ACE module rservers multiple routed hops away

Hi all, deploying a ACE module in a cat6k. Just want to figure out, can I add to a serverfarm, rservers which are multiple routed hops away from the ACE or the cat6k in which it is deployed. please look at the attached diagrams. I have my servers at two subnets, and I want to add all 5 servers to the same server farm and load balance between them
Is this possible, if any what are the caveats ?
Thanks all

Hi,
You can do this, but ypu have to use client-NAT to force the return traffic to pass back through the ACE. You also then need static routes in the ACE context to point at each server.
The following extract from a configuration shows the basic principle:
rserver host master
ip address 10.199.95.2
inservice
rserver host slave
ip address 10.199.38.68
inservice
serverfarm host FARM-web2-Master
description Serverfarm Master
probe PROBE-web2
rserver master
inservice
serverfarm host FARM-web2-Slave
description Serverfarm Slave
probe PROBE-web2
rserver slave
inservice
class-map match-any L4VIPCLASS
2 match virtual-address 10.199.80.12 tcp eq www
3 match virtual-address 10.199.80.12 tcp eq https
policy-map type management first-match REMOTE-MGMT-ALLOW-POLICY
class REMOTE-ACCESS
permit
policy-map type loadbalance first-match LB-POLICY
class class-default
serverfarm FARM-web2-Master backup FARM-web2-Slave
policy-map multi-match L4POLICY
class L4VIPCLASS
loadbalance vip inservice
loadbalance policy LB-POLICY
loadbalance vip icmp-reply active
loadbalance vip advertise
nat dynamic 1 vlan 384
service-policy input L4POLICY
interface vlan 383
description ACE-web2-Clientside
ip address 10.199.80.13 255.255.255.248
alias 10.199.80.12 255.255.255.248
peer ip address 10.199.80.14 255.255.255.248
access-group input ACL-IN
access-group output PERMIT-ALL
no shutdown
interface vlan 384
description ACE-web2-Serverside
ip address 10.199.80.18 255.255.255.240
alias 10.199.80.17 255.255.255.240
peer ip address 10.199.80.19 255.255.255.240
access-group input PERMIT-ALL
access-group output PERMIT-ALL
nat-pool 1 10.199.80.20 10.199.80.20 netmask 255.255.255.240 pat
no shutdown
ip route 0.0.0.0 0.0.0.0 10.199.80.9
ip route 10.199.95.2 255.255.255.255 10.199.80.21
ip route 10.199.38.68 255.255.255.255 10.199.80.21
HTH
Cathy

Similar Messages

ACE Module Routed design

Hi all,
I have a requirement to install 2 ACE Modules into two 6509 chassis'
We want to run the ACE modules in a live/live scenario so we can utilise the two ACE modules
So we want to split the VIPS so we have some live on one ACE and others on the other.
Also the ACE modules will be setup in routed mode. We have a number of subnets we want to use on the client side - 3 to be exact, and there will be another 3 different subnets on the server side
A few points which are confusing me
For each subnet would i have to configure a SVI? And if so you can only have 1 SVI per contect so that would mean creating a context and a SVI for each subnet?
Are there any example configs which could help me out?
Any help would be appreciated
Thanks
James

See the config example here:
http://www.cisco.com/en/US/products/hw/modules/ps2706/products_configuration_example09186a00809c3048.shtml
Normally you only need one client-side subnet per context, but multiple ones work too.
You'd create an SVI on MSFC for the client-side subnets only, otherwise server traffic would bypass the ACE.
Also keep in mind when you do active/active, it's done on the context level.
That means you need to create at least two contexts in addition to the Admin context. (although you can technically run things in /Admin)
Go through the example above, and the config guides below and you'll be all set:
http://www.cisco.com/en/US/products/ps6906/tsd_products_support_model_home.html

