CSS 11501 - Balancing vs. Sorry Server

Hi,
I need a little advice.
I have configured my test CSS box with two services. I enabled keepalives and load balancing with one server having a weight of 5, while the other is set to the default.
Testing has proven successfull in redirecting requests when the primary server (weight 5) is taken offline. However, when it comes back online, not all requests are sent to it, and some requests still go to the secondary server.
My question:
If I want all requests to go to the primary server except in the event it is unavailable, should I configure the secondary server as a Sorry server, and not as a load balanced peer? I would effectively be using the Sorry server as a secondary content server.
Is this workable? Am I missing something?
Thanks,
JM

JM,
yes you need the sorryserver option if you don't want traffic to go to your backup.
Whatever weight option you configure, there will always be a fraction of the traffic going to the backup.
Gilles.

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Hi,
I have CSS configured in single arm and I have multiple servers configured for load balancing and it is working fine but when I am configuring Exchange server for load balancing I am facing problem and applications and printer/scanners are not able to send the email through the Virtual IP address configured for exchaneg server.
But if we configured the real server IP in the printer/scanners they are able to send the email. While checking the logs on the exchange server, it is showing that request for the email so coming from the Exchange VIP configured in the CSS.
I can telnet on port 25 on the VIP address (192.168.200.237). But unable to send the email through this VIP.
Below is the configuration
service ENOC_EXCHANGE-1
ip address 192.168.200.235
active
service ENOC_EXCHANGE-2
ip address 192.168.200.236
active
content EXCHANGE
    add service ENOC_EXCHANGE-2
    add service ENOC_EXCHANGE-1
    vip address 192.168.200.237
    active
group EXCHANGE
add destination service ENOC_EXCHANGE-1
add destination service ENOC_EXCHANGE-2
vip address 192.168.200.237
active
DC-CSS01# show rule GIT EXCHANGE
Name:                EXCHANGE   Owner:                ENOC_GIT
State:                 Active   Type:                     HTTP
Balance:          Round Robin   Failover:                  N/A
Persistence:          Enabled   Param-Bypass:         Disabled
Session Redundancy: Disabled
IP Redundancy:    Not Redundant
L3:         192.168.200.237
L4:         Any/Any
Url:
Redirect: ""
TCP RST client if service unreachable: Disabled
Rule Services & Weights:
1: EXCHANGE-1-Alive, S-1
2: EXCHANGE-2-Down, S-1
=============================================================================
Please let me know how to solve this problem. System team is saying with the physical IP address it is working fine problem with Load balancing. I have even tried with the
Add service command in the group but didnt work for me. If i will remove the group command then I cant telnet on port 25.
I think this is related to single arm modle or some wrong configuration for the NAT.
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Hi
Printers are on Vlan 80 ( gw is 192.168.80.1) and exange server is on vlan 200 (gw is 192.168.200.1) i have multiple vlan which will communcate with exchange.
I hv other servers on 200 subnet which are working fine in load balancing.
My CSS is single arm setup.
Please assist
Sent from Cisco Technical Support iPhone App

How to set up load balancing with overload server on css

can anyone tell me how to set up a load balancing config on css that will enable me to LB proxy caches and when they have too many connections then LB against an overload proxy-cache.
Such that when the normal proxy-cache farm is under the ceiling of max connections then the overload server is not used ?
I don't think redirect or sorry server will do this ?

see the below configuration,any question,just tell me.
service proxy-1
! below is the real ip of server
ip address 10.1.1.1
keepalive type icmp
active
service proxy-2
ip address 10.1.1.2
keepalive type icmp
active
! enter owner config-mode
owner proxy
! define a content rule,match what you want to load balancing
content rule-proxy
! below is virtual ip,it can be another ip segment
vip address 10.1.1.50
add service proxy-1
add service proxy-2
protocol any
advanced-balance sticky-srcip
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CSS 11501 Load Balancing with X-forwarded-for

