|
|
This chapter explains the function and syntax of the Border Gateway Protocol (BGP) commands. For more information about defaults and usage guidelines, see the corresponding chapter of the Cisco IOS IP and IP Routing Command Reference, Release 12.1.
To create an aggregate entry in a BGP routing table, use the aggregate-address router configuration command. To disable this function, use the no form of this command.
aggregate-address address mask [as-set] [summary-only] [suppress-map map-name][advertise-map map-name] [attribute-map map-name]
Syntax Description
address Aggregate address. mask Aggregate mask. as-set (Optional) Generates autonomous system set path information. summary-only (Optional) Filters all more specific routes from updates. suppress-map map-name (Optional) Name of route map used to select the routes to be suppressed. advertise-map map-name (Optional) Name of route map used to select the routes to create AS-SET origin communities. attribute-map map-name (Optional) Name of route map used to set the attribute of the aggregate route.
To restore the default behavior of automatic summarization of subnet routes into network-level routes, use the auto-summary router configuration command. To disable this feature and send subprefix routing information across classful network boundaries, use the no form of this command.
auto-summarySyntax Description
This command has no arguments or keywords.
To allow the comparison of the Multi Exit Discriminator (MED) for paths from neighbors in different autonomous systems, use the bgp always-compare-med router configuration command. To disallow the comparison, use the no form of this command.
bgp always-compare-medSyntax Description
This command has no arguments or keywords.
To prevent the router from considering as-path as a factor in the algorithm for choosing a route, use the bgp bestpath as-path ignore router configuration command. To allow the router to consider as-path in choosing a route, use the no form of this command.
bgp bestpath as-path ignoreSyntax Description
This command has no arguments or keywords.
To enable MED comparison among paths learned from confederation peers, use the bgp bestpath med-confed router configuration command. To prevent the software from considering the MED attribute in comparing paths, use the no form of this command.
bgp bestpath med-confedSyntax Description
This command has no arguments or keywords.
To have Cisco IOS software consider a missing MED attribute in a path as having a value of infinity, making the path without a MED value the least desirable path, use the bgp bestpath missing-as-worst router configuration command. To return the router to the default (assign a value of 0 to the missing MED), use the no form of this command.
bgp bestpath missing-as-worstSyntax Description
This command has no arguments or keywords.
To restore route reflection from a Border Gateway Protocol (BGP) route reflector to clients, use the bgp client-to-client reflection router configuration command. To disable client-to-client reflection, use the no form of this command.
bgp client-to-client reflectionSyntax Description
This command has no arguments or keywords.
To configure the cluster ID if the Border Gateway Protocol (BGP) cluster has more than one route reflector, use the bgp cluster-id router configuration command. To remove the cluster ID, use the no form of this command.
bgp cluster-id cluster-id
Syntax Description
cluster-id Cluster ID of this router acting as a route reflector; maximum of 4 bytes.
To specify a Border Gateway Protocol (BGP) confederation identifier, use the bgp confederation identifier router configuration command. To remove the confederation identifier, use the no form of this command.
bgp confederation identifier autonomous-system
Syntax Description
autonomous-system Autonomous system number that internally includes multiple autonomous systems.
To configure the autonomous systems that belong to the confederation, use the bgp confederation peers router configuration command. To remove an autonomous system from the confederation, use the no form of this command.
bgp confederation peers autonomous-system [autonomous-system]
Syntax Description
autonomous-system Autonomous system numbers for BGP peers that will belong to the confederation.
No confederation peers are configured.
