Re: Conditional Advertise

it would be awesome if you could just list out the methods (technologies
being used)

On Sun, Aug 30, 2009 at 1:11 AM, Narbik Kocharians <narbikk_at_gmail.com>wrote:

> There are few ways to do this, in the following i am showing you just 2
> ways:
> Try this, so if netw 1.0.0.0 and 11.0.0.0 are BOTH up, only then, network
> 2.0.0.0 should be advertised:
>
> The topology should be as follows:
> R1 -------- R2 -------- R3
>
> R1 is advertising 1.0.0.0/8 and 11.0.0.0/8
> R2 is advertising 2.0.0.0/8
>
> *Set up a boolean logic and identify network 1.0.0.0/8 and 11.0.0.0/8:*
> R2(config)#Track 1 list boolean *AND
> *R2(config-track)#object 2
> R2(config-track)#object 3
> R2(config-track)#track 2 ip route 1.0.0.0 255.0.0.0 reach
> R2(config-track)#track 3 ip route 11.0.0.0 255.0.0.0 reach
> *Setup a fake route and tie "Track 1" to the fake route and advertise the
> fake route in BGP:*
>
> R2(config)#ip route 200.1.1.1 255.255.255.255 null0 *track 1*
>
> R2(config)#router bgp 200
> R2(config-route-map)#Network 200.1.1.1 mask 255.255.255.255
>
> *Identify network 2.0.0.0/8 and the fake network:*
>
> R2(config)#ip prefix-list NET permit 200.1.1.1/32
> R2(config)#ip prefix-list NET2 permit 2.0.0.0/8
>
> *Configure a route-map called "Adv" and reference the prefix-list that
> references network 2.0.0.0/8:*
>
> R2(config)#route-map Adv permit 10
> R2(config-route-map)#match ip addr prefix NET2
>
> *Configure a route-map called "EXIST" and reference the prefix-list that
> references network 200.1.1.1/32 (The fake network):*
>
> R2(config-route-map)#route-map EXIST permit 10
> R2(config-route-map)#match ip addr prefix NET
>
> *Configure an advertise-map and an exist map:*
>
> R2(config-route-map)#router bgp 200
> R2(config-router)#neigh 10.1.23.3 advertise-map Adv exist-map EXIST
>
> *If the first example does not turn you on, then, try this one:*
>
> same topology as before.
>
> *On R2*
>
> *track 1 list boolean and
> object 2
> object 3
> !
> track 2 ip route 1.0.0.0 255.0.0.0 reachability
> track 3 ip route 11.0.0.0 255.0.0.0 reachability*
>
> *Instead of creating a loopback interface and assigning 2.0.0.0/8 to it,
> just create a static route to Null0, as long as the static route is there,
> BGP will advertise it, since "Track 1" is referenced by the static route,
> this network (2.0.0.0/8) will only be there if the boolean logic is true:*
>
> * Router bgp 200
> Network 2.0.0.0
>
> *
> *ip route 2.0.0.0 255.0.0.0 Null0 track 1*
>
> * *
>
>
> On Sat, Aug 29, 2009 at 8:25 AM, S Malik <ccie.09_at_gmail.com> wrote:
>
>> Scott,
>> I already thought of using sla tracking, some how it does not seem to be
>> fitting in it.
>>
>> Only as-path is the option that I could match after a prefix list under
>> the
>> same clause and I think even this as-path should be the associated
>> attribute
>> of the prefix we matched earlier.
>>
>>
>> On Sat, Aug 29, 2009 at 10:39 AM, Scott Morris <smorris_at_ine.com> wrote:
>>
>> > No, they'd all be or, or, or, or....
>> >
>> > If you have the ability (likely not in CCIE) to use a static route, you
>> can
>> > put a track condition on it. With the tracking mechanisms, we have much
>> > more boolean control on and, or, not, etc. But not in a route-map!
>> Bummer
>> > there.
>> >
>> >
>> >
>> >
>> > *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......
>> >
>> >
>> > Divin Mathew John wrote:
>> >
>> > From wht Malik Qoouted..
>> > route-map ABC permit 10
>> > match ip add prefi P Q R
>> > match Ip add prefix XYZ
>> >
>> >
>> > means
>> >
>> > if((P OR Q OR R) AND (X OR Y OR Z)
>> > then exceute SET
>> >
>> > On Sat, Aug 29, 2009 at 7:26 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<http://www.cisco.com/en/US/docs/ios/12_4t/ip_route/configur
ation/guide/t_brbext.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<http://books.google.com/books?id=-SM1Jeu07UYC&pg=RA1-PA273&lpg=
RA1-PA273&dq=r%0Aoute-map+logical+AND&source=bl&ots=w8TcsNnJHf&sig=jvVGIhjeOB
FS6njdfBjFzn4cnyY%0A&hl=en&ei=fDGZSs_kAcuf8Qau8uSfBQ&sa=X&oi=book_result&ct=r
esult&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/><
>> >>> 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
>> >>> >>
>> >>> >>
>> >>>
>> _______________________________________________________________________
>> >>> >> Subscription information may be found
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>> >>> >>
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>> >>> >>
>> >>> >>
>> >>>
>> _______________________________________________________________________
>> >>> >> Subscription information may be found
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>> >>> >>
>> >>> >> Blogs and organic groups at http://www.ccie.net
>> >>> >>
>> >>> >>
>> >>>
>> _______________________________________________________________________
>> >>> >> Subscription information may be found at:
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>> >>>
>> >>>
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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."
>> >
>> >
>> >
>> >
>> > --
>> >
>> > Sent from Cochin, KL, India
>> > Rodney Dangerfield <http://www.quotationspage.com/quote/34016.html> -
>> "I
>> > went to a fight the other night, and a hockey game broke out."
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
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>>
>>
>>
>>
>>
>>
>
>
> --
> Narbik Kocharians
> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> www.MicronicsTraining.com
> Sr. Technical Instructor
>

--
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