Hi,
We have a pair of CSS 11501,
Currently it is using source ip for load balancing and 5 servers as backend , however we have users loggin in using http and based on its source IP (ISP PROXY) , it is forwarded to SERVER A.
However, we have a SSL page and when the client switches over to SSL , it is forwarded to SERVER B/C/D/E based on its source IP ( REAL CLIENT IP) .
This will cause the user to be terminated as the 5 servers are independent and not running in a cluster.
Is there any way that we can use the X-Forwarded-For address to load balance so that when users loging , they are sent to SERVER A (Based on X-Forwarded-For Header IP which translate to REAL CLIENT IP).
This way we are able to also send it back to the same server when it uses SSL.
I believe that we should be able to load balance using X-Forwarded-For IP or to rewrite the X-Forwarded-For IP into client source IP
Regards

Hi,
Unfortunately CSS does not support X-Forwarded-For, and even if CSS supports that, this wont work if you are not using SSL termination.
One option that you can use here, is using SSL termination, so you can manage the SSL traffic on HTTP on the CSS, in this way you can use the same HTTP content rule which is the one currently working.
In summary, you will have an SSL content rule that will decrypt the traffic, and this one will use the same content rule that already exist for HTTP, in case that the server is the one doing the redirect to SSL, but this is something that requires testing since depending on the redirect behavior we might have a redirect loop, but without details it is kind of hard to confirm that you will face this with this option.
Another option, which is less complex, is to use a portless content rule, so this content rule will match port 443 and 80 at the same time, and using sticky or balance based on source IP, you will get the same result with less config. The downside is the troubleshooting, but in this way you will have what you want.
content HTTP-HTTPS
    vip address 10.198.44.70
    advanced-balance sticky-srcip
    add service server1
    add service server2
    add service server3
    add service server4
    add service server5
    protocol tcp
    active
Here the content rule is not looking for the destination port, it is just looking for the source IP, and HTTP and HTTPS will end all the time on the same server.
Thanks,
Rodrigo

CSS 11501 Load Balancing Issue

Hi,
We are facing some issue in load balancing in cisco CSS 11501 as we are not able to access the application through virtual IP. Below is the ruuning configuration of the CSS:
CSS11501# sh running-config
!Generated on 10/06/2010 16:51:34
!Active version: sg0810106
configure
!*************************** GLOBAL ***************************
ip route 0.0.0.0 0.0.0.0 132.186.199.1 1
!************************** CIRCUIT **************************
circuit VLAN1
ip address 132.186.199.145 255.255.255.0
!************************** SERVICE **************************
service Server1
ip address 132.186.199.243
port 5001
protocol tcp
keepalive port 5001
active
service Server2
ip address 132.186.199.246
protocol tcp
port 5001
keepalive port 5001
active
!*************************** OWNER ***************************
owner L5_Owner
content L3_Rule
    vip address 132.186.199.146
    protocol tcp
    port 5001
    add service Server1
    add service Server2
    active
content L5_Rule
    vip address 132.186.199.146
    add service Server1
    add service Server2
    protocol tcp
    port 5001
    url "//132.186.199.146:5001/emi"
    active
CSS11501#
Observation : We are able to telnet on VIP: 132.186.199.146 on port 5001, but not able to access the application.
In Actual scenarion customer access application by accessing URL: http://132.186.199.243:5001/emi and once he enter this URL in web browser the request redirects ( by server itself) to URL: https://132.186.199.44:6002/cas/login?service=http%3A%2F%2F132.186.199.243%3A5001%2Femi%2Findex.jsp&acceptStrength=BASIC on backend server for user authenticaton and once user is authenticated then it again redirect to main URL ( http://132.186.199.243:5001/emi ) to access the application but when we are trying to access the application through VIP ( URL: http://132.186.199.146:5001/emi) we are not getting the login page as the request is not gettting redirected to backend server for user authentication.
Please suggest a solution here.

The problem is that you are in one-armed mode.
So you need to configure client nat.
Without nating the client ip address, the server response goes back directly to the client and bypasses the CSS.
Therefore the client receives a response from an unknown server ip address (not the vip).
So configure a group.
For example
group Client
    vip address 132.186.199.146
    add destination service Server1
     add destination service Server2
    active
Also, remove the url command from your content rule.
It is useless in your case and will just make performance worst.
Gilles.