To enable Border Gateway Protocol (BGP) route dampening or change various BGP route dampening factors, use the bgp dampening global configuration command. To disable the function or restore the default values, use the no form of this command.
bgp dampening [half-life reuse suppress max-suppress-time] [route-map map]
Syntax Description
half-life (Optional) Time (in minutes) after which a penalty is decreased. Once the route has been assigned a penalty, the penalty is decreased by half after the half-life period (which is 15 minutes by default). The process of reducing the penalty happens every 5 seconds. The range of the half-life period is 1 to 45 minutes. The default is 15 minutes. reuse (Optional) If the penalty for a flapping route decreases enough to fall below this value, the route is unsuppressed. The process of unsuppressing routes occurs at 10-second increments. The range of the reuse value is 1 to 20000; the default is 750. suppress (Optional) A route is suppressed when its penalty exceeds this limit. The range is 1 to 20000; the default is 2000. max-suppress-time (Optional) Maximum time (in minutes) a route can be suppressed. The range is 1 to 20000; the default is 4 times the half-life. If the half-life value is allowed to default, the maximum suppress time defaults to 60 minutes. route-map map (Optional) Name of route map that controls where BGP route dampening is enabled.
To change the default local preference value, use the bgp default local-preference router configuration command. To return to the default setting, use the no form of this command.
bgp default local-preference value
Syntax Description
value Local preference value from 0 to 4294967295. Higher is more preferred.
To have Cisco IOS software compare the MED variable when choosing among routes advertised by different peers in the same autonomous system, use the bgp deterministic med router configuration command. To disallow the comparison, use the no form of this command.
bgp deterministic medSyntax Description
This command has no arguments or keywords.
To immediately reset the Border Gateway Protocol (BGP) sessions of any directly adjacent external peers if the link used to reach them goes down, use the bgp fast-external-fallover router configuration command. To disable this function, use the no form of this command.
bgp fast-external-falloverSyntax Description
This command has no arguments or keywords.
To enable logging of Border Gateway Protocol (BGP) neighbor resets, use the bgp log-neighbor-changes router configuration command. To disable the logging of changes in BGP neighbor adjacencies, use the no form of this command.
bgp log-neighbor-changesSyntax Description
This command has no arguments or keywords.
To reset a BGP connection using Border Gateway Protocol (BGP) soft reconfiguration, use the clear ip bgp EXEC command at the system prompt.
clear ip bgp {* | address | peer-group-name} [soft [in | out]]
Syntax Description
* Resets all current BGP sessions. address Resets only the identified BGP neighbor. peer-group-name Resets the specified BGP peer group. soft (Optional) Soft reset. Does not reset the session. in | out (Optional) Triggers inbound or outbound soft reconfiguration. If the in or out option is not specified, both inbound and outbound soft reset are triggered.
Syntax Description
address (Optional) IP address of the network about which to clear dampening information. mask (Optional) Network mask applied to the address.
To clear Border Gateway Protocol (BGP) flap statistics, use the clear ip bgp flap-statistics EXEC command.
clear ip bgp address flap-statistics [{regexp regexp} | {filter-list list} | {address mask}]
Syntax Description
regexp regexp (Optional) Clears flap statistics for all the paths that match the regular expression. filter-list list (Optional) Clears flap statistics for all the paths that pass the access list. address (Optional) Clears flap statistics for a single entry at this IP address. If this argument is placed before flap-statistics, the router clears flap statistics for all paths from the neighbor at this address. mask (Optional) Network mask applied to the address.
To clear all the members of a Border Gateway Protocol (BGP) peer group, use the clear ip bgp peer-group EXEC command.
clear ip bgp peer-group tag
Syntax Description
tag Name of the BGP peer group to clear.
To reset the hit count of the prefix list entries, use the clear ip prefix-list router configuration command.
clear ip bgp prefix-list [name] [network/len]
Syntax Description
name (Optional) The name of the prefix list from which the hit count is to be cleared. network/len (Optional) The network number and length (in bits) of the network mask.
To originate network 0.0.0.0 into the Border Gateway Protocol (BGP), use the default-information originate router configuration command. To disable this function, use the no form of this command.
default-information originateSyntax Description
This command has no arguments or keywords.
To set default metric values for the Border Gateway Protocol BGP routing protocol, use the default-metric router configuration command. To return to the default state, use the no form of this command.
default-metric number
Syntax Description
number Default metric value appropriate for the specified routing protocol.
