Dell C1048P Port Extender Networking Command-Line Reference Guide for the C900 - Page 532

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 aggregateaddress 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