Show Ip As-path-access-list

BGP Commandsshow ip bgpshow ip bgp (4-Byte Autonomous System Numbers): ExampleThe following sample output shows the BGP routing table with 4-byte autonomous system numbers,65536 and 65550, shown under the Path field. This example requires Cisco IOS Release 12.0(32)SY8,12.0(33)S3, 12.2(33)SRE, 12.2(33)XNE, 12.2(33)SXI1, Cisco IOS XE Release 2.4, or a later release.RouterB# show ip bgpBGP table version is 4, local router ID is 172.17.1.99Status codes: s suppressed, d damped, h history, * valid, best, i - internal,r RIB-failure, S StaleOrigin codes: i - IGP, e - EGP, ? - incompleteNetwork* 10.1.1.0/24* 10.2.2.0/24* 172.17.1.0/24Next Hop192.168.1.2192.168.3.20.0.0.0Metric LocPrf Weight Path00 6553600 65550032768 iiishow ip bgp ip-address: ExampleThe following sample output displays information about the 192.168.1.0 entry in the BGP routing table:Router# show ip bgp 192.168.1.0BGP routing table entry for 192.168.1.0/24, version 22Paths: (2 available, best #2, table default)Additional-pathAdvertised to update-groups:310 10192.168.3.2 from 172.16.1.2 (10.2.2.2)Origin IGP, metric 0, localpref 100, valid, internal, backup/repair10 10192.168.1.2 from 192.168.1.2 (10.3.3.3)Origin IGP, localpref 100, valid, external, best , recursive-via-connectedThe following sample output displays information about the 10.3.3.3 255.255.255.255 entry in the BGProuting table:Router# show ip bgp 10.3.3.3 255.255.255.255BGP routing table entry for 10.3.3.3/32, version 35Paths: (3 available, best #2, table default)Multipath: eBGPFlag: 0x860Advertised to update-groups:120010.71.8.165 from 10.71.8.165 (192.168.0.102)Origin incomplete, localpref 100, valid, external, backup/repairOnly allowed to recurse through connected route20010.71.11.165 from 10.71.11.165 (192.168.0.102)Origin incomplete, localpref 100, weight 100, valid, external, bestOnly allowed to recurse through connected route20010.71.10.165 from 10.71.10.165 (192.168.0.104)Origin incomplete, localpref 100, valid, external,Only allowed to recurse through connected routeTable 29 describes the significant fields shown in the display.Cisco IOS IP Routing: BGP Command ReferenceIRG-456March 2011

BGP Commandsshow ip bgpTable 29show ip bgp Field DescriptionsFieldDescriptionBGP routing table entry forIP address or network number of the routing table entry.versionInternal version number of the table. This number is incrementedwhenever the table changes.PathsThe number of available paths, and the number of installed bestpaths. This line displays “Default-IP-Routing-Table” when the bestpath is installed in the IP routing table.MultipathThis field is displayed when multipath loadsharing is enabled. Thisfield will indicate if the multipaths are iBGP or eBGP.Advertised to update-groupsThe number of each update group for which advertisements areprocessed.OriginOrigin of the entry. The origin can be IGP, EGP, or incomplete. Thisline displays the configured metric (0 if no metric is configured), thelocal preference value (100 is default), and the status and type ofroute (internal, external, multipath, best).Extended CommunityThis field is displayed if the route carries an extended communityattribute. The attribute code is displayed on this line. Informationabout the extended community is displayed on a subsequent line.show ip bgp all: ExampleThe following is sample output from the show ip bgp command entered with the all keyword.Information about all configured address families is displayed.Router# show ip bgp allFor address family: IPv4 Unicast*****BGP table version is 27, local router ID is 10.1.1.1Status codes: s suppressed, d damped, h history, * valid, best, i - internal,r RIB-failureOrigin codes: i - IGP, e - EGP, ? - incompleteNetwork* 10.1.1.0/24* 10.13.13.0/24* 10.15.15.0/24* i10.18.18.0/24* i10.100.0.0/16* i10.100.0.0/16* i10.101.0.0/16* i10.103.0.0/16* i10.104.0.0/16* i10.100.0.0/16* i10.101.0.0/16* 10.100.0.0/16* * 10.101.0.0/16* * 10.102.0.0/16* 172.16.14.0/24* 192.168.5.0* 10.80.0.0/16* 10.80.0.0/16Next 0.0.0.0172.16.14.108172.16.14.108Metric LocPrf Weight Path032768 ?032768 ?032768 ?1388 913510 100 e2622720 1 2 3 i1388 913510 100 e1388 913510 100 e1388173173 100 e1388173173 100 e2219 208890 53285 33299 51178 47751 e2219 208890 53285 33299 51178 47751 e23090 200 300 e13880 100 e23090 200 300 e13880 100 e13880 100 e032768 ?032768 ?13880 50 e13880 50 eCisco IOS IP Routing: BGP Command ReferenceMarch 2011IRG-457

