192.30.0.0/16 in its IP routing table and advertise it to router LA without learning about
192.30.00/16 from router Albany.
To configure router Boston:
host1((config)#router bgp 100
host1(config-router)#neighbor 2.2.2.2 remote-as 100
host1(config-router)#neighbor 4.4.4.1 remote-as 100
host1(config-router)#neighbor 1.1.1.2 remote-as 300
host1(config-router)#no synchronization
To configure router NY:
host2(config)#router bgp 100
host2(config-router)#neighbor 3.3.3.2 remote-as 200
host2(config-router)#neighbor 2.2.2.1 remote-as 100
host2(config-router)#neighbor 4.4.4.3 remote-as 100
host2(config-router)#no synchronization
To configure router Albany:
host3(config)#router bgp 100
host3(config-router)#neighbor 4.4.4.4 remote-as 100
host3(config-router)#neighbor 4.4.4.2 remote-as 100
host3(config-router)#no synchronization
To configure router Chicago:
host4(config)#router bgp 200
host4(config-router)#neighbor 3.3.3.1 remote-as 100
To configure router LA:
host5(config)#router bgp 300
host5(config-router)#neighbor 1.1.1.1 remote-as 100
host5(config-router)#network 192.56.0.0
synchronization
• Use to enable and disable synchronization between BGP and an IGP.
• Synchronization is enabled by default. However, creating an address family for a VRF
automatically disables synchronization for that address family.
• This command takes effect immediately.
• Use the no version to advertise a route without waiting for the IGP to learn a route to
the prefix.
• See synchronization.
Setting the Administrative Distance for a Route
The administrative distance is an integer in the range 0–255 that is associated with each
route known to a router. The distance represents how reliable the source of the route is
considered to be. A lower value is preferred over a higher value. An administrative distance
of 255 indicates no confidence in the source; routes with this distance are not installed
133Copyright © 2010, Juniper Networks, Inc.
Chapter 1: Configuring BGP Routing
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