What is OSPF