BGP Commandsshow ip bgpFor address family: VPNv4 Unicast*****BGP table version is 21, local router ID is 10.1.1.1Status codes: s suppressed, d damped, h history, * valid, best, i - internal,r RIB-failureOrigin codes: i - IGP, e - EGP, ? - incompleteNetworkNext HopMetric LocPrf Weight PathRoute Distinguisher: 1:1 (default for vrf vpn1)* 10.1.1.0/24192.168.4.316220 100 53285 33299 51178{27016,57039,16690} e* 10.1.2.0/24192.168.4.316220 100 53285 33299 51178{27016,57039,16690} e* 10.1.3.0/24192.168.4.316220 100 53285 33299 51178{27016,57039,16690} e* 10.1.4.0/24192.168.4.316220 100 53285 33299 51178{27016,57039,16690} e* 10.1.5.0/24192.168.4.316220 100 53285 33299 51178{27016,57039,16690} e* i172.17.1.0/2410.3.3.310300 53285 33299 51178 47751* i172.17.2.0/2410.3.3.310300 53285 33299 51178 47751* i172.17.3.0/2410.3.3.310300 53285 33299 51178 47751* i172.17.4.0/2410.3.3.310300 53285 33299 51178 47751* i172.17.5.0/2410.3.3.310300 53285 33299 51178 47751?For address family: IPv4 Multicast*****BGP table version is 11, local router ID is 10.1.1.1Status codes: s suppressed, d damped, h history, * valid, best, i - internal,r RIB-failureOrigin codes: i - IGP, e - EGP, ? - incompleteNetwork* 10.40.40.0/26** 10.40.40.64/26** 10.40.40.128/26** 10.40.40.192/26* 10.40.41.0/26* i10.102.0.0/16* i10.103.0.0/16Next tric LocPrf Weight Path22190 21 22 {51178,47751,27016} e16220 15 20 1 {2} e22190 21 22 {51178,47751,27016} e16220 15 20 1 {2} e22190 21 22 {51178,47751,27016} e25630 15 20 1 {2} e25630 15 20 1 {2} e12090 15 20 1 {2} e3005000 5 4 {101,102} e3005000 5 4 {101,102} eFor address family: NSAP Unicast *****BGP table version is 1, local router ID is 10.1.1.1Status codes: s suppressed, d damped, h history, * valid, best, i - internal,r RIB-failureOrigin codes: i - IGP, e - EGP, ? - incompleteNetworkNext HopMetric LocPrf Weight Path* 00 ?* 1000 ?* 00 ?* sco IOS IP Routing: BGP Command ReferenceIRG-458March 2011