ACE module routed mode

Hi,
I have a scenario where I have a pair of 6509 switches and I need to add an ACE module on both of them. All clients Default gateway are on internal 5580 ASAs so there are no SVI interfaces on the 6509 switches, it's only doing layer 2 switching.
I need to add an ACE module to the above setup, what's the ideal scenario in terms of routing without having to modify and add SVIs on the 6509?
Regards

http://docwiki.cisco.com/wiki/Basic_Load_Balancing_Using_One_Arm_Mode_with_Source_NAT_on_the_Cisco_Application_Control_Engine_Configuration_Example
http://www.cisco.com/en/US/docs/interfaces_modules/services_modules/ace/vA2_3_0/configuration/getting/started/guide/one_arm.pdf

Per-ServerFarm SNAT on ACE Module.

Dear all,
I hace an ACE Module configured in Multiple Routed Contexts.
My cust wants to configure some NAT Feature that prevents the real server IP Address appear outside the ACE. They want that the only IP address outside the ACE will be the Virtual IP Adress (VIP) that represents the serverfarm.
Also, the cust wants that different serverfarms comunicate each other within the same VLAN.
I was reading and the option that acomplish both tasks is Dynamic (PAT) Per-ServerFarm SNAT using the VIP address.
Is this correct?
The software version is A2(3,5).
Thanks a lot!
David

Hi David
Could you please calrify and maybe separate tasks you have ?
As I understand you have such tasks for now :
1) Don't show rserver IPs anywere outside ACE
2) Servers in the same VLAN should be able to communicate with serverfarm which is located in the same VLAN via VIP
First task is a little bit unclear. I mean - actually you have VIP outiside of ACE and all outiside clients communicate to serverfarm via VIP and don't need to know rserers IPs (e.g. they can even be private and VIP is public, if we're talking about Internet)
Or do you mean that rservers need to communicate with outside world through ACE but you want to NAT these flows too ?
2) Yes, it's possible. For such configuration you need to create a service policy, with the same VIP and configuration as you have for outside interface and put it on inside interface. The only one key difference is that you need to add NAT statement , because return traffic should go to ACE and as rservers and clients in this case are in the same VLAN, you need to use NAT.
E.g.
policy-map multi-match VIP_IN
class MY-CLASS
loadb vip ins
loadb policy MY-L7Policy
nat 1 dynamic vlan X << - inside interface
and then on inside interface
inter vlan X
nat-pool 1Y.Y.Y.Y netmask 255.255.255.255 pat
In this case it will work in this way : say you have servers in vlan 10. Servers #1 and #2 are rservers in your serverfarms and server #3 wants to connect to serverfarm through VIP. Let's say that vlan 10 has subnet 10.0.0.0/24 and VIP for this serverfarm is 8.8.8.8. When you confiure like I wrote above this will happen :
Server #3 connects to 8.8.8.8, traffic goes to ACE as a gateway, as you have a policy map on inside interface which catches traffic to 8.8.8.8 , ACE will catch it an proceed it. You have a SNAT statement there, so ACE will perform standard loadblanacing and replace source IP with NAT IP (say 10.0.0.100) , thus when server #1 which gets this loadbalanced traffic receives it , it will send return traffic to 10.0.0.100 , thus to ACE.

