Re: Conditional Advertise

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
> >>
> >> 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/><
> >>> 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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> >>> >>
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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."
>
>
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-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
Sr. Technical Instructor
Blogs and organic groups at http://www.ccie.net