Setting The Administrative Distance For A Route; Table 21: Default Administrative Distances For Route Sources - Juniper BGP - CONFIGURATION GUIDE V 11.1.X Configuration Manual

JUNOSe 11.1.x BGP and MPLS Configuration Guide
To configure router Chicago:
To configure router LA:
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 in the routing table. As shown in Table 21 on page 136,
default distances are provided for each type of source from which a route can be
learned.

Table 21: Default Administrative Distances for Route Sources

136
Interactions Between BGP and IGPs
host4(config)#router bgp 200
host4(config-router)#neighbor 3.3.3.1 remote-as 100
host5(config)#router bgp 300
host5(config-router)#neighbor 1.1.1.1 remote-as 100
host5(config-router)#network 192.56.0.0
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.
Route Source
Connected interface
Static route
External BGP
OSPF
IS-IS
RIP
Internal BGP
Unknown
Default Distance
0
1
20
110
115
120
200
255