To allow the use of external, internal, and local administrative distances that could be a better route to a node, use the distance bgp router configuration command. To return to the default values, use the no form of this command.
distance bgp external-distance internal-distance local-distance
Syntax Description
external-distance Administrative distance for Border Gateway Protocol (BGP) external routes. External routes are routes for which the best path is learned from a neighbor external to the autonomous system. Acceptable values are from 1 to 255. The default is 20. Routes with a distance of 255 are not installed in the routing table. internal-distance Administrative distance for BGP internal routes. Internal routes are those routes that are learned from another BGP entity within the same autonomous system. Acceptable values are from 1 to 255. The default is 200. Routes with a distance of 255 are not installed in the routing table. local-distance Administrative distance for BGP local routes. Local routes are those networks listed with a network router configuration command, often as back doors, for that router or for networks that are being redistributed from another process. Acceptable values are from 1 to 255. The default is 200. Routes with a distance of 255 are not installed in the routing table.
To filter networks received in updates, use the distribute-list in router configuration command. To disable this function, use the no form of this command.
distribute-list {access-list-number | prefix-list} in [type number]
Syntax Description
access-list-number | name Standard IP access list number or name. The list defines which networks are to be received and which are to be suppressed in routing updates. prefix-list Name of a prefix list. The list defines which networks are to be received and which are to be suppressed in routing updates, based upon matching the network prefix to the prefixes in the list. in Applies the access list to incoming routing updates. type (Optional) Interface type. number (Optional) Interface number on which the access list should be applied to incoming updates. If no interface is specified, the access list will be applied to all incoming updates.
To suppress networks from being advertised in updates, use the distribute-list out router configuration command. To disable this function, use the no form of this command.
distribute-list {access-list-number | name | prefix-list prefix-listname} out [interface-name | routing-process | autonomous-system-number]
Syntax Description
access-list-number | name Standard IP access list number or name. The list defines which networks are to be received and which are to be suppressed in routing updates. prefix-list Name of a prefix list. The list defines which networks are to be received and which are to be suppressed in routing updates, based upon matching the network prefix to the prefixes in the list. out Applies the access list to outgoing routing updates. interface-name (Optional) Name of a particular interface. routing-process (Optional) Name of a particular routing process, or the keyword static or connected. autonomous-system- (Optional) Autonomous system number.
number
To define a Border Gateway Protocol (BGP) AS path access list, use the ip as-path access-list global configuration command. To disable use of the access list, use the no form of this command.
ip as-path access-list access-list-number {permit | deny} as-regular-expression
Syntax Description
access-list-number Integer from 1 to 199 that indicates the regular expression access list number. permit Permits access for matching conditions. deny Denies access to matching conditions. as-regular-expression Autonomous system in the access list using a regular expression. See the appendix "Regular Expressions" in the Cisco IOS Dial Services Command Reference for information about forming regular expressions.
To display BGP communities in the format AA:NN (autonomous system-community number/2-byte number), use the ip bgp-community new-format global configuration command. To reenable the previous display format for BGP communities (one 32-bit number), use the no form of this command.
ip bgp-community new-formatSyntax Description
This command has no argument or keywords.
To create a community list for Border Gateway Protocol (BGP) and control access to it, use the ip community-list global configuration command. To delete the community list, use the no form of this command.
ip community-list community-list-number {permit | deny} community-number
Syntax Description
community-list-number Integer from 1 to 99 that identifies one or more permit or deny groups of communities. permit Permits access for a matching condition. deny Denies access for a matching condition. community-number Community number configured by a set community command. Valid value is one of the following:
To create an entry in a prefix list, use the ip prefix-list global configuration command. To delete the entry, use the no form of this command.
ip prefix-list list-name [seq seq-value] deny | permit network/len [ge ge-value] [le le-value]
Syntax Description
list-name Name of a prefix list. seq (Optional) Applies the sequence number to the prefix list entry being created or deleted. seq-value (Optional) Specifies the sequence number for the prefix list entry. deny Denies access to matching conditions. permit Permits access for matching conditions. network/len (Mandatory) The network number and length (in bits) of the network mask. ge (Optional) Applies the ge-value to the range specified. ge-value (Optional) Specifies the lesser value of a range (the "from" portion of the range description). le (Optional) Applies the le-value to the range specified. le-value (Optional) Specifies the greater value of a range (the "to" portion of the range description).