Sorry Server for CSS 11500

Hi,
I have a question regarding sorry server configuration on the CSS 11500 series.
Is there a way for the sorry server to ignore the URL path and always send the user traffic to the "root" page (e.g. index.html) of the sorry server web server?
The problem I have is the redirection of the "root" page (url "/") that is configured for the normal traffic is causing the sorry page not to work since the URL path ("/psp/CUSTOMER1/?cmd=login") does not exist on the sorry page web server:
service Sorry-Server
protocol tcp
port 8000
keepalive type tcp
ip address 192.168.2.254
active
service server1
ip address 192.168.2.101
protocol tcp
keepalive type tcp
port 8080
active
service server2
ip address 192.168.2.102
protocol tcp
keepalive type tcp
port 8080
active
owner Customer1
content Content1
    vip address 192.168.1.101
    port 80
    protocol tcp
    url "/*"
    balance aca
    advanced-balance arrowpoint-cookie
    flow-timeout-multiplier 6
    add service server1
    add service server2
    primarySorryServer Sorry-Server
    active
content Content1-Redirect
    redirect "/psp/CUSTOMER1/?cmd=login"
    vip address 192.168.1.101
    port 80
    protocol tcp
    url "/"
    active
Thanks in advance for your help!
Best regards,
Harry

Hi again,
During a maintenance window I made the following change and that made things a bit better:
service Sorry-Server
type redirect
keepalive type none
redirect-string "192.168.2.254:8000"
active
However, since the redirect string points to a private address, Internet users are not able to access the URL.
As a work-around I sent the redirect to a new content rule with a public address and then configured a second sorry page server:
service Sorry-Server
type redirect
keepalive type none
redirect-string "sorry.example.com:8000"
active
service Sorry-Server-2
ip address 192.168.2.254
protocol tcp
port 8000
keepalive type tcp
active
owner Customer1
content Content2
    vip address x.x.x.x
    add service Sorry-Server-2
    port 8000
    protocol tcp
    active
Is there a better way to do this?
Best regards,
Harry

CSS and a Sorry Server

I have been trying to get my CSS 11506 to redirct to a Sorry Server when our content servers go offline. We thought that we had it working, but after some downtime it turned out that our configuration did not work.
After extensive reading I can't figure out what is wrong with my config, or if the problem lies else where. I am attaching my config below, can anyone tell me if they see any problems with what I have or if there is something that I need to do in addition to what I have. Thank you for you help, here is the config:
*************************** GLOBAL ***************************
no restrict web-mgmt
no restrict xml
bypass persistence disable
snmp community ******read-write
snmp name "******"
snmp contact "*******r"
snmp location "CSS11056"
snmp trap-host 10.20.1.4 ******
dns primary 10.20.1.2
ftp-record ******10.20.1.17 *** des-password
ibfebcgg6aheuc4h1hfcqhpcubwdxcjb cssgui
ip route 0.0.0.0 0.0.0.0 10.20.1.1 1 !
*************************INTERFACE*************************
interface 1/1
phy 1Gbits-FD-sym !
**************************CIRCUIT**************************
circuit VLAN1
router-discovery lifetime 1000
ip address 10.20.1.4 255.255.255.0
router-discovery
**************************SERVICE**************************
service Blade01
ip address 10.20.1.60
active
service Blade02
ip address 10.20.1.61
active
service Blade03
ip address 10.20.1.62
active
service Blade04
ip address 10.20.1.63
active
service sorry
ip address 10.20.1.41
active
!*************************** OWNER***************************
owner ***
email-address ******
content Content1
vip address 10.20.1.80
balance aca
add service Blade01
add service Blade02
no persistent
primarySorryServer sorry
active
content Content2
vip address 10.20.1.81
add service Blade03
add service Blade04
balance aca
active
!*************************** GROUP***************************
group content1nat
vip address 10.20.1.80
add destination service Blade01
add destination service Blade02
add destination service sorry
group content2nat
add destination service Blade03
add destination service Blade04
vip address 10.20.1.81
!**************************** ACL ****************************
acl 10
clause 5 permit any 10.20.1.60 destination content ****
sourcegroup ****
clause 6 permit any 10.20.1.61 destination content ICC/flippid
sourcegroup Content1
clause 99 permit any any destination any
clause 2 permit any 10.0.0.0 destination content ****
sourcegroup ****
apply circuit-(VLAN1)
clause 7 permit any 10.20.1.41 destination content ****
sourcegroup Content1