BGP Commandsshow ip bgpshow ip bgp longer-prefixes: ExampleThe following is sample output from the show ip bgp command entered with the longer-prefixeskeyword:Router# show ip bgp 10.92.0.0 255.255.0.0 longer-prefixesBGP table version is 1738, local router ID is 192.168.72.24Status codes: s suppressed, * valid, best, i - internalOrigin codes: i - IGP, e - EGP, ? - incomplete* ** ** ** ** ** ** ** ** 2.15.010.92.16.010.92.17.010.92.18.010.92.19.0Next 0Metric LocPrf Weight Path889632768 ?0 109 108879632768 ?0 109 1084248232768 ?0 109 108879632768 ?0 109 108869632768 ?0 109 108140032768 ?0 109 108140032768 ?0 109 108887632768 ?0 109 108887632768 ?0 109 108?show ip bgp shorter-prefixes: ExampleThe following is sample output from the show ip bgp command entered with the shorter-prefixeskeyword. An 8-bit prefix length is specified.Router# show ip bgp 172.16.0.0/16 shorter-prefixes 8* 172.16.0.0*10.0.0.210.0.0.200 ?0 200 ?show ip bgp prefix-list: ExampleThe following is sample output from the show ip bgp command entered with the prefix-list keyword:Router# show ip bgp prefix-list ROUTEBGP table version is 39, local router ID is 10.0.0.1Status codes:s suppressed, d damped, h history, * valid, best, i internalOrigin codes:i - IGP, e - EGP, ? - incompleteNetwork* 192.168.1.0*Next Hop10.0.0.210.0.0.2Metric LocPrf Weight Path0 ?00 200 ?Cisco IOS IP Routing: BGP Command ReferenceMarch 2011IRG-459

BGP Commandsshow ip bgpshow ip bgp route-map: ExampleThe following is sample output from the show ip bgp command entered with the route-map keyword:Router# show ip bgp route-map LEARNED PATHBGP table version is 40, local router ID is 10.0.0.1Status codes:s suppressed, d damped, h history, * valid, best, i internalOrigin codes:i - IGP, e - EGP, ? - incompleteNetwork* 192.168.1.0*Related CommandsNext Hop10.0.0.210.0.0.2Metric LocPrf Weight Path0 ?00 200 ?CommandDescriptionbgp asnotation dotChanges the default display and the regular expression match format ofBGP 4-byte autonomous system numbers from asplain (decimal values) todot notation.ip prefix-listCreates a prefix list or adds a prefix-list entry.route-mapDefines the conditions for redistributing routes from one routing protocolinto another routing protocol.router bgpConfigures the BGP routing process.Cisco IOS IP Routing: BGP Command ReferenceIRG-460March 2011

BGP Commandsshow ip bgp all dampeningshow ip bgp all dampeningTo display BGP dampening information, use the show ip bgp all dampening command in user EXECor privileged EXEC mode.show ip bgp all dampening {dampened-paths flap-statistics [filter-list filter-list quote-regexp regexp regexp regexp] parameters}Syntax Descriptiondampened-pathsDisplay routes suppressed due to dampening.flap-statisticsDisplays flap statistics of routes.filter-list filter-list(Optional) Used with the flap-statistics keyword, displays routes thatconform to the specified filter list in the range 1-500.quote-regexp regexp(Optional) Used with the flap-statistics keyword, displays routes matchingthe AS path “regular expression”.regexp regexp(Optional) Used with the flap-statistics keyword, displays routes matchingthe AS path regular expression.parametersDisplay details of configured dampening parameters.Command ModesUser EXEC ( )Privileged EXECCommand HistoryReleaseModification15.0(1)MThis command was introduced.Usage GuidelinesUse this command to display BGP dampening information.ExamplesThe following example show how to display the BGP dampening parameters.Router# show ip bgp all dampening parametersFor address family: IPv4 Unicast% dampening not enabled for baseFor address family: VPNv4 Unicast% dampening not enabled for baseFor vrf: Cust Adampening 15 750 2000 60 (DEFAULT)Half-life time: 15 minsMax suppress penalty: 12000Suppress penalty: 2000Decay Time: 2320 secsMax suppress time: 60 minsReuse penalty: 750For vrf: Cust Bdampening 15 750 2000 60 (DEFAULT)Cisco IOS IP Routing: BGP Command ReferenceMarch 2011IRG-461