To add a text description of a prefix list, use the ip prefix-list description global configuration command. To remove the text description, use the no form of this command.
ip prefix-list list-name description text
Syntax Description
list name Prefix list name. text Text description of te prefix list.
To enable the generation of sequence numbers for entries in a prefix list, use the ip prefix-list sequence-number global configuration command. To remove the text description, use the no form of this command.
ip prefix-list sequence-numberSyntax Description
This command has no arguments or keywords.
Syntax Description
path-list-number Autonomous system path access list. An integer from 1 to 199.
To match a Border Gateway Protocol (BGP) community, use the match community-list route-map configuration command. To remove the community list entry, use the no form of this command.
match community-list community-list-number [exact]
Syntax Description
community-list-number Community list number in the range 1 to 99. exact (Optional) Indicates an exact match is required. All of the communities and only those communities in the community list must be present.
To set the minimum interval between the sending of Border Gateway Protocol (BGP) routing updates, use the neighbor advertisement-interval router configuration command. To remove an entry, use the no form of this command.
neighbor {ip-address | peer-group-name} advertisement-interval seconds
Syntax Description
ip-address Neighbor's IP address. peer-group-name Name of a BGP peer group. seconds Time in seconds. Integer from 0 to 600.
To allow a Border Gateway Protocol (BGP) speaker (the local router) to send the default route 0.0.0.0 to a neighbor for use as a default route, use the neighbor default-originate router configuration command. To send no route as a default, use the no form of this command.
neighbor {ip-address | peer-group-name} default-originate [route-map map-name]
Syntax Description
ip-address Neighbor's IP address. peer-group-name Name of a BGP peer group. route-map map-name (Optional) Name of the route map. The route map allows route 0.0.0.0 to be injected conditionally.
To associate a description with a neighbor, use the neighbor description router configuration command. To remove the description, use the no form of this command.
neighbor {ip-address | peer-group-name} description text
Syntax Description
ip-address Neighbor's IP address. peer-group-name Name of a BGP peer group. text Text (up to 80 characters) that describes the neighbor.
To distribute Border Gateway Protocol (BGP) neighbor information as specified in an access list, use the neighbor distribute-list router configuration command. To remove an entry, use the no form of this command.
neighbor {ip-address | peer-group-name} distribute-list {access-list-number | name/ prefix-list-name} {in | out}
Syntax Description
ip-address Neighbor's IP address. peer-group-name Name of a BGP peer group. access-list-number | name Number or name of a standard or extended access list. It can be an integer from 1 to 199. prefix-list-name Name of a BGP prefix list. in Access list is applied to incoming advertisements to that neighbor. out Access list is applied to outgoing advertisements from that neighbor.
To accept and attempt Border Gateway Protocol (BGP) connections to external peers residing on networks that are not directly connected, use the neighbor ebgp-multihop router configuration command. To return to the default, use the no form of this command.
neighbor {ip-address | peer-group-name} ebgp-multihop [ttl]
Syntax Description
ip-address IP address of the BGP-speaking neighbor. peer-group-name Name of a BGP peer group. ttl (Optional) Time-to-live in the range 1 to 255 hops.
To set up a Border Gateway Protocol (BGP) filter, use the neighbor filter-list router configuration command. To disable this function, use the no form of this command.
neighbor {ip-address | peer-group-name} filter-list access-list-number {in | out}
Syntax Description
ip-address IP address of the neighbor. peer-group-name Name of a BGP peer group. access-list-number Number of an autonomous system path access list. You define this access list with the ip as-path access-list command. in Access list to incoming routes. out Access list to outgoing routes.
To control how many prefixes can be received from a neighbor, use the neighbor maximum-prefix router configuration command. To disable this function, use the no form of this command.
neighbor {ip-address | peer-group-name} maximum-prefix maximum [threshold] [warning-only]
Syntax Description
ip-address IP address of the neighbor. peer-group-name Name of a BGP peer group. maximum Maximum number of prefixes allowed from this neighbor. threshold (Optional) Integer specifying at what percentage of maximum the router starts to generate a warning message. The range is from 1 to 100; the default is 75 (percent). warning-only (Optional) Allows the router to generate log message when the maximum is exceeded, instead of terminating the peering.