One problem I can see is that you don't have any keepalives configured under the services, so they will default to a Ping. As long as they respond to ping, it will keep traffic going to those servers.
What services run on these Servers? We generally recommend you use as higher layer keepalive as possible, so if it is a web server for example, use a HTTP keepalive.
Have a look here for more info:
http://www.cisco.com/en/US/docs/app_ntwk_services/data_center_app_services/css11500series/v8.10/configuration/content_lb/guide/KAL.html

CSS Sorry Server for HTTPS

How to configure Sorry server for HTTPS (443) port. Sorry server works fine with HTTP, But not with 443
In the following config if server1 and server2 are down, the HTTP requests goes to the Sorry Server, but for HTTPS nothing is displayed. I am running the sorry server on port 81
Please suggest
!************************** SERVICE **************************
service prisorry
ip address 10.100.11.11
keepalive type http
keepalive port 81
port 81
active
service secsorry
ip address 10.100.11.12
keepalive port 81
keepalive type http
port 81
active
service server1
ip address 10.100.11.11
keepalive type http
keepalive port 80
active
service server2
ip address 10.100.11.12
keepalive type http
keepalive port 80
active
!*************************** OWNER ***************************
owner Loadbalancing
content L4Rule1
protocol tcp
add service server2
add service server1
port 80
url "/*"
vip address 10.100.11.4
advanced-balance sticky-srcip-dstport
primarySorryServer prisorry
secondarySorryServer secsorry
active
content L4Rule2
protocol tcp
add service server2
port 443
add service server1
vip address 10.100.11.4
advanced-balance sticky-srcip-dstport
primarySorryServer prisorry
secondarySorryServer secsorry
application ssl
active
content L4Rule3
add service server2
protocol tcp
port 1443
add service server1
vip address 10.100.11.4
advanced-balance sticky-srcip-dstport
primarySorryServer prisorry
secondarySorryServer secsorry
active
Thanks

I just deployed a couple 11050's the other day so my experience is limited, but I'd guess your problem is that, when using the Primary Sorry Server, you end up with clients sending HTTPS requests to an HTTP port. Having HTTPS requests redirected to HTTP ports is one thing because the client then makes an HTTP request to that port, but the way you have it above, it appears to me that the client will be talking HTTPS to port 81 on the Sorry Server, which is listening for HTTP.

CSS Sorry server requirements

Folks,
The documentation says that the sorry server concept will only work if the loadbalancing is done at layer 7. My question is why, why can't i see the sorry server redirect if all services are down when doing load balancing at Layer 3 or Layer 4?

Hi,
Can you point me to those docs. I believe sorry server should work regardless of which layer is the content rule configured to check.
Actually this doc's example is layer 3:
http://www.cisco.com/en/US/products/hw/contnetw/ps789/products_configuration_example09186a0080093de8.shtml
I will build a working config at layer 3 for you soon.

CSS 11051: Sorry Server receives request although the normal server is up

Hello,
my customer has configured a sorry for his server. If the normal server is down the Sorry Server receives the requests. That works fine. But if the normal server comes back the Sorry Server still receives some requests( 2 hours and more). Has anybody an idea what might be the reason for that ?
regards
Dietrich Schleyer
content webserver
add service server12
vip address 10.40.52.20
primarySorryServer server13
protocol tcp
port 80
url "/*"
no persistent
active
service server12
ip address 10.40.52.12
port 80
protocol tcp
keepalive type named applicationwww01
active
service server13
ip address 10.40.52.13
protocol tcp
port 80
keepalive type named applicationwww02
active
keepalive applicationwww01
ip address 10.40.52.12
port 80
type http non-persistent
uri "/test.html"
frequency 10
method get
active
keepalive applicationwww02
ip address 10.40.52.13
port 80
uri "/test.html"
frequency 10
method get
type http non-persistent
active

According to: http://www.cisco.com/warp/public/117/css_sorry_server.html After the CSS 11000 directs requests to a primary sorry server, the switch will continue to use the primary sorry server even when the original server becomes functional. To force the connection back to the original server, you must suspend the primary sorry server or wait until the connection is dropped or times out. When a new session is initiated by the CSS 11000, the connection should go back to the original server.

