BGP

[eslam.farag]

If you change the weight and distance parameters on a device with an established bgp neighbor, which additional task must you perform to allow two devices to continue exchanging routes ?

A. reset the BGP connections on the device

B. Change the weight and distance settings on the other device to match

C. Clear the IP routers on the device

D. reset the gateway interface

[Jaderson Pessoa]

If you change the weight and distance parameters on a device with an established bgp neighbor, which additional task must you perform to allow two devices to continue exchanging routes ?

A. reset the BGP connections on the device

B. Change the weight and distance settings on the other device to match

C. Clear the IP routers on the device

D. reset the gateway interface

[eslam.farag]

thank you Jaderson,
can you tell me please why answer 'a' is incorrect.
thanks in advance

[Jaderson Pessoa]

Managing Routing Policy Changes

When the routing policy of a BGP neighbor changes, the session must be reset (cleared) for the changes to take effect. Because resetting a BGP session can be disruptive to networks, a soft reset method is recommended for reconfiguring the routing table.

In order to reconfigure the inbound routing table before the introduction of this feature, both the local BGP router and the BGP peer first needed to be configured to store incoming routing policy updates using the neighbor soft-reconfiguration command. Additional resources, particularly memory, were required to store the inbound routing table updates. The clear ip bgp command could then initiate the soft reset, which generated a new set of inbound routing table updates using the stored information.

Requires No Preconfiguration

Because support for the soft reset using the route refresh capability is included in this release of the Cisco IOS software, no further router configuration is required. You can initiate a soft inbound reset using only the clear ip bgp in command.

Check it fore more information:

https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/s_sftrst.html

[Reza Sharifi · Accepted solution]

Have a look at the config guide:

The tasks in this section are concerned with the resetting and display of information about basic BGP processes and peer relationships. Once you have defined two routers to be BGP neighbors, they will form a BGP connection and exchange routing information. If you subsequently change a BGP filter, weight, distance, version, or timer, or make a similar configuration change, you may have to reset BGP connections for the configuration change to take effect.

Link:

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/15-s/irg-15-s-book/irg-basic-net-0.html

HTH

[Jaderson Pessoa · Accepted solution]

Sorry, i marked wrong, it is A correct: A. reset the BGP connections on the device