You need to configure eBGP on the rtrA and rtrB routers, as shown in the following image:

Last Updated on August 1, 2021 by Admin 1

You need to configure eBGP on the rtrA and rtrB routers, as shown in the following image:

300-410 Part 06 Q10 077
300-410 Part 06 Q10 077

You have configured eBGP on rtrA through the following commands:

rtrA(config)# router bgp 501
rtrA(config)# neighbor 201.60.3.2 remote-as 505

While configuring eBGP on rtrB, you need to ensure that updates about the 192.168.58.0/24 and the 192.168.127.0/24 subnets are sent to rtrA with a metric of 300. In addition, rtrB should send updates about the 172.161.94.0/24 subnet are sent with a metric of 500.

Which of the following set of commands would NOT be part of the set used to correctly configure eBGP on rtrB?

  • access-list 1 permit 192.168.0.0 0.0.255.255
    access-list 2 permit 172.161.94.0 0.0.0.255
    router bgp 505
    neighbor 201.60.3.1 remote-as 501
    neighbor 201.60.3.1 route-map change_parameters in
  • access-list 1 permit 192.168.0.0 0.0.255.255
    access-list 2 permit 172.161.94.0 0.0.0.255
    router bgp 505
    neighbor 201.60.3.1 remote-as 501
    neighbor 201.60.3.1 route-map change_parameters out
  • route-map change_parameters permit 10
    match ip-address 2
    set metric 500
  • route-map change_parameters permit 20
    match ip-address 1
    set metric 300
Explanation:
The following command set would NOT be used because it only applies the access list route-map change_parameters inbound instead of outbound, as would be required:

300-410 Part 06 Q10 078
300-410 Part 06 Q10 078

The ACL 1 allows the 192.168.58.0/24 and the 192.168.127.0/24 subnets, while the ACL 2 allows the 172.161.94.0/24 subnet. The neighbor route-map command specifies a route-map named change_parameters for the 201.60.3.1 BGP peer. The out keyword at the end of the command indicates that the route-map is applied only to the updates sent by rtrB, and not received by rtrB.

In the following command, the route map change_parameters is defined with the permit keyword. The permit keyword indicates that if a match occurs, the actions specified in the set sub-command are executed:

route-map change_parameters permit 10
match ip-address 2
set metric 500

In this case, this command checks if the IP address of the subnets advertised to rtrA is in the 172.161.94.0/24 subnet (specified by ACL 2). If the IP address matches, then the metric of those routes are set to 500.

In the following command, the route map change_parameters is defined with the permit keyword:

route-map change_parameters permit 20
match ip-address 1
set metric 300

In this case, this command checks if the IP address of the subnets advertised to rtrA is in the 192.168.58.0/24 or the 192.168.127.0/24 subnets (specified by ACL 1) If the IP address matches, then the metric of those routes are set to 300.

Objective:
Layer 3 Technologies
Sub-Objective:
Configure and verify eBGP (IPv4 and IPv6 address families)

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