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Allied Telesis X8100, x908 manual BGP Configuring AS Path Filters

Models: X8100 x908

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BGP: Configuring AS Path Filters

BGP table, the AS Path for the learnt routes is shown as "SEQ 34567". This entry is inserted into the AS-Path of the updates after they have passed through the filter.

BGP route table

Flags: >=Best route for the given prefix, *=Unreachable next hop, W=Withdrawn

m=Community, a=Aggregate route, s=Aggregate Suppressed, D=Damped Learned from: L=Local, e=eBGP Peer, i=iBGP Peer, c=Confederate

Peer

---------------------------------------------------------------------

Fl Prefix	Next hop	Origin	MED	Local pref
Path
Originator	Cluster List

---------------------------------------------------------------------

> 45.0.0.0/8	0.0.0.0	IGP	-	100
EMPTY
L -	-
> 45.45.45.0/24	45.45.45.45	INCOMPLETE	-	100
SEQ 34567;
e -	-
> 52.0.0.0/8	0.0.0.0	IGP	-	100
EMPTY
L -	-
> 64.0.0.0/4	45.45.45.45	INCOMPLETE	-	100
SEQ 34567;
e -	-

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Use Route Maps and Other Filters to Filter and Alter BGP and OSPF Routes Page 21

Image 21

Allied Telesis X8100, x908 manual BGP Configuring AS Path Filters

Contents

Technical Guide IntroductionIntroduction ContentsWhich products and software version does it apply to? BGP Applying Route Maps to Imported RoutesWhich products and software version does it apply to? Related How To NotesBGP updates BGP Concepts and TerminologyBGP peers Origin Update attributesAS-path Next-hopBGP Overview of the Available Filter Types Access Control List ACL filtersFilter types Distribute filtersDifference and Relationship in BGP Examples for filtering BGP Update messagesBGP Example Hierarchy of the Different Filters Example Distribute filters on page  Example AS path filters on page  Example Prefix filters on pageBasic configuration AlliedWare switch Confirming the neighbor relationshipAlliedWare Plus switch awplus#show ip routeAbout 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 awplusconfig-router# do show ip route awplusconfig# neighbor 45.45.45.46 distribute-list list2 inawplusconfig# router bgp 3. Check that the IP route table now includes all the routesUse 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 Example Prefix filters Using prefix lists as prefix filtersawplusconfig-router# neighbor neighbor prefix-list list-name in awplusconfig-router# neighbor neighbor prefix-list list-name outFilter 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 next hop address Configuring a set clauseAn origin A metric the MED attributeset community community-values additive set atomic-aggregate set weightset extcommunity rtsoo ext-comm-number set ip next-hop ipaddOne match clause with an action The effect of different combinations of clausesNo match clause and one or more set clauses A match clause and one or more set clausesUpdate 1 to Peer Update from PeerUpdate 2 to Peer Router ASFirst, enter BGP router mode for the AS. The prompt should look like Example B Match on a prefix-list that denies an entry Examplesawplusconfig#ip prefix-list test1 permit 52.0.0.0/8 awplusconfig-route-map#set metric4. Apply this route map as the in route map on the neighbor Example E Prepending AS numbers Example D Matching on a next-hop prefix-listawplusconfig-route-map#match ip address awplusconfig-route-map#router bgpThe routes coming from that peer has community 1. Configure the AW peer to send out a community numberadd ip routem=com entry=1 set commmun=8989 set bgp peer=45.45.45.45 outroutemap=com sendcommunity=yesBGP#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 RoutesOther Uses of Route Maps neighbor default-originateneighbor unsuppress-map networkBGP configuration Route map configurationBGP Route Map Filtering Example set local-preference route-map outdef permit Metric OSPF Configuring Route Maps for Filtering and Modifying OSPF RoutesInterface Configuring a match clauseA prefix, by using an ACL A prefix, by using a prefix listExternal route type Configuring a set clause Set the metric, by using the command set metric OSPF Applying Route Maps