BGP Commandsshow ip bgp all dampeningHalf-life time: 15 minsMax suppress penalty: 12000Suppress penalty: 2000Decay Time: 2320 secsMax suppress time: 60 minsReuse penalty: 750For address family: IPv4 Multicast% dampening not enabled for baseRouter#Table 30 describes the significant fields shown in the display.Table 30show ip bgp all dampening Field DescriptionsFieldDescriptionHalf-life timeTime after which a penalty is decreased, in minutes. Once the interface hasbeen assigned a penalty, the penalty is decreased by half after the half-lifeperiod. The process of reducing the penalty happens every 5 seconds. Therange of the half-life is 1 to 45 minutes. The default is 1 minute.Decay TimePenalty value below which an unstable interface is unsuppressed, inseconds. The process of unsuppressing routers occurs at 10-secondincrements. The range of the reuse value is 1 to 20000 seconds. The defaultvalue is 750 seconds.Max suppress penaltyLimit at which an interface is suppressed when its penalty exceeds that limit,in seconds. The default value is 2000 seconds.Max suppress timeMaximum time that an interface can be suppressed, in minutes. This valueeffectively acts as a ceiling that the penalty value cannot exceed. The defaultvalue is four times the half-life period.The following is sample output for the show ip bgp all dampening dampened-paths command. Theoutput includes dampened paths for individual VRFs.Router# show ip bgp all dampening dampened-pathsFor address family: IPv4 Unicast% dampening not enabled for baseFor address family: VPNv4 Unicast% dampening not enabled for baseFor vrf: Cust ABGP table version is 42, local router ID is 144.124.23.2Status codes: s suppressed, d damped, h history, * valid, best, i - internal,r RIB-failure, S Stale, m multipath, b backup-path, x best-externalOrigin codes: i - IGP, e - EGP, ? - incompleteNetworkFromRoute Distinguisher: 1:100 (Cust A)*d 10.10.10.10/32172.16.1.2*d 20.20.20.20/32172.16.1.2ReusePath00:04:49 65001 ?00:04:59 65001 ?For address family: IPv4 Multicast% dampening not enabled for baseCisco IOS IP Routing: BGP Command ReferenceIRG-462March 2011

BGP Commandsshow ip bgp all dampeningRelated CommandsCommandDescriptionbgp dampeningEnables BGP route dampening or changes various BGP routedampening factors.show dampening interfaceDisplays a summary of the dampening parameters and status.Cisco IOS IP Routing: BGP Command ReferenceMarch 2011IRG-463

BGP Commandsshow ip bgp cidr-onlyshow ip bgp cidr-onlyTo display routes with classless interdomain routing (CIDR), use the show ip bgp cidr-only commandin EXEC mode.show ip bgp cidr-onlySyntax DescriptionThis command has no arguments or keywords.Command ModesEXECCommand HistoryReleaseModification10.0This command was introduced.12.2(31)SBThis command was integrated into Cisco IOS Release 12.2(31)SB.Examples12.2(33)SRAThis command was integrated into Cisco IOS Release 12.2(33)SRA.12.2SXThis command is supported in the Cisco IOS Release 12.2SX train. Support in aspecific 12.2SX release of this train depends on your feature set, platform, andplatform hardware.The following is sample output from the show ip bgp cidr-only command in privileged EXEC mode:Router# show ip bgp cidr-onlyBGP table version is 220, local router ID is 172.16.73.131Status codes: s suppressed, * valid, best, i - internalOrigin codes: i - IGP, e - EGP, ? - incompleteNetwork* 192.168.0.0/8* 172.16.0.0/16Next Hop172.16.72.24172.16.72.30Metric LocPrf Weight Path0 1878 ?0 108 ?Table 31 describes the significant fields shown in the display.Table 31show ip bgp cidr-only Field DescriptionsFieldDescriptionBGP table version is 220Internal version number of the table. This number is incrementedwhenever the table changes.local router IDIP address of the router.Status codesStatus of the table entry. The status is displayed at the beginning ofeach line in the table. It can be one of the following values:s—The table entry is suppressed.*—The table entry is valid. —The table entry is the best entry to use for that network.i—The table entry was learned via an internal BGP (iBGP) session.Cisco IOS IP Routing: BGP Command ReferenceIRG-464March 2011

