BGP Distribute list

Question 1

What is a BGP Distribute list?

Answer 1

A BGP Distribute list is a way to filter routing updates based on an access list or a prefix list, which is applied to updates to and from neighbors.

Question 2

How does a BGP Distribute list work?

Answer 2

A BGP Distribute list performs route filtering based on advertised networks.

The distribute list refers to an access list or a prefix list to match networks and can be applied in any direction, either inbound or outbound.

Question 3

How do I configure a BGP Distribute list?

Answer 3

• The distribute-list command is used to apply to the neighbor statement.
• The access list with the number 101 filters the incoming updates.
• (in) represents incoming BGP updates from the neighbor 192.168.4.1 1.

router bgp 109
network 10.108.0.0
neighbor 192.168.4.1 distribute-list 101 in

Question 4

What are some considerations when using a BGP Distribute list?

Answer 4

When using a BGP Distribute list, it’s important to consider factors such as:

1. How to configure the access list or prefix list used by the distribute-list.
2. Which neighbors to apply the distribution list too?
3. Whether to apply it inbound or outbound.