Reuse of context in ACE module

Hi all, just have a question about som reuse of resources in a ACE module context. I don't want to make a new context, and can reuse most of the existing configuration in one of my context. The config is not complex and difficult, but I'm not sure if I can do this.
The primary goal is to loadbalance 2 webservers with a new vip, new serverfarm, stickygroup, policy-map and different nat-pool.
Since I haven't decided the ip addresses to be used, they are just xx in the config below.
The changes I want to implement are in bold. Will this work for me?
probe http WEBGUI_D2
description Probe for http mot webgui
interval 10
passdetect interval 10
passdetect count 1
request method get url /D2/auth/login.aspx
expect status 200 302
header User-Agent header-value "IDENTITY"
rserver host cwi003
description content server logon
ip address 10.163.22.27
inservice
rserver host cwi004
description content server logon
ip address 10.163.22.28
inservice
rserver host cwi503
description content server logon 2
ip address 10.163.22.23
inservice
rserver host cwi504
description content server logon 2
ip address 10.163.22.24
inservice
serverfarm host SF_LOGON_D2
probe WEBGUI_D2
rserver cwi003 80
   inservice
rserver cwi004 80
   inservice
serverfarm host SF_LOGON2_D2
probe WEBGUI_D2
rserver cwi503 80
   inservice
rserver cwi504 80
   inservice
sticky ip-netmask 255.255.255.255 address source STICKYGROUP1
timeout 20
replicate sticky
serverfarm SF_LOGON_D2
serverfarm SF_LOGON2_D2
class-map match-all VS_LOGON_D2
3 match virtual-address 10.163.22.13 any
class-map match-all VS_LOGON2_D2
3 match virtual-address 10.163.22.xx any
policy-map type loadbalance first-match PM_ONE_ARM_LB
class class-default
   sticky-serverfarm STICKYGROUP1
policy-map multi-match PM_ONE_ARM_MULTI_MATCH
class VS_LOGON_D2
   loadbalance vip inservice
   loadbalance policy PM_ONE_ARM_LB
   nat dynamic 5 vlan 1240
class VS_LOGON2_D2
   loadbalance vip inservice
   loadbalance policy PM_ONE_ARM_LB
   nat dynamic 6 vlan 1240
interface vlan 1240
description Client_server
ip address 10.163.22.11 255.255.255.0
peer ip address 10.163.22.12 255.255.255.0
access-group input INBOUND
nat-pool 5 10.163.22.14 10.163.22.17 netmask 255.255.255.192 pat
nat-pool 6 10.163.22.xx 10.163.22.xx netmask 255.255.255.192 pat
service-policy input PM_ONE_ARM_MULTI_MATCH
no shutdown
ip route 0.0.0.0 0.0.0.0 10.163.22.1
BR
Geir

Thanks for your reply.
Hope I understand you correct. This sould be the config I need to paste into the existing context.
rserver host cwi503
description content server logon 2
ip address 10.163.22.23
inservice
rserver host cwi504
description content server logon 2
ip address 10.163.22.24
inservice
serverfarm host SF_LOGON2_D2
probe WEBGUI_D2
rserver cwi503 80
    inservice
rserver cwi504 80
    inservice
sticky ip-netmask 255.255.255.255 address source STICKYGROUP2
   timeout 20
   replicate sticky
   serverfarm SF_LOGON2_D2
class-map match-all VS_LOGON2_D2
   3 match virtual-address 10.163.22.xx any
policy-map type loadbalance first-match PM_ONE_ARM_LB2
class class-default
    sticky-serverfarm STICKYGROUP2
policy-map multi-match PM_ONE_ARM_MULTI_MATCH
class VS_LOGON2_D2
    loadbalance vip inservice
    loadbalance policy PM_ONE_ARM_LB2
    nat dynamic 6 vlan 1240
interface vlan 1240
nat-pool 6 10.163.22.xx 10.163.22.xx netmask 255.255.255.192 pat
Br
Geir

ACE module - Qos - set ip tos #

All,
Trying to mark traffic to/from L4 rules in the ACE.
Documentation (like always) says it's really easy. Mark traffic by using the "set ip tos <value>" command in Policy/Class configuration. Ok, so I do this, set ip tos 24.
Enable qos globally on the 6500 host, but don't see the traffic being marked.
sh mls qos says that packets are being modified by module 5 (ACE)
But I never see the tos value in any of my captures either via netflow from the host 6500, or at the firewall one hop away.
sh mls qos:
QoS is enabled globally
Policy marking depends on port_trust
QoS ip packet dscp rewrite enabled globally
Input mode for GRE Tunnel is Pipe mode
Input mode for MPLS is Pipe mode
QoS Trust state is CoS on the following interface:
Te3/1
QoS Trust state is DSCP on the following interface:
Gi2/3
Vlan or Portchannel(Multi-Earl) policies supported: Yes
Egress policies supported: Yes
----- Module [5] -----
QoS global counters:
    Total packets: 207147888661
    IP shortcut packets: 0
    Packets dropped by policing: 0
    IP packets with TOS changed by policing: 2663386
    IP packets with COS changed by policing: 4889352
    Non-IP packets with COS changed by policing: 0
    MPLS packets with EXP changed by policing: 0
Can someone explain to me what I've got wrong here? Is the ACE simply marking traffic destined for the servers behind it and not the return traffic? Am I missunderstanding something?