NAT and Servers behind CSS 11501

All,
Please forgive my asking this question again. I was injured shortly after asking the last time and out of work for a long period of time.
My problem stems from needing to allow my web servers to initiate traffic to the outside world from behind our CSS boxes.
The web servers sit behind a pair of CSS 11501 content switches in Active-Passive ASR with fate sharing. We are only interested at this time with load balancing HTTP and HTTPS.
Everything works inbound no problem.
What I need to do is setup some type of NAT for my 3 web servers to initiate HTTP/HTTPS for patches, send SMTP from the web apps, and initiate HTTPS for credit card validation.
I have setup NAT on PIX units and routers no problem, but I seem to be unable to do it on these boxes. :(
In reality something as simple as a PAT translation on the outside of the CSS boxes should be sufficient.
Is this possible with our setup? Does anyone have some code examples?
Thanks in advance.
Addresses changed to protect the innocent:
Load Balancer 1:
!*************************** GLOBAL ***************************
bridge spanning-tree disabled
sntp server 1.1.1.41 version 1
snmp community noway read-only
snmp community noway read-write
app session 1.1.1.252
app
logging subsystem netman level info-6
dns primary 2.2.2.41
dns secondary 2.2.2.42
ip route 0.0.0.0 0.0.0.0 1.1.1.1 1
!************************* INTERFACE *************************
interface e1
phy 100Mbits-FD
description "Connect to Primary DMZ 1 3550 Switch"
interface e2
bridge vlan 2
phy 100Mbits-FD
description "Connected to Primary LB Server Switch"
interface e8
description "Inter Switch Communication (ISC) Port"
isc-port-one
!************************** CIRCUIT **************************
circuit VLAN1
description "DMZ 1 Subnet (1.1.1.x/24)"
ip address 1.1.1.251 255.255.255.0
ip virtual-router 1 priority 254 preempt
ip redundant-interface 1 1.1.1.250
ip redundant-vip 1 1.1.1.161
ip redundant-vip 1 1.1.1.162
ip redundant-vip 1 1.1.1.70
ip redundant-vip 1 1.1.1.71
ip redundant-vip 1 1.1.1.72
ip critical-service 1 upstream_downstream
circuit VLAN2
description "Load Balanced Servers Subnet"
ip address 2.2.2.2 255.255.255.0
ip virtual-router 2 priority 254 preempt
ip redundant-interface 2 2.2.2.1
ip critical-service 2 upstream_downstream
Various Services, Owners and Content
Load Balancer 2:
!*************************** GLOBAL ***************************
bridge spanning-tree disabled
sntp server 1.1.1.41 version 1
snmp community noway read-only
snmp community noway read-write
app session 1.1.1.251
app
logging subsystem netman level info-6
dns primary 2.2.2.41
dns secondary 2.2.2.42
ip route 0.0.0.0 0.0.0.0 1.1.1.1 1
!************************* INTERFACE *************************
interface e1
phy 100Mbits-FD
description "Connect to Secondary DMZ 1 3550 Switch"
interface e2
bridge vlan 2
phy 100Mbits-FD
description "Connected to Secondary LB Server Switch"
interface e8
description "Inter Switch Communication (ISC) Port"
isc-port-one
!************************** CIRCUIT **************************
circuit VLAN1
description "DMZ 1 Subnet (1.1.1.x/24)"
ip address 1.1.1.252 255.255.255.0
ip virtual-router 1
ip redundant-interface 1 1.1.1.250
ip redundant-vip 1 1.1.1.161
ip redundant-vip 1 1.1.1.162
ip redundant-vip 1 1.1.1.70
ip redundant-vip 1 1.1.1.71
ip redundant-vip 1 1.1.1.72
ip critical-service 1 upstream_downstream
circuit VLAN2
description "Load Balanced Servers Subnet"
ip address 2.2.2.3 255.255.255.0
ip virtual-router 2
ip redundant-interface 2 2.2.2.1
ip critical-service 2 upstream_downstream
Various Services, Owners and Content.

