Reference Guide

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 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.
bgp always-compare-med
Allows you to enable comparison of the MULTI_EXIT_DISC (MED) attributes in the paths from different
external ASs.
C9000 Series
Syntax
bgp always-compare-med
To disable comparison of MED, use the no bgp always-compare-med
command.
Defaults Disabled (that is, the software only compares MEDs from neighbors within the
same AS).
Command Modes ROUTER BGP
Command History
Version Description
9.9(0.0) Introduced on the C9010.
9.2(1.0) Introduced on the Z9500.
8.2.1.0 Introduced on the E-Series ExaScale.
7.4.1.0 Introduced
Usage Information
Any update without a MED attribute is the least preferred route.
532
Border Gateway Protocol