Well... hopefully someone knows how to classify traffic coming from the ACE.
I've given up on using the ACE to mark traffic as I'm fairly certain it won't do it. At least not the way I want.
However, now I've taken to marking ingress on the rserver switch ports... which has resulted in a partially sucessful solution. Problem is, "partially" successful.
You'll have a bunch of little conversations like this with no tos value full of push-acks:
10:29:53.527526 207.161.222.68.2828 > 205.200.114.228.http: P 2954:3455(501) ack 203152 win 65535 (DF)
10:29:53.527698 205.200.114.228.http > 207.161.222.68.2828: . ack 3455 win 32267
10:29:53.555271 207.161.222.68.2828 > 205.200.114.228.http: P 3455:3686(231) ack 203152 win 65535 (DF)
10:29:53.562676 205.200.114.228.http > 207.161.222.68.2828: P 203152:203784(632) ack 3686 win 32768
10:29:53.674758 207.161.222.68.2828 > 205.200.114.228.http: P 3686:4036(350) ack 203784 win 64903 (DF)
10:29:53.690853 205.200.114.228.http > 207.161.222.68.2828: P 203784:205244(1460) ack 4036 win 32768
10:29:53.690863 205.200.114.228.http > 207.161.222.68.2828: P 205244:206704(1460) ack 4036 win 32768
10:29:53.690871 205.200.114.228.http > 207.161.222.68.2828: P 206704:208164(1460) ack 4036 win 32768
10:29:53.690879 205.200.114.228.http > 207.161.222.68.2828: P 208164:209624(1460) ack 4036 win 32768
10:29:53.690887 205.200.114.228.http > 207.161.222.68.2828: P 209624:211084(1460) ack 4036 win 32768
10:29:53.690895 205.200.114.228.http > 207.161.222.68.2828: P 211084:212544(1460) ack 4036 win 32768
But then you'll see another conversation pop up with the correct markings
10:31:53.845287 205.200.114.228.http > 207.161.222.68.2828: . 32753:34213(1460) ack 1082 win 62808 (DF) [tos 0x48]
10:31:53.845298 205.200.114.228.http > 207.161.222.68.2828: . 34213:35673(1460) ack 1082 win 62808 (DF) [tos 0x48]
10:31:53.845306 205.200.114.228.http > 207.161.222.68.2828: . 35673:37133(1460) ack 1082 win 62808 (DF) [tos 0x48]
10:31:53.845313 205.200.114.228.http > 207.161.222.68.2828: . 37133:38593(1460) ack 1082 win 62808 (DF) [tos 0x48]
10:31:53.845321 205.200.114.228.http > 207.161.222.68.2828: . 38593:40053(1460) ack 1082 win 62808 (DF) [tos 0x48]
10:31:53.845328 205.200.114.228.http > 207.161.222.68.2828: . 40053:41513(1460) ack 1082 win 62808 (DF) [tos 0x48]
10:31:53.845335 205.200.114.228.http > 207.161.222.68.2828: . 41513:42973(1460) ack 1082 win 62808 (DF) [tos 0x48]
10:31:53.845343 205.200.114.228.http > 207.161.222.68.2828: . 42973:44433(1460) ack 1082 win 62808 (DF) [tos 0x48]
I think what's happening, is that the conversations full of the P-acks is the load balancer communicating directly with the client (i.e. LB pretending to be the server), whereas the marked traffic is "data only" which the load balancer isn't mangling (like it might/probably is doing with the p-acks) on it's way back to the client.
I also can't modify the configuration of the "virtual ten gig" interface that the 6500 uses as a connection to the ACE module, so can't mark traffic there either. And though I still have a couple of things to try, I don't believe I can do egress marking on a trunk from the 6500 either (connection to the firewalls).
So.... PLEASE... Anyone??? Ideas???

