To create an aggregate entry in a BGP or multiprotocol BGP routing table if any more-specific BGP or multiprotocol BGP routes are available that fall in the specified range, use the command aggregate-address in BGP Router Configuration Mode. The entries in the table specifies the IP address based on which the routing information has to be aggregated. The aggregate route will be advertised as coming from autonomous system. The atomic aggregate attribute will be set only if some of the information in the AS PATH is missing in the aggregated route, else it will not be set.The no form of the command deletes the specified entry from the aggregate table.
| Parameter | Type | Description |
|---|---|---|
index
|
Enter to configure the entry containing information about the IP address on which the aggregation has to be done.. | |
<1-100>
|
Integer | Enter a value for the entry containing information about the IP address on which the aggregation has to be done |
<ip-address>
|
Enter to configure the route prefix in the Network Layer Reachability Information on which aggregate policy needs to be applied. | |
<prefixlen>
|
Enter to configure the number of high-order bits in the IP address. These bits are common among all hosts within a network. This value ranges from 0 to 32 for IPv4 address and between 0 and 128 for IPv6 Address. | |
[summary-only]
|
Enter to specify that aggregated (summarized) route alone will be sent to the peers. If this is not specified , both the summary and the more-specific routes based on which the summary entry was generated are be advertised to the peers | |
[as-set]
|
Enter to generate autonomous system set path information. | |
[suppress-map map-name]
|
Enter to specify the name of the route map used to select the routes to be suppressed. The route map contains the rules for suppressing the more-specific routes in forming the aggregate route. When suppress-map configuration is used along with summary only option, summary-only configuration command doesn't have any effect. And the more-specific routes that the suppress-map suppresses are not advertised. Other routes are advertised in addition to the aggregated route. This value is a string with a maximum length of 20. | |
[advertise-map map-name]
|
Integer | Enter to specify the name of the route map used to select for forming aggregate routes. The route map contains the rules for selecting specific routes for aggregation Other routes are advertised. When advertise-map is used, only advertise-map influences the creation of aggregate entry. In absence of advertise-map, the aggregate route inherits the attributes of the more specific routes, both suppressed and unsuppressed.This value is a string with a maximum length of 20. |
[attribute-map map-name]
|
Enter to specify the name of the route map used to form the attribute of the aggregate route. The route map contains the rules for setting the attributes for the aggregated route. When attribute-map and advertise-map along with autonomous system set path information are enabled and other configurations, the attribute-map overrides the attribute that is formed with the routes selected by the advertise-map.. This value is a string with a maximum length of 200 |
BGP Router Configuration Mode
The IP address and the prefix length can be configured, only if the Aggregate admin status of the BGP is down.
iS5Comm(config-router)# aggregate-address index 1 21.1.0.0 16 summary-only