To configure the router as the next hop for a BGP-speaking neighbor or peer group, use the neighbor next-hop-self router configuration command. To disable this feature, use the no form of this command.
neighbor {ip-address | peer-group-name} next-hop-self
Syntax Description
ip-address IP address of the BGP-speaking neighbor. peer-group-name Name of a BGP peer group.
To enable Message Digest 5 (MD5) authentication on a TCP connection between two Border Gateway Protocol (BGP) peers, use the neighbor password router configuration command. To disable this function, use the no form of this command.
neighbor {ip-address | peer-group-name} password string
Syntax Description
ip-address IP address of the BGP-speaking neighbor. peer-group-name Name of a BGP peer group. string Case-sensitive password of up to 80 characters. The first character cannot be a number. The string can contain any alphanumeric characters, including spaces. You cannot specify a password in the format number-space-anything. The space after the number causes problems.
To configure a Border Gateway Protocol (BGP) neighbor to be a member of a peer group, use the neighbor peer-group router configuration command. To remove the neighbor from the peer group, use the no form of this command.
neighbor ip-address peer-group peer-group-name
Syntax Description
ip-address IP address of the BGP neighbor who belongs to the peer group specified by the tag. peer-group-name Name of the BGP peer group to which this neighbor belongs.
To create a Border Gateway Protocol (BGP) peer group, use the neighbor peer-group router configuration command. To remove the peer group and all of its members, use the no form of this command.
neighbor peer-group-name peer-group
Syntax Description
peer-group-name Name of the BGP peer group.
To distribute Border Gateway Protocol (BGP) neighbor information as specified in a prefix list, use the neighbor prefix-list router configuration command. To remove an entry, use the no form of this command.
neighbor {ip-address | peer-group-name} prefix-list prefix-listname {in | out}
Syntax Description
ip-address Neighbor's IP address. peer-group-name Name of a BGP peer group. prefix-listname Name of a prefix list. in Access list is applied to incoming advertisements to that neighbor. out Access list is applied to outgoing advertisements from that neighbor.
To add an entry to the Border Gateway Protocol (BGP) neighbor table, use the neighbor remote-as router configuration command. To remove an entry from the table, use the no form of this command.
neighbor {ip-address | peer-group-name} remote-as number
Syntax Description
ip-address Neighbor's IP address. peer-group-name Name of a BGP peer group. number Autonomous system to which the neighbor belongs.
To apply a route map to incoming or outgoing routes, use the neighbor route-map router configuration command. To remove a route map, use the no form of this command.
neighbor {ip-address | peer-group-name} route-map map-name {in | out}
Syntax Description
ip-address Neighbor's IP address. peer-group-name Name of a BGP peer group. map-name Name of route map. in Apply to incoming routes. out Apply to outgoing routes.
To configure the router as a Border Gateway Protocol (BGP) route reflector and configure the specified neighbor as its client, use the neighbor route-reflector-client router configuration command. To indicate that the neighbor is not a client, use the no form of this command. When all the clients are disabled, the local router is no longer a route reflector.
neighbor ip-address route-reflector-client
Syntax Description
ip-address IP address of the BGP neighbor being identified as a client.
To specify that a "communities" attribute should be sent to a Border Gateway Protocol (BGP) neighbor, use the neighbor send-community router configuration command. To remove the entry, use the no form of this command.
neighbor {ip-address | peer-group-name} send-community
Syntax Description
ip-address Neighbor's IP address. peer-group-name Name of a BGP peer group.
To disable a neighbor or peer group, use the neighbor shutdown router configuration command. To reenable the neighbor or peer group, use the no form of this command.
neighbor {ip-address | peer-group-name} shutdown
Syntax Description
ip-address Neighbor's IP address. peer-group-name Name of a BGP peer group.