Simple SLB with the ACE Module

Hello,
i have some problems with a ACE module i am currently tesing.
I have a simple Serverfarm with two Servers.
But there seems to be some Problems with the Loadbalancing i not understand:
1) I use Round Robin, but the ACE seems to put me serval times to the same server. I notice this, because i have different content on both servers, also different URLs.
2) withz the show serverfarm statement the total connects do not increment.
switch/slb-c1# show serverfarm webfarm
serverfarm : webfarm, type: HOST
total rservers : 2
----------connections-----------
real weight state current total
---+---------------------+------+------------+----------+--------------------
rserver: web1
10.0.33.201:0 8 OPERATIONAL 0 0
rserver: web2
10.0.33.200:0 8 OPERATIONAL 0 0
switch/slb-c1# show service-policy L4_LB_VIP
Status : ACTIVE
Interface: vlan 300
service-policy: L4_LB_VIP
class: L4_VIP_CLASS
loadbalance:
L7 loadbalance policy: L7_SLB_POLICY
VIP Route Metric : 77
VIP Route Advertise : DISABLED
VIP ICMP Reply : ENABLED
VIP State: INSERVICE
curr conns : 0 , hit count : 15
dropped conns : 0
client pkt count : 10198 , client byte count: 420991
server pkt count : 23367 , server byte count: 34915173
I have attatched the Config.
Any Idea what is going on?

what version do you have ?
I would recommend to run the very recent A1.4.
This is something that really should work.
Gilles.

Cisco ACE Module with Bluecoat Cache Proxy, Transparent and spoofing client IP

Hello Dears,
I'm trying to implement Cache loadbalancing through Cisco ACE Module.
I have 2 Bluecoat cache proxies, when i do configure transparent proxy without spoofing client IP, everything work properly, but when I enable spoofing client IP (reflect client IP address), clients are not able to access internet, although they are going to cache servers, I can see their sessions.
I'm afraid that I have a problem in the returned traffic PBR.
can anyone help please.
Thanks

Hi Ibrahim
I ahve reviewed the config. The ACE config is all god but I do see some issue with the switch side. If you are doing ip spoofing, then "match ip address" in pbr should be the client ip address. However, what you did is ip address between the ACE and MSFC. Try to configure the test client ip address into the below access-list.
msfc---vlan 265---ACE--vlan 264----CE farm
interface vlan 265
description Interface_With_MSFC_SUBS_2_INTERNET
ip address 168.168.1.52 255.255.255.248
access-group input PERMIT_ALL
service-policy input L3L4_PM
no shutdown
ip route 0.0.0.0 0.0.0.0 168.168.1.50
ip access-list extended HSDPA_2_CACHE
permit tcp 168.168.0.0 0.0.255.255 any eq www <<<-- wrong
ip access-list extended Internet_2_CACHE
permit tcp any eq www 168.168.0.0 0.0.255.255 <<<---wrong
interface Vlan 265
description Interface_With_ACE
ip address 168.168.1.50 255.255.255.248
route-map INTERNET_2_HSDPA permit 10
description "PBR for Response HTTP Traffic"
match ip address Internet_2_CACHE
set ip next-hop 168.168.1.52
route-map HSDPA_2_INTERNET permit 10
match ip address HSDPA_2_CACHE
set ip next-hop 168.168.1.52
regards
Andrew

ACE and host static routes?

