Setting The Administrative Distance For A Route - Motorola BSR 2000 Configuration And Management Manual

BSR 2000 Configuration and Management Guide
Example
The commands in the following example, configure the keepalive frequency and
holdtime interval for BGP on a BSR and configure the keepalive frequency and
holdtime interval for a BGP peer:

Setting the Administrative Distance for a Route

An administrative distance is a rating of the trustworthiness of a routing information
source, such as a router or group of routers. The administrative distance is an integer
between 0 and 255 with a higher value indicating a lower trust rating. An
administrative distance of 255 denotes a routing information source that cannot be
trusted and should be ignored. Routes with distances of 255 are not installed in the
routing table.
You can change an administrative distance if you know that another protocol provides
a better route than that learned via EBGP or if you want IBGP to show preference for
internal routes.
Note: Changing the administrative distance of BGP internal routes is
dangerous and is not recommended. It can cause the accumulation of routing
table inconsistencies that can break routing within an AS and between ASs.
To set the following three administrative distance types, use the distance bgp
command:
Use the distance bgp command in Router Configuration mode to set the external,
internal, and local administrative distances for a BGP router:
MOT(config-bgp)# distance bgp [<1-255> <1-255> <1-255>]
where:
12-32
MOT(config)#router bgp 100
MOT(config-bgp)#timers bgp 80 200
MOT(config-bgp)#neighbor 192.56.20.2 timers 80 200
external — for BGP external routes learned from a neighbor external to the AS.
internal — for BGP internal routes learned from another BGP router within the
same AS.
local — for local BGP routes that are networks listed with the network
command, often as back doors for that router or for networks that are
redistributed from another process.
MGBI
Release 1.0
526360-001-00 Rev. B