To configure the Cisco IOS software to start storing updates, use the neighbor soft-reconfiguration router configuration command. To not store received updates, use the no form of this command.
neighbor {ip-address | peer-group-name} soft-reconfiguration [inbound]
Syntax Description
ip-address IP address of the BGP-speaking neighbor. peer-group-name Name of a BGP peer group. inbound (Optional) Keyword indicating that the update to be stored is an incoming update.
To set the timers for a specific Border Gateway Protocol (BGP) peer or peer group, use the neighbor timers router configuration command. To clear the timers for a specific BGP peer or peer group, use the no form of this command.
neighbor [ip-address | peer-group-name] timers keepalive holdtime
Syntax Description
ip-address (Optional) A BGP peer or peer group IP address. peer-group-name (Optional) Name of the BGP peer group. keepalive Frequency, in seconds, with which the Cisco IOS software sends keepalive messages to its peer. The default is 60 seconds. holdtime Interval, in seconds, after not receiving a keepalive message that the software declares a peer dead. The default is 180 seconds.
To have the Cisco IOS software allow internal Border Gateway Protocol (BGP) sessions to use any operational interface for TCP connections, use the neighbor update-source router configuration command. To restore the interface assignment to the closest interface, which is called the best local address, use the no form of this command.
neighbor {ip-address | peer-group-name} update-source interface
Syntax Description
ip-address IP address of the BGP-speaking neighbor. peer-group-name Name of a BGP peer group. interface Loopback interface.
To configure the Cisco IOS software to accept only a particular Border Gateway Protocol (BGP) version, use the neighbor version router configuration command. To use the default version level of a neighbor, use the no form of this command.
neighbor {ip-address | peer-group-name} version value
Syntax Description
ip-address IP address of the BGP-speaking neighbor. peer-group-name Name of a BGP peer group. value BGP version number. The version can be set to 2 to force the software to only use Version 2 with the specified neighbor. The default is to use Version 4 and dynamically negotiate down to Version 2 if requested.
To assign a weight to a neighbor connection, use the neighbor weight router configuration command. To remove a weight assignment, use the no form of this command.
neighbor {ip-address | peer-group-name} weight weight
Syntax Description
ip-address Neighbor's IP address. peer-group-name Name of a BGP peer group. weight Weight to assign. Acceptable values are 0 to 65535.
To specify the networks to be advertised by the Border Gateway Protocol (BGP) routing process, use the network router configuration command. To remove an entry, use the no form of this command.
network network-number [mask network-mask]
Syntax Description
network-number Network that BGP will advertise. mask (Optional) Network or subnetwork mask. network-mask (Optional) Network mask address.
To specify a backdoor route to a Border Gateway Protocol (BGP) border router that will provide better information about the network, use the network backdoor router configuration command. To remove an address from the list, use the no form of this command.
network address backdoor
Syntax Description
address IP address of the network to which you want a backdoor route.
To assign an absolute weight to a Border Gateway Protocol (BGP) network, use the network weight router configuration command. To delete an entry, use the no form of the command.
network address mask weight weight [route-map map-name]
Syntax Description
address IP address of the network. mask Network mask of the network. weight Absolute weight, or importance. It can be an integer from 0 to 65535. route-map map-name (Optional) Name of route map.
To configure the Border Gateway Protocol (BGP) routing process, use the router bgp global configuration command. To remove a routing process, use the no form of this command.
router bgp autonomous-system
Syntax Description
autonomous-system Number of an autonomous system that identifies the router to other BGP routers and tags the routing information passed along.
To modify an autonomous system path for Border Gateway Protocol (BGP) routes, use the set as-path route-map configuration command. To not modify the autonomous system path, use the no form of this command.
set as-path {tag | prepend as-path-string}
Syntax Description
tag Converts the tag of a route into an autonomous system path. Applies only when redistributing routes into BGP. prepend as-path-string Appends the string following the keyword prepend to the as-path of the route that is matched by the route map. Applies to inbound and outbound BGP route maps.
