Ø
Metric:- is
only an attribute you have to try and influence other Autonomous Systems
2
methods to Setup the Metric
1st is set the metric globally
Our
goal is All the Traffic coming from ISP {or different AS} to reach our enterprise
networks using R1 (as a gateway} not R4.
To
do this we Set higher metric in R4 {default metric is 0} lower metric is better
in BGP scenario and oblivious all traffic coming from R1
Configuration
Ø
R4(config)#
bgp 65001
Ø
R4(config-router)#default-metric
100
Ø
R4#clear
ip bgp * soft {Resetting the BGP Process}
All Router in ISP side Choose R1 to Reach
2nd Method
using Route-map command
Ø
Our
Goals is influence the ISP{or different AS} to reach enterprise network using R4
Ø
To
do this we will set the higher metric on R1 and automatically all the ISP
traffic coming through R4 because lower metric is better
Ø
R1(config)#route-map
DENY_R1 permit 10 DENY_R1:- Route-map Name
Ø
R1(config-router-map)#
set metric 200
R1 metric is higher than R4 {default is 0} and All
ISP side Traffic coming to enterprise network using R4
Apply the Route-map into R1 BGP Process
Ø
R1(config)#router
bgp 65001
Ø
R1(config-router)#neighbor
100.100.100.17 route-map DENY_R1 out Apply outgoing routes
Ø
clear
ip bgp * soft Resetting the BGP Process
Great Article
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