Deployment Guide

330 | Border Gateway Protocol IPv4 (BGPv4)
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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 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; hence the value set in that attribute-map will not be shown in the output of the show ip
bgp aggregate route
command.
Command
History
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bgp always-compare-med
c e s
Enables 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.
Defaults
Disabled (that is, the software only compares MEDs from neighbors within the same AS).
Command Modes
ROUTER BGP
Usage
Information
Any update without a MED attribute is the least preferred route
If you enable this command, use the clear ip bgp ipv4 unicast soft * command to recompute the best
path.
(For C-series only) If you enable this command, use the clear ip bgp * command to recompute the
best path.
Command
History
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bgp asnotation
c e s
Enables you to implement a method for AS Number representation in the CLI.
Syntax
bgp asnotation [asplain | asdot+ | asdot]
To disable a dot or dot+ representation and return to ASPLAIN, enter no bgp asnotation.
Defaults
asplain
Version 7.8.1.0 Introduced support on S-Series
Version 7.7.1.0 Introduced support on C-Series
Version 8.2.1.0 Introduced command
Version 7.7.1.0 Introduced support on C-Series