Cisco Systems 78-11741-02 Wireless Office Headset User Manual


 
Configuring BGP
Configuring Basic BGP Features
IPC-310
Cisco IOS IP Configuration Guide
The configuration of this feature in conjunction with the iBGP Multipath Load Sharing feature allows
you to use an outbound route map to include BGP route reflectors in the forwarding path.
The BGP Next Hop Propagation feature allows you to perform the following tasks:
Bring the route reflector into the forwarding path, which can be used with the iBGP Multipath Load
Sharing feature to configure load balancing.
Configure interprovider Multiprotocol Label Switching (MPLS) Virtual Private Networks (VPNs)
by not modifying the next hop attribute when advertising routes to an eBGP peer.
Turn off the next hop calculation for an eBGP peer. This feature is useful for configuring the
end-to-end connection of a label-switched path.
To configure an eBGP multihop peer to propagate the next hop unchanged, use the following command
in router configuration mode:
Configuring the BGP Version
By default, BGP sessions begin using BGP Version 4 and negotiating downward to earlier versions if
necessary. To prevent negotiation and force the BGP version used to communicate with a neighbor, use
the following command in router configuration mode:
Configuring the MED Metric
BGP uses the MED metric as a hint to external neighbors about preferred paths. (The name of this metric
for BGP Versions 2 and 3 is INTER_AS_METRIC.) To set the MED of the redistributed routes, Use the
following command in router configuration mode. All the routes without a MED will also be set to this
value.
Alternatively, you can set the MED using the route-map router configuration command. See the “BGP
Route Map Examples” section at the end of this chapter for examples of using BGP route maps.
Command Purpose
Router(config-router)# neighbor ip-address
next-hop-unchanged
Configures the router to send BGP updates to BGP peers
without modifying the next hop attribute.
Caution This command should be configured only on
route-reflector clients and not on a route reflector.
Command Purpose
Router(config-router)# neighbor {ip-address |
peer-group-name} version number
Specifies the BGP version to use when communicating with
a neighbor.
Command Purpose
Router(config-router)# default-metric number
Sets an MED.