To remove communities from the community attribute of an inbound or outbound update, use the set comm-list delete router configuration command. To negate a previous set comm-list delete command, use the no form of this command.
set comm-list list-num delete
Syntax Description
list-num A standard or extended community list number.
To set the Border Gateway Protocol (BGP) COMMUNITIES attribute, use the set community route-map configuration command. To delete the entry, use the no form of this command.
set community {community-number [additive]} | none
Syntax Description
community-number Valid values are 1 to 4294967200, no-export, or no-advertise. additive (Optional) Adds the community to the already existing communities. none Removes the COMMUNITY attribute from the prefixes that pass the route-map.
To set the Border Gateway Protocol (BGP) route dampening factors, use the set dampening route-map configuration command. To disable this function, use the no form of this command.
set dampening half-life reuse suppress max-suppress-time
Syntax Description
half-life Time (in minutes) after which a penalty is decreased. Once the route has been assigned a penalty, the penalty is decreased by half after the half-life period (which is 15 minutes by default). The process of reducing the penalty happens every 5 seconds. The range of the half-life period is 1 to 45 minutes. The default is 15 minutes. reuse If the penalty for a flapping route decreases enough to fall below this value, the route is unsuppressed. The process of unsuppressing routes occurs at 10-second increments. The range of the reuse value is 1 to 20000; the default is 750. suppress A route is suppressed when its penalty exceeds this limit. The range is 1 to 20000; the default is 2000. max-suppress-time Maximum time (in minutes) a route can be suppressed. The range is 1 to 20000; the default is 4 times the half-life value. If the half-life value is allowed to default, the maximum suppress time defaults to 60 minutes.
To indicate where to output packets that pass a match clause of a route map for policy routing, use the set ip next-hop route-map configuration command. To delete an entry, use the no form of this command.
set ip next-hop ip-address [...ip-address] [peer-address]
Syntax Description
ip-address IP address of the next hop to which packets are output. It need not be an adjacent router. peer-address (Optional) Sets the next hop to be the BGP peering address.
Syntax Description
This command has no arguments or keywords.
Syntax Description
igp Remote Interior Gateway Protocol (IGP) system. egp Local Exterior Gateway Protocol (EGP) system. autonomous-system Remote autonomous system. This is an integer from 0 to 65535. incomplete Unknown heritage.
Syntax Description
weight Weight value. It can be an integer from 0 to 65535.
To display entries in the Border Gateway Protocol (BGP) routing table, use the show ip bgp EXEC command.
show ip bgp [network] [network-mask] [longer-prefixes]
Syntax Description
network (Optional) Network number, entered to display a particular network in the BGP routing table. network-mask (Optional) Displays all BGP routes matching the address/mask pair. longer-prefixes (Optional) Displays route and more specific routes.
To display routes with nonnatural network masks (that is, classless interdomain routing, or CIDR), use the show ip bgp cidr-only privileged EXEC command.
show ip bgp cidr-onlySyntax Description
This command has no arguments or keywords.
To display routes that belong to specified Border Gateway Protocol (BGP) communities, use the show ip bgp community EXEC command.
show ip bgp community community-number [exact]
Syntax Description
community-number Valid value is community number in the range 1 to 4294967200 or AA:NN (autonomous system-community number/2-byte number), internet, no-export, local-as, or no-advertise. exact (Optional) Displays only routes that have exactly the same specified communities.
To display routes that are permitted by the Border Gateway Protocol (BGP) community list, use the show ip bgp community-list EXEC command.
show ip bgp community-list community-list-number [exact]
Syntax Description
community-list-number Community list number in the range 1 to 99. exact (Optional) Displays only routes that have an exact match.
To display Border Gateway Protocol (BGP) dampened routes, use the show ip bgp dampened-paths EXEC command.
show ip bgp dampened-pathsSyntax Description
This command has no arguments or keywords.
To display routes that conform to a specified filter list, use the show ip bgp filter-list privileged EXEC command.
show ip bgp filter-list access-list-number
Syntax Description
access-list-number Number of an autonomous system path access list. It can be a number from 1 to 199.