Gilles,
I added the following commands, and things seem to be working.
To circuit VLAN1
ip redundant-vip 1 1.1.1.80
!*************************** GROUP ***************************
group natout
vip address 1.1.1.80
add service nat_web_servers
active
service nat_web_servers
ip address 192.168.1.10 range 3
active
I do have a question about the above service commands.
I have 3 servers behind the CSS. Let's call them 192.168.1.10, 192.168.1.11 and 192.168.1.12. Am I correct in my thinking that adding range 3 then allows a match on all 3 of those servers and the CSS will then PAT these servers from the VIP address assigned to the group?
Otherwise, I think you have resolved this problem for us. Thank you.

CSS 11501 - Network reconnection issue

Using a CSS 11501 switch to configure both Load balancing and server hot standby between two servers (of same config). Clients are connecting to the server using tcp/ip sessions.
The configuration used is shown below:
=========================================
configure
ip route 0.0.0.0 0.0.0.0 10.167.50.1 1
!************************* INTERFACE
interface e2
bridge vlan 9
interface e3
bridge vlan 9
!************************** CIRCUIT
circuit VLAN1
ip address 10.167.50.108 255.255.254.0
circuit VLAN9
ip address 10.167.70.1 255.255.254.0
!************************** SERVICE
service abc_service1
ip address 10.167.70.2
protocol tcp
port 6300
keepalive type tcp
active
service abc_service2
ip address 10.167.70.3
protocol tcp
port 6300
keepalive type tcp
active
!*************************** OWNER
owner xxxxx
content abc_crule
vip address 10.167.50.109
add service abc_service1
add service abc_service2
protocol tcp
port 6300
balance aca
active
===============================
We conducted three tests to verify the hot standby while client sending the data to server app thro tcp/ip.
1) Brought down the service on one server 2) Restarted the OS (Windows 2003) on one server 3) Removed a network cable of one of the server connecting to CSS.
client app lost the conn to the service/server, but when it tried reconnecting to the alternate server, it was successful.
CSS status reflected the actual status of the service/server.
But in third test (removing network conn) the service state changed from "Alive" to "Down" and client app lost conn to the server. Client app tried reconnecting and it was successful connecting to the alternate server.
But when we connected the network cable back, the CSS state was continue to be in "Down". Also,the network connection between CSS and server was not available after reconnection. Also, the status of alternate server changed to "Down", but still client app was successfully transmitting to the alternate server. Stopping the client app and tried reconnecting,
the connection was not going thro.
The connection could be established between CSS and server boxes only after restarting the OS(running windows 2003).
Issues:
1. Service status in CSS continue to be down even after reconnecting the cable with the service running.
2. CSS status of the first service also went down after reconnecting the other server.
3. Client app could not reconnect to any of the servers.
Are we missing any configuration parameter in CSS which will address the above?
regards
Param

Param,
what software version for the CSS ?
Did you see an ARP entry on the server for the CSS ?
Did you see an ARP entry on the CSS for the server ?
is the server directly connected to the CSS or is there an L2 switch inbetween ?
Could you configure 'bridge spanning-tree disabled' on the CSS and see if this improves the situation.
Regards,
Gilles.

Sorry server - different replies

We have CSS 11000 that provides load balancing between several servers with configured max-session .
How to configure that sorry server sends different reply:
1) if all servers are down, it has redirect to page "sorry, server is down"
2) in case of overload, it it has to redirect to page "sorry, server is bussy, try later"
Can you advise how it possible to configue this?
thanks in advance,
Natalia

there is no direct way of doing this.
However, my solution is to do this :
service sorry_down
service sorry_overloaded
keepalive type script check_service_down use-output
owner mycompany
content www
vip ...
add service ...
primarysorryserver sorry_overloaded
secondarysorryserver sorry_down
active
The script check_service_down, will do a 'show service ' grep -u Alive to detect if a service is alive or just not used because down.
Or you could also simply do ap-kal-pinglist and ping the services.
Anyway, the idea for the kal for the service sorry_overloaded is to check the status of the other services and detect if they are down or just overloaded.
Gilles.

CSS 11501 - Balancing vs. Sorry Server

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