Hi,
Does an ACE context work with host static routes?
I've been trying to set up a context to load balance LDAP where the servers have IP addresses across multiple VLANs and I'm not allowed to change the IP addresses. I've tried bridging and routing configurations. The only case that works is where the server is a member of the server-side VLAN. I noticed a comment in the Routing manual page 2-2 is says that secondary IP addresses are not supported. Is a host static route equivalent to a secondary address.
Is it possible to achieve my goal.
Thank you
Cathy

The problem is most probably asymetric routing.
When the client connects to the vip, the ace module will forward the traffic to the server re-using the client ip address so that the server believes it is communicating directly with the client.
The response from the server is sent to the client.
Since there are routers inbetween, they route the traffic using the best path which is most probably not through the ACE module.
So the client receives a resposne from the server which it drops because it is expecting a response from the vip.
one easy solution is to perform client nat on the ACE blade.
interface vlan 395
nat-pool 1 128.243.253.188 128.243.253.188 netmask 255.255.255.248 pat
Then configure
policy-map multi-match L4POLICY
class L4VIPCLASS
nat dynamic 1 vlan 395
If it works after that, you'll now you had an asymetric routing issue.
You can then keep the client nat solution or investigate the asymetry.
Gilles.

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.

How to Virtual IP configuration in ACE module?

Hi,
I am in the process of configuring load balancing on ACE module but struggling to configure virtual IP address for ACE module.
I'm working on ACE30 module and using software version A5 (1.2). ACE module is in slot of Catalyst 6504 switch.
Can anybody please post the steps/commands to perform this activity? An early response would be appreciated.
Regards,
Rachit.

Hi Rachit,
Here is a basic configuration example:
access-list Allow_Access line 10 extended permit ip any any
rserver host test
ip address 10.198.16.98
inservice
rserver host test2
ip address 10.198.16.93
inservice
serverfarm host test
rserver test 80
    inservice
rserver test2 80
    inservice
sticky http-cookie test group2
cookie insert
serverfarm test
class-map match-all VIP
2 match virtual-address 10.198.16.122 tcp eq www
policy-map type loadbalance first-match test
class class-default
    sticky-serverfarm group1
policy-map multi-match clients
class VIP
    loadbalance vip inservice
    loadbalance policy test
    loadbalance vip icmp-reply active
    nat dynamic 1 vlan 112
interface vlan 112
ip address 10.198.16.91 255.255.255.192
access-group input Allow_Access
nat-pool 1 10.198.16.122 10.198.16.122 netmask 255.255.255.192 pat
service-policy input NSS_MGMT
service-policy input clients
no shutdown
ip route 0.0.0.0 0.0.0.0 10.198.16.65
Here is the configuration guide:
http://tools.cisco.com/squish/101AD
Cesar R

Client accessing a specific server under a vip ACE Module

Hi All,
I have a need to allow QA/developers to check updated appliactions on a particluar server.
Is there any way on an ACE blade to allow a client to access a particular server under a vip?
The ACE is configured in Routed mode and the version is A2.3.4.
Any help or pdf's would be much appreciated.
Thanks.
Jack.

Hi,
Thanks for the response.
I have one more query, that I would appreciate some assistance with.
If I have an exisitng serverfarm with 6 rservers in it, is there any way to direct a specific client to a specific server.
I understand in one respect that if they are all inservice this may not be possible, but I thought I would ask the question anyway.
Thanks again for the assistance.
Jack

Ace module dropping assymetric layer 2 connections

Hi we had a situation in where the ACE would randomly drop certain tcp connections, and all ICMP packets from a certain windows server. The server in question was using Transmit Load Balancing with Fault Tolerance.
The server has one Nic connected to Access switch1, and the other nic connected to Access switch2. Each access switch connects up to a pair of 6509's, which is active on Core1 on both switches.
I am guessing If the server sends on Nic 2, core1 knows it came in on the downstream trunk port to Switch2, it must reply to these packets based on the teamed mac of the layer 3 address(no idea who is arping for the destination - the ace?), and send them back out the downstream trunk port to switch1. The ace module is in transparent mode. When contacting a server on the other side of the ace, the ace drop packets that came from the second nic - and I am wondering how it "knows" that the return path is out of different downstream port. Does it share some kind of layer 2 RPF check with the 6500 ?
Please note there is no routing involved here. The destination server is just on another vlan on the same subnet, on the other side of the ace.

Bryan,
As long as the server replies back to the ACE the client should only be commmunicating with the VIP address in either of your two examples.
In your first example the flow will look like this.
client > VIP after the ACE client > rserver
the reply would be
rserver > client after the ACE VIP > rserver
In your second example using client nat it will look like this
Client > VIP After ACE Natpool > rserver.
the reply would be
rserver > Nat-pool after ACE VIP > client.
The ACE by default will always nat the vip to the server ip unless you use the command "transparent" under the serverfarm. When using this command we send the packet to the MAC address of the server leaving the destination IP of the VIP. The server would need to have the VIP address configured under the loopback interface.
Regards
Jim

Configuring FT on ACE Modules

Hi,
I am trying to configure FT on ACE modules, with the following commands
ft interface vlan 20
ip address 172.16.20.1 255.255.255.252
peer ip address 172.16.20.2 255.255.255.252
no shutdown
ft peer 1
heartbeat interval 300
heartbeat count 10
ft-interface vlan 20
ft group 1
peer 1
priority 150
associate-context Admin
inservice
The moment I enter the command 'ft interface vlan 20', it gives a prompt that 'interface vlan20 is not associated with ft', how do I resolve this ? Do I need to enable something ?

Hi have the following config which seems to be working fine for me... check your vlan20 interface is up
ft interface vlan 212
ip address 172.31.1.221 255.255.255.252
peer ip address 172.31.1.222 255.255.255.252
no shutdown
ft peer 1
heartbeat interval 300
heartbeat count 20
ft-interface vlan 212
ft group 2
peer 1
priority 50
peer priority 150
associate-context Admin
inservice
HQ-ACE1/Admin# sh int
vlan212 is up, administratively up
Hardware type is VLAN
MAC address is 00:23:5e:25:72:f1
Mode : routed
IP address is 172.31.1.221 netmask is 255.255.255.252
FT status is standby
Description:not set
MTU: 1500 bytes
Last cleared: never
Last Changed: Tue Sep 6 12:46:06 2011
No of transitions: 1
Alias IP address not set
Peer IP address is 172.31.1.222 Peer IP netmask is 255.255.255.252
Assigned from the Supervisor, up on Supervisor
     8654909 unicast packets input, 735611030 bytes
     1151150 multicast, 161 broadcast
     0 input errors, 0 unknown, 0 ignored, 0 unicast RPF drops
     13020418 unicast packets output, 1672055521 bytes
     0 multicast, 163 broadcast
     0 output errors, 0 ignored

CSS - Can a real server be several Layer-3 hops away from the VIP

Can a CSS11500 load balance and health check real servers that are several Layer-3 hops away from the VIP on the CSS. All documentation and examples always show the servers connected to the CSS as Layer-2
If yes are there any limitations using a CSS in this mode

Hi Bob,
from my point of view there are only some rules to be watched but it should be possible to do. One thing that MUST be: The outgoing interface towards the realserver MUST be used for the traffic that returns from the server afaik because of the CSS has to watch the flows. (can be easily done if u use a trunk as there is for the CSS afaik no difference if the traffic leaves on VLAN x and returns on VLANy unless both VLANs do connect on the same port).
The next thing that is a MUST is:
Routing has to ensure that the CSS is in the flow back from the servers and not bypassed. OR you have to do source-natting so that the server is thinking that the CSS is asking him something.
Regarding the monitoring there is no difference if you are using keepalive scripts for monitoring the service.
Hope that helps and answers your question...
Kind Regards,
Joerg

ACE module rservers multiple routed hops away

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