To display Border Gateway Protocol (BGP) flap statistics, use the show ip bgp flap-statistics EXEC command.
show ip bgp flap-statistics [{regexp regexp} | {filter-list list} | {address mask [longer-prefix]}]
Syntax Description
regexp regexp (Optional) Clears flap statistics for all the paths that match the regular expression. filter-list list (Optional) Clears flap statistics for all the paths that pass the access list. address (Optional) Clears flap statistics for a single entry at this IP address. mask (Optional) Network mask applied to the address. longer-prefix (Optional) Displays flap statistics for more specific entries.
To display routes with inconsistent originating autonomous systems, use the show ip bgp inconsistent-as privileged EXEC command.
show ip bgp inconsistent-asSyntax Description
This command has no arguments or keywords.
To display information about the TCP and Border Gateway Protocol (BGP) connections to neighbors, use the show ip bgp neighbors EXEC command.
show ip bgp neighbors [address] [received-routes | routes | advertised-routes | {paths regular-expression} | dampened-routes]
Syntax Description
address (Optional) Address of the neighbor whose routes you have learned from. If you omit this argument, all neighbors are displayed. received-routes (Optional) Displays all received routes (both accepted and rejected) from the specified neighbor. routes (Optional) Displays all routes that are received and accepted. This is a subset of the output from the received-routes keyword. advertised-routes (Optional) Displays all the routes the router has advertised to the neighbor. paths regular-expression (Optional) Regular expression that is used to match the paths received. dampened-routes (Optional) Displays the dampened routes to the neighbor at the IP address specified.
To display all the Border Gateway Protocol (BGP) paths in the database, use the show ip bgp paths EXEC command.
show ip bgp paths
Syntax Description
This command has no arguments or keywords.
To display information about Border Gateway Protocol (BGP) peer groups, use the show ip bgp peer-group EXEC command.
show ip bgp peer-group [tag] [summary]
Syntax Description
tag (Optional) Displays information about that specific peer group. summary (Optional) Displays a summary of the status of all the members of a peer group.
To display routes matching the AS path regular expression, use the show ip bgp regexp privileged EXEC command.
show ip bgp regexp regular-expression
Syntax Description
regular-expression Regular expression to match the BGP autonomous system paths.
To display the status of all Border Gateway Protocol (BGP) connections, use the show ip bgp summary EXEC command.
show ip bgp summarySyntax Description
This command has no arguments or keywords.
To display information about a prefix list or prefix list entries, use the show ip prefix-list EXEC command.
show ip prefix-list [detail-summary] name [network/len] [seq seq-num] [longer] [first-match]
Syntax Description
detail-summary (Optional) Displays detailed or summarized information about all prefix lists. name (Optional) The name of a specific prefix list. network/len (Optional) The network number and length (in bits) of the network mask. seq (Optional) Applies the sequence number to the prefix list entry. seq-num The sequence number of the prefix list entry. longer Displays all entries of a prefix list that are more specific than the given network/len. first-match Displays the entry of a prefix list that matches the given network/len.
To enable the synchronization between Border Gateway Protocol (BGP) and your Interior Gateway Protocol (IGP) system, use the synchronization router configuration command. To enable the Cisco IOS software to advertise a network route without waiting for the IGP, use the no form of this command.
synchronizationSyntax Description
This command has no arguments or keywords.
To modify metric and tag values when the IP routing table is updated with Border Gateway Protocol (BGP) learned routes, use the table-map router configuration command. To disable this function, use the no form of the command.
table-map route-map-name
Syntax Description
route-map-name Route-map name, from the route-map command.
To adjust Border Gateway Protocol (BGP) network timers, use the timers bgp router configuration command. To reset the BGP timing defaults, use the no form of this command.
timers bgp keepalive holdtime
Syntax Description
keepalive Frequency, in seconds, with which the Cisco IOS software sends keepalive messages to its peer. The default is 60 seconds. holdtime Interval, in seconds, after not receiving a keepalive message that the software declares a peer dead. The default is 180 seconds.
Posted: Wed Jul 26 13:56:22 PDT 2000
Copyright 1989-2000©Cisco Systems Inc.