolicyA and HTTP traffic matched against PolicyB
I'm looking for ideas! I'm hopeful someone must have solved this problem previously!!
Regards,
Simon

Hi Simon,
The classification has to work on different ports. Whether client types http or https doesn't matter to client. His request will reach VIP which will classify the traffic based on port, protocol first and then it can look into further detail to send the traffic to appropriate serverfarm.
You can class-map match-any xxxxx
2 match virtual-address x.x.x.x tcp any
and then you configure further classification on the basis of L7 like url, header etc.
But again, you will still need SSL termination on ACE.
Regards,
Kanwal
Note: Please mark answers if they are helpful.

Want to know about ACE module in 6509 : load-balancing concept

Hi,
I am quite new in this field , where i need to configure and understand the concept of load-balancing through ACE.
In my existing network set-up , i have some application servers as well as some other servers where i am looking for load-balancing.
I have gone through some of the site and cisco site as well and i came across ACE module which can be installed in 6509 switch.
I have 6509 switch as well but before going for installing the ACE module I am keen to understand below things:
1) what is difference between CSM or any other product load-balancer and ACE module :
Gone through site as well , but not getting proper answer or comparison.
1) I have some of the server configured with clustering and getting one virtual IP, In this case , will ACE work ?
2) If suppose i go for configuring different IP address with all server IP :
How do i achieve it ?
3) what is Virtual IP concept in ACE because i do not have and other ACE module then why do i need virtual IP ?
4) will the load-balancing happens based on destination based or session based ?
Please share the knowledge. It would be great help for me to go ahead with ACE and configure it and understand all the application ?

Hello,
1) what is difference between CSM or any other product load-balancer and ACE module :
There are several differences but to say simply, you get higher performance and more features with ACE module/appliance comparing others.
One big difference is that with ACE seriese, you can configure multiple contexts on one box (virtual load-balancers on one box) that makes us possible to provide a virtual load-balancer to a customer. In that way, the customer can access and makes changes on only the virtual box. You can split management domain for each customers. Also using contexts, you can assign certain resources available on the hardware for each contexts according to their service contract.
ACE serise has specific hardware chip for supporting SSL termination but some others do not.
For instance, you need a CSM-S, or a CSM and a SSL module to terminate SSL.
The other thing I should mention is that our most recent product is ACE serise that means it has longer product roadmap.
Let me try clarifying your other questions.
3) what is Virtual IP concept in ACE because i do not have and other ACE module then why do i need virtual IP ?
4) will the load-balancing happens based on destination based or session based ?
I think I'd better to put 3) and 4) first.
Virtual ip address (VIP) is the address to which client accesses.
VIP is tied with a serverfarm or serverfarms, in a serverfarm one or multiple rservers can be configured.
"serverfarm" is a group of "rservers".
"rserver" means real-server that has an ip address and processes transactions.
When a client accesses to the VIP, ACE picks up a rserver according to algorithm.
If you configure a VIP that is tied with a serverfarm where only one rsever is configured, client accesses to the virtual ip address are
all forwarded to the rserver.
If you configure a VIP that is tied with a serverfarm where multiple rsevers are configured, client accesses to the virtual ip address are
balanced among those rservers.
If you configure multiple VIPs, client accesses to those VIPs are forwareded to corresponding rservers according to configuration.
1) I have some of the server configured with clustering and getting one virtual IP, In this case , will ACE work ?
ACE load-balances connections to configured rservers.
If the clustered servers are sharing one virtual ip address and you configure the virtual ip address as a rserver, all connections are
sent to the virtual ip address. That is not "load-balancing" on ACE... You need multiple rservers to which ACE load-balances connections.
2) If suppose i go for configuring different IP address with all server IP :
How do i achieve it ?
You can configure those ip addresses as rserver ip address.
Multiple rservers are tied into a group, "serverfarm".
I'm not certain about your culstered servers but I guess you can configure each ip addresses in the culster as rservers.
Then put those rservers in a serverfarm.Client accesses to a virtual ip address configured on ACE for the serverfarm.
This way connections are load-balanced among those rservers depending on load-balancing algorithm you choose.
Above is just an overveiw. ACE gives you granular control not mentioned above.
I can provide more specific information if you tell me details of what you are trying to archive with ACE.
Regards,
Kimihito.

Load balancing connections in 3.7

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