Dell Command Line Reference Guide for the S4048–ON System 9.14.2.5

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aggregate-address

To minimize the number of entries in the routing table, summarize a range of prefixes.

Syntax
aggregate-address ip-address mask [advertise-map map-name] [as-set] [attribute-map map-name] [summary-only] [suppress-map map-name]
Parameters
ip-address mask
Enter the IP address and mask of the route to be the aggregate address. Enter the IP address in dotted decimal format (A.B.C.D) and mask in /prefix format (/x).
advertise-map map-name
(OPTIONAL) Enter the keywords advertise-map then the name of a configured route map to set filters for advertising an aggregate route.
as-set

(OPTIONAL) Enter the keyword as-set to generate path attribute information and include it in the aggregate.

AS_SET includes AS_PATH and community information from the routes included in the aggregated route.

attribute-map map-name
(OPTIONAL) Enter the keywords attribute-map then the name of a configured route map to modify attributes of the aggregate, excluding AS_PATH and NEXT_HOP attributes.
summary-only
(OPTIONAL) Enter the keyword summary-only to advertise only the aggregate address. Specific routes are not advertised.
suppress-map map-name
(OPTIONAL) Enter the keywords suppress-map then the name of a configured route map to identify which more-specific routes in the aggregate are suppressed.
Defaults
Not configured.
Command Modes
  • ROUTER BGP ADDRESS FAMILY
  • ROUTER BGP ADDRESS FAMILY IPv6
Command History

This guide is platform-specific. For command information about other platforms, see the relevant Dell EMC Networking OS Command Line Reference Guide.

Version
Description
9.10(0.1)
Introduced on the S6010-ON and S4048T-ON.
9.10(0.0)
Introduced on the S3148.
9.8(2.0)
Introduced on the S3100 series.
9.8(0.0P5)
Introduced on the S4048-ON.
9.8(0.0P2)
Introduced on the S3048-ON.
9.7(0.0)
Introduced on the S6000–ON.
9.2(1.0)
Introduced on the Z9500.
9.0.2.0
Introduced on the S6000.
8.3.19.0
Introduced on the S4820T.
8.3.11.1
Introduced on the Z9000.
8.3.7.0
Introduced on the S4810.
7.8.1.0
Introduced on the S-Series.
7.7.1.0
Introduced on the C-Series.
Usage Information

At least one of the routes included in the aggregate address must be in the BGP routing table for the configured aggregate to become active.

If routes within the aggregate are constantly changing, do not add the as-set parameter to the aggregate as the aggregate flaps to keep track of the changes in the AS_PATH.

In route maps used in the suppress-map parameter, routes meeting the deny clause are not suppress; in other words, they are allowed. The opposite is also true: routes meeting the permit clause are suppressed.

If the route is injected via the network command, that route still appears in the routing table if the summary-only parameter is configured in the aggregate-address command.

The summary-only parameter suppresses all advertisements. If you want to suppress advertisements to only specific neighbors, use the neighbor distribute-list command.

In the show ip bgp command, aggregates contain an ‘a’ in the first column and routes suppressed by the aggregate contain an ‘s’ in the first column.

When an aggregate address ​is denied using a peer's outbound route-map, individual routes suppressed by the aggregate address are advertised to that peer.

The attribute-map corresponding to an aggregate address is applied during the outbound update creation time; the value set in that attribute-map will not be shown in the output of the show ip bgp aggregate route command.


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