RE: Conditional Advertise

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From: Ryan West <rwest_at_zyedge.com>
Date: Sat, 29 Aug 2009 11:07:54 -0400

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This archive was : Tue Sep 01 2009 - 05:43:57 ART recently on another board, you'll be happy or not so happy to find out that others are having the same issue. l-archive.com/cisco-nsp@puck.nether.net/msg22269.html">http://www.mail-archive.com/cisco-nsp@puck.nether.net/msg22269.html a way to get the AND statement working, I was thinking about reverse logic for a little bit, but that struggles from the same problem of a single match and processing. I would imagine this is (or should be) in for a feature request or bug fix. learned something though :) .com [mailto:nobody_at_groupstudy.com] On Behalf Of Scott Morris 29, 2009 10:39 AM Subramanian Natarajan; Sagar Rane; ccielab_at_groupstudy.com ability (likely not in CCIE) to use a static route, you With the tracking mechanisms, we have control on and, or, not, etc. But not in a CCIE/x4/ (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIS-ER, CISSP, et al. ernetworkExpert.com">http://www.InternetworkExpert.com From wht Malik Qoouted.. route-map ABC permit 10 match ip add prefi P Q R match Ip add prefix XYZ 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 <mailto: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 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_brbext.html#wp1061585 On Sat, Aug 29, 2009 at 7:20 PM, S Malik <ccie.09_at_gmail.com <mailto: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=-SM1Jeu07UYC&pg=RA1-PA273&lpg=RA1-PA273&dq=r%0Aoute-map+logical+AND&source=bl&ots=w8TcsNnJHf&sig=jvVGIhjeOBFS6njdfBjFzn4cnyY%0A&hl=en&ei=fDGZSs_kAcuf8Qau8uSfBQ&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 <mailto: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 <mailto: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 <mailto:evil_at_ine.com> >> >> >> Internetwork Expert, Inc. >> >> 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 <mailto: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 <mailto:sagar.ccie_at_gmail.com>> <sagar.ccie_at_gmail.com <mailto: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 <http://10.1.1.0/24> and 20.2.2.2/32 <http://20.2.2.2/32>) and only if both routes are >> present, >> it should originate a route advertisement of 192.168.10.0/24 <http://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 at:http://www.groupstudy.com/list/CCIELab.html >> >> Blogs and organic groups at http://www.ccie.net >> >> _______________________________________________________________________ >> Subscription information may be found at:http://www.groupstudy.com/list/CCIELab.html >> >> Blogs and organic groups at http://www.ccie.net >> >> _______________________________________________________________________ >> Subscription information may be found at: http://www.groupstudy.com/list/CCIELab.html Blogs and organic groups at http://www.ccie.net _______________________________________________________________________ Subscription information may be found at: http://www.groupstudy.com/list/CCIELab.html 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." groups at http://www.ccie.net on Sat Aug 29 2009 - 11:07:54 ART name="navbarfoot" title="Related messages"> [ Message body ] Mohamed El Henawy: "Re: Auto RP with sparse-mode and no dm-fallback..and its" message: Ryan West: "RE: How to use Kron Schedule to reload a router" reply to: Sagar Rane: "Conditional Advertise" thread: S Malik: "Re: Conditional Advertise" id="options2">Contemporary messages sorted: [ by date ] [ by thread ] [ by subject ] [ by author ] [ by messages with attachments ] generated by hypermail 2.2.0