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Community Member

Redirection class overlap on policy-map

Hello.

I was asked to implement some rules and one of them is overlaping the other I think becasue is shorter and it´s using the regular expression .*

Regarding the configuration below I always get redirected to http://SITE1 instead of http://SITE2 when I type www.AAA/fr/pages/AAA/index.php because the class REDIRECT_NM_LORO_PMUR_CLASS always win even it´s in the bottom of the policy-map.

Is there some way to order the classes in a policy-map to act as an  access-list does? (from the top to the bottom and stop looking up when a  match is found), In other words, make the class REDIRECT_PMUR_RAPPORTS_CLASS is done before REDIRECT_NM_LORO_PMUR_CLASS

which is more generic.

Config example:

rserver redirect REDIRECT_PMUR

  webhost-redirection http://SITE1 301

  inservice

rserver redirect REDIRECT_PMUR_RAPPORTS

  webhost-redirection http://SITE2 301

  inservice

rserver redirect REDIRECT_PMUR_RESULTATS

  webhost-redirection http://SITE3 301

  inservice

serverfarm redirect REDIRECT_NM_LORO_PMUR_FARM

  rserver REDIRECT_PMUR

    inservice

serverfarm redirect REDIRECT_PMUR_RAPPORTS_FARM

  rserver REDIRECT_PMUR_RAPPORTS

    inservice

serverfarm redirect REDIRECT_PMUR_RESULTATS_FARM

  rserver REDIRECT_PMUR_RESULTATS

    inservice

class-map type http loadbalance match-any REDIRECT_NM_LORO_PMUR_CLASS

  4 match http url /fr/pages.*

class-map type http loadbalance match-any REDIRECT_PMUR_RAPPORTS_CLASS

  3 match http url www.AAA/fr/pages/AAA/index.php

class-map type http loadbalance match-any REDIRECT_PMUR_RESULTATS_CLASS

  3 match http url www.BBB/fr/pages/BBB/index.php

policy-map type loadbalance first-match POLICY_REDIRECT_NM_LORO_CAT2_FARM

  class REDIRECT_PMUR_RESULTATS_CLASS

    serverfarm REDIRECT_PMUR_RESULTATS_FARM

  class REDIRECT_PMUR_RAPPORTS_CLASS

    serverfarm REDIRECT_PMUR_RAPPORTS_FARM

  class REDIRECT_NM_LORO_PMUR_CLASS

    serverfarm REDIRECT_NM_LORO_PMUR_FARM

  class class-default

    serverfarm NM_LoRo_CAT2_FARM

Thank you very much,

Miquel

3 REPLIES
Cisco Employee

Redirection class overlap on policy-map

Hi Miquel,

This is what it seems is happening. Your class-map condition is based on URL and not host-header value so ACE is not even considering www.AAA or www.BBB. It is only looking for fr/pages/xxxxxxxx which only matches 3rd class map and that's why you get the match and hence the corresponding redirection.

Can you try using class map condition based on Host ?

switch/Admin(config-cmap-http-lb)# 2 match http header Host header-value ?

Please try and let me know how it goes.

You can also test my removing that /fr/pages/.* condition and see if it matches or not as well.

Regards,

Kanwal

Cisco Employee

Redirection class overlap on policy-map

Hi Miquel,

Also, When matching data strings, note that the period (.) and question mark (?) characters do not have a literal meaning in regular expressions. Use brackets ([ ]) to match these symbols (for example, enter www[.]xyz[.]com instead of www.xyz.com). You can also use a backslash (\) to escape a dot (.) or a question mark (?). Try this as well in your class-map condition and see if it makes a difference.

Regards,

Kanwal

Community Member

Redirection class overlap on policy-map

Hi Fnu.

I can´t use the header because I need to match a specific piece of url, for example, using the url

www.hello.com/folder/subfolder/index.php, the request is:

-All that explicitely contains whatever hello.com/folder/subfolder whatever have to go to site 1

-Anything starting with whatever hello.com have to go to site 2

So I think the ideal sollution for matching woud be to use the URL BUT having the ability to choose what class will be the first to trigger in the policy-map as an access-list does.

Thank you!

Miquel

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