Reference Guide

IPv6 Border Gateway Protocol (IPv6 BGP) | 797
Defaults
Not configured.
Command Modes
CONFIGURATION-ROUTER-BGPV6-ADDRESS FAMILY
Command
History
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.
Do not add the
as-set parameter to the aggregate, if routes within the aggregate are
constantly changing as the aggregate will flap 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 true: routes
meeting the
permit clause are suppressed.
If the route is injected via the network command, that route will still appear 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 ipv6 unicast command, aggregates contain an ‘a’ in the first
column and routes suppressed by the aggregate contain an ‘s’ in the first column.
bgp always-compare-med
c e
Allows you to enable comparison of the MULTI_EXIT_DISC (MED) attributes in
the paths from different external ASs.
Syntax
bgp always-compare-med
To disable comparison of MED, enter no bgp always-compare-med.
attribute-map
map-name
(OPTIONAL) Enter the keywords attribute-map followed by 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 will not be advertised.
suppress-map
map-name
(OPTIONAL) Enter the keywords suppress-map followed by the name of
a configured route map to identify which more-specific routes in the
aggregate are suppressed.
Version 8.3.19.1 Introduced on S4820T
Version 8.4.2.1 Introduced on C-Series and S4810
Version 8.2.1.0 Introduced on E-Series ExaScale
Version 7.4.1.0 Introduced on E-Series TeraScale