BGP Commandsshow ip bgp cidr-onlyTable 31show ip bgp cidr-only Field Descriptions (continued)FieldDescriptionOrigin codesOrigin of the entry. The origin code is placed at the end of each linein the table. It can be one of the following values:i—Entry originated from an Interior Gateway Protocol (IGP) and wasadvertised with a network router configuration command.e—Entry originated from an Exterior Gateway Protocol (EGP).?—Origin of the path is not clear. Usually, this is a router that isredistributed into BGP from an IGP.NetworkInternet address of the network the entry describes.Next HopIP address of the next system that is used when forwarding a packetto the destination network. An entry of 0.0.0.0 indicates that theaccess server has some non-BGP route to this network.MetricIf shown, the value of the interautonomous system metric.LocPrfLocal preference value as set with the set local-preferenceroute-map configuration command. The default value is 100.WeightWeight of the route as set via autonomous system filters.PathAutonomous system paths to the destination network. There can beone entry in this field for each autonomous system in the path. At theend of the path is the origin code for the path:i—The entry was originated with the IGP and advertised with anetwork router configuration command.e—The route originated with EGP.?—The origin of the path is not clear. Usually this is a path that isredistributed into BGP from an IGP.Cisco IOS IP Routing: BGP Command ReferenceMarch 2011IRG-465

BGP Commandsshow ip bgp communityshow ip bgp communityTo display routes that belong to specified BGP communities, use the show ip bgp community commandin EXEC mode.show ip bgp community community-number [exact]Syntax Descriptioncommunity-numberValid value is a community number in the range from 1 to 4294967200, orAA:NN (autonomous system-community number/2-byte number), internet,no-export, local-as, or no-advertise.exact(Optional) Displays only routes that have the same specified communities.Command ModesEXECCommand HistoryReleaseModification10.3This command was introduced.12.0The local-as community was added.12.2(33)SRAThis command was integrated into Cisco IOS Release 12.2(33)SRA.12.2SXThis command is supported in the Cisco IOS Release 12.2SX train. Supportin a specific 12.2SX release of this train depends on your feature set,platform, and platform hardware.ExamplesThe following is sample output from the show ip bgp community command in privileged EXEC mode:Router# show ip bgp community 111:12345 local-asBGP table version is 10, local router ID is 224.0.0.10Status codes: s suppressed, d damped, h history, * valid, best, i - internalOrigin codes: i - IGP, e - EGP, ? - incomplete* * * * ** * * 1.0Next 43.222.210.43.222.210.43.222.210.43.222.2Metric LocPrf Weight Path00 222 ?00 222 ?00 222 ?00 222 ?00 222 i00 222 ?00 222 i00 222 ?Cisco IOS IP Routing: BGP Command ReferenceIRG-466March 2011

BGP Commandsshow ip bgp communityTable 32 describes the significant fields shown in the display.Table 32show ip bgp community Field DescriptionsFieldDescriptionBGP table versionInternal version number of

Examples The following is sample output from the show ip as-path-access-list command: Router# show ip as-path-access-list AS path access list 34 deny RTR AS path access list 100 permit 100 Table 27 describes the fields shown in the display. number (Optional) Specifies the AS path access list number. The range is from 1 to 500.