Re: Conditional Advertise

Hi John,

The continue doesn't work for advertise-map the IOS doesn't allow tihs. :).

Regards,
Sagar

On Sat, Aug 29, 2009 at 2:56 PM, Divin Mathew John
<divinjohn_at_gmail.com>wrote:

> For this u gotta use the CONTINUE Clause in route-maps
>
> Filtering Traffic Using Continue Clauses in a BGP Route Map
>
> Perform this task to filter traffic using continue clauses in a BGP route
> map. In Cisco IOS Release 12.3(2)T, 12.0(24)S, 12.2(33)SRB, and later
> releases, the continue clause was introduced into BGP route map
> configuration. The continue clause allows for more programmable policy
> configuration and route filtering and introduced the capability to execute
> additional entries in a route map after an entry is executed with
successful
> match and set clauses. Continue clauses allow the network operator to
> configure and organize more modular policy definitions so that specific
> policy configurations need not be repeated within the same route map.
Before
> the continue clause was introduced, route map configuration was linear and
> did not allow any control over the flow of a route map.
>
> In Cisco IOS Release 12.0(31)S, 12.4(4)T, 12.2(33)SRB, and later releases,
> support for continue clauses for outbound route maps was introduced.
> Route Map Operation Without Continue Clauses
>
> A route map evaluates match clauses until a successful match occurs. After
> the match occurs, the route map stops evaluating match clauses and starts
> executing set clauses, in the order in which they were configured. If a
> successful match does not occur, the route map "falls through" and
evaluates
> the next sequence number of the route map until all configured route map
> entries have been evaluated or a successful match occurs. Each route map
> sequence is tagged with a sequence number to identify the entry. Route map
> entries are evaluated in order starting with the lowest sequence number and
> ending with the highest sequence number. If the route map contains only set
> clauses, the set clauses will be executed automatically, and the route map
> will not evaluate any other route map entries.
> Route Map Operation with Continue Clauses
>
> When a continue clause is configured, the route map will continue to
> evaluate and execute match clauses in the specified route map entry after a
> successful match occurs. The continue clause can be configured to go to (or
> jump to) a specific route map entry by specifying the sequence number, or
if
> a sequence number is not specified, the continue clause will go to the next
> sequence number. This behavior is called an "implied continue." If a match
> clause exists, the continue clause is executed only if a match occurs. If
no
> successful matches occur, the continue clause is ignored.
> Match Operations with Continue Clauses
>
> If a match clause does not exist in the route map entry but a continue
> clause does, the continue clause will be automatically executed and go to
> the specified route map entry. If a match clause exists in a route map
> entry, the continue clause is executed only when a successful match occurs.
> When a successful match occurs and a continue clause exists, the route map
> executes the set clauses and then goes to the specified route map entry. If
> the next route map entry contains a continue clause, the route map will
> execute the continue clause if a successful match occurs. If a continue
> clause does not exist in the next route map entry, the route map will be
> evaluated normally. If a continue clause exists in the next route map entry
> but a match does not occur, the route map will not continue and will "fall
> through" to the next sequence number if one exists.
> Set Operations with Continue Clauses
>
> Set clauses are saved during the match clause evaluation process and
> executed after the route-map evaluation is completed. The set clauses are
> evaluated and executed in the order in which they were configured. Set
> clauses are executed only after a successful match occurs, unless the route
> map does not contain a match clause. The continue statement proceeds to the
> specified route map entry only after configured set actions are performed.
> If a set action occurs in the first route map and then the same set action
> occurs again, with a different value, in a subsequent route map entry, the
> last set action may override any previous set actions that were configured
> with the same set command unless the set command permits more than one
> value. For example, the set as-path prepend command permits more than one
> autonomous system number to be configured.
>
>
>
http://www.cisco.com/en/US/docs/ios/12_4t/ip_route/configuration/guide/t_brbe
xt.html#wp1061585
>
> On Sat, Aug 29, 2009 at 7:20 PM, S Malik <ccie.09_at_gmail.com> wrote:
>
>> Natraajan,
>> you are correct, ACL & Prefix-list under same clause don't go together.
>> Please see following link quoting example and I wrongly understood AND/OR
>> logic from there,
>>
>>
>>
http://books.google.com/books?id=-SM1Jeu07UYC&pg=RA1-PA273&lpg=RA1-PA273&dq=r
>>
>>
oute-map+logical+AND&source=bl&ots=w8TcsNnJHf&sig=jvVGIhjeOBFS6njdfBjFzn4cnyY
>>
>>
&hl=en&ei=fDGZSs_kAcuf8Qau8uSfBQ&sa=X&oi=book_result&ct=result&resnum=2#v=one
>>
page&q=route-map%20logical%20AND&f=false<http://books.google.com/books?id=-SM
1Jeu07UYC&pg=RA1-PA273&lpg=RA1-PA273&dq=r%0Aoute-map+logical+AND&source=bl&ot
s=w8TcsNnJHf&sig=jvVGIhjeOBFS6njdfBjFzn4cnyY%0A&hl=en&ei=fDGZSs_kAcuf8Qau8uSf
BQ&sa=X&oi=book_result&ct=result&resnum=2#v=one%0Apage&q=route-map%20logical%
20AND&f=false>
>>
>>
>> On Sat, Aug 29, 2009 at 9:28 AM, Anantha Subramanian Natarajan <
>> anantha.natarajan_at_gravitant.com> wrote:
>>
>> > Hi Scott,
>> >
>> > If I understand properly from you ,I tried that,it give an error
>> > mentioning u can't use the prefix-list and access-list on the same
>> route-map
>> > sequence as below
>> >
>> > *"% prefix-list and access-list can not co-exist in one route-map
>> > sequence"*
>> >
>> > Thanks
>> >
>> > Regards
>> > Anantha Subramanian Natraajan
>> >
>> > On Sat, Aug 29, 2009 at 8:25 AM, Scott Morris <smorris_at_ine.com>
>> wrote:
>> >
>> >> If they're the same TYPE (e.g. two ACLs) then the router will redo
>> things
>> >> for you onto the same line, making the logic an OR. Kind of obnoxious
>> if
>> >> you ask me. :)
>> >>
>> >> But if you do two DIFFERENT things (e.g. one prefix list and one ACL)
>> you
>> >> can have the AND logic working.
>> >>
>> >>
>> >>
>> >>
>> >> *Scott Morris*, CCIE*x4* (R&S/ISP-Dial/Security/Service Provider)
>> #4713,
>> >>
>> >> JNCIE-M #153, JNCIS-ER, CISSP, et al.
>> >>
>> >> JNCI-M, JNCI-ER
>> >>
>> >> evil_at_ine.com
>> >>
>> >>
>> >> Internetwork Expert, Inc.
>> >>
>> >> http://www.InternetworkExpert.com <http://www.internetworkexpert.com/><
>> http://www.internetworkexpert.com/>
>>
>> >>
>> >> Toll Free: 877-224-8987
>> >>
>> >> Outside US: 775-826-4344
>> >>
>> >>
>> >> Knowledge is power.
>> >>
>> >> Power corrupts.
>> >>
>> >> Study hard and be Eeeeviiiil......
>> >>
>> >>
>> >>
>> >>
>> >> S Malik wrote:
>> >>
>> >> One thing is sure that same line is O, when we assign two ACL under one
>> >> clause, it is shown in one line and treated as OR.
>> >>
>> >> On Sat, Aug 29, 2009 at 7:53 AM, Anantha Subramanian Natarajan
>> <anantha.natarajan_at_gravitant.com> wrote:
>> >>
>> >>
>> >>
>> >> Hi Sugar Can,
>> >>
>> >> Can you try inside the route-map as below
>> >>
>> >> Match ip address prefix-list <prefix-list1><prefix-list2>
>> >>
>> >> I think whenever we specify the match criteria on same line ,it is an
>> AND
>> >> operation
>> >>
>> >> Regards
>> >> Anantha Subramanian Natarajan
>> >>
>> >> On Sat, Aug 29, 2009 at 12:57 AM, Sagar Rane <sagar.ccie_at_gmail.com>
>> <sagar.ccie_at_gmail.com> wrote:
>> >>
>> >>
>> >>
>> >> Hi All,
>> >>
>> >> I have requirement where, bgp should check its bgp routing table for
>> two
>> >> routes eq (10.1.1.0/24 and 20.2.2.2/32) and only if both routes are
>> >> present,
>> >> it should originate a route advertisement of 192.168.10.0/24.
>> >>
>> >> I have tried advertise-map and exist map, but how can we used exist-map
>> >>
>> >>
>> >> to
>> >>
>> >>
>> >> check both the routes at the same time?
>> >>
>> >> Anyway how we can meet this requirement please let me know.
>> >>
>> >> Regards,
>> >> Sagar
>> >>
>> >>
>> >> Blogs and organic groups at http://www.ccie.net
>> >>
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>>
>>
>>
>>
>>
>>
>>
>
>
> --
>
>
> Anatole France <http://www.quotationspage.com/quote/27546.html> - "If
> fifty million people say a foolish thing, it is still a foolish thing."

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Received on Sat Aug 29 2009 - 15:08:55 ART