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Allied Telesis X8100 Related How To Notes, Which products and software version does it apply to?

Models: X8100 x908

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	Introduction
BGP: Route Map Filtering Example	48
BGP configuration	48
Route map configuration	48
OSPF: Configuring Route Maps for Filtering and Modifying OSPF Routes	50
Configuring a match clause	50
Configuring a set clause	51
OSPF: Applying Route Maps	52

Related How To Notes

You can also configure route maps on routers and switches running AlliedWare. For details, see the AlliedWare Note How To Use Route Maps and Other Filters to Filter and Alter BGP and OSPF Routes. This Note is available from www.alliedtelesis.com/resources/literature/ howto.aspx.

Which products and software version does it apply to?

This configuration applies to AlliedWare Plus software version 5.2.2-0.4 and above, for the following Allied Telesis switches:

SwitchBlade x8100 (CFC400, CFC960)

SwitchBlade x908 and SBx908 Extended

x600 and x610 Series Switches

x900 Series switches

Note: This document is a revision of an AlliedWare document, and also applies to the following AlliedWare products and software versions.

AlliedWare Products: AR440S, AR441S, AR450S, AR725, AR745, AR750S, Rapier i series, AT-8800 series, AT-9800 series, AT-8948, AT-9924T, AT-9924SP, AT-9924T/4SP, AT-9924Ts, x900 series.

AlliedWare Software version: 2.7.4 and above.

Use Route Maps and Other Filters to Filter and Alter BGP and OSPF Routes Page 3

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Allied Telesis X8100, x908 manual Related How To Notes, Which products and software version does it apply to?

Contents

Technical Guide IntroductionBGP Applying Route Maps to Imported Routes ContentsIntroduction Which products and software version does it apply to?Which products and software version does it apply to? Related How To NotesBGP updates BGP Concepts and TerminologyBGP peers Next-hop Update attributesOrigin AS-pathDistribute filters Access Control List ACL filtersBGP Overview of the Available Filter Types Filter typesDifference and Relationship in BGP Examples for filtering BGP Update messages Example AS path filters on page  Example Prefix filters on page Hierarchy of the Different FiltersBGP Example  Example Distribute filters on pageBasic configuration awplus#show ip route Confirming the neighbor relationshipAlliedWare switch AlliedWare Plus switchAbout ACLs BGP Configuring Distribute FiltersUsing ACLs as filters Example Distribute filtersFilter out one particular route from a neighbor Filter out a range of prefix lengths 3. Check that the IP route table now includes all the routes awplusconfig# neighbor 45.45.45.46 distribute-list list2 inawplusconfig-router# do show ip route awplusconfig# router bgpUse a numbered ACL instead of a named ACL 4. Check that the IP route table no longer includes 52.0.0.0/8 awplusconfig-router# do show ip routeAS path lists BGP Configuring AS Path FiltersUsing AS path lists as path filters Example AS path filtersDiscard or allow routes from a neighbor 4. Shut down the neighbor, and then bring it up again a neighbor7. Shut down the neighbor, and then bring it up again An outgoing filter that uses an AS-path list Another exampleBGP Configuring AS Path Filters BGP Configuring Prefix Filters About prefix listsMask length awplusconfig-router# neighbor neighbor prefix-list list-name out Using prefix lists as prefix filtersExample Prefix filters awplusconfig-router# neighbor neighbor prefix-list list-name inFilter out a range of different prefix lengths awplusconfig-router# do show ip route BGP Configuring Prefix FiltersStructure of a route map BGP Configuring Route MapsConfiguring a match clause ClausesAn AS path list A community list CaseCase One or more prefixes, by using an ACL One or more prefixes, by using a prefix listA metric the MED attribute Configuring a set clauseA next hop address An originset community community-values additive set ip next-hop ipadd set weightset atomic-aggregate set extcommunity rtsoo ext-comm-numberA match clause and one or more set clauses The effect of different combinations of clausesOne match clause with an action No match clause and one or more set clausesRouter AS Update from PeerUpdate 1 to Peer Update 2 to PeerFirst, enter BGP router mode for the AS. The prompt should look like awplusconfig-route-map#set metric ExamplesExample B Match on a prefix-list that denies an entry awplusconfig#ip prefix-list test1 permit 52.0.0.0/84. Apply this route map as the in route map on the neighbor awplusconfig-route-map#router bgp Example D Matching on a next-hop prefix-listExample E Prepending AS numbers awplusconfig-route-map#match ip addressset bgp peer=45.45.45.45 outroutemap=com sendcommunity=yes 1. Configure the AW peer to send out a community numberThe routes coming from that peer has community add ip routem=com entry=1 set commmun=8989BGP#show ip route set bgp peer=45.45.45.45 outroutemap=mixed sendcommunity=yes 8. Add that ACL as a distribute-list in-filter on the neighbor route-map marker permit Examples Route maps ACLs Path filters Prefix filtersSyntax BGP Applying Route Maps to Imported Routesnetwork neighbor default-originateOther Uses of Route Maps neighbor unsuppress-mapBGP configuration Route map configurationBGP Route Map Filtering Example set local-preference route-map outdef permit Configuring a match clause OSPF Configuring Route Maps for Filtering and Modifying OSPF RoutesMetric InterfaceConfiguring a set clause A prefix, by using a prefix listA prefix, by using an ACL External route type Set the metric, by using the command set metric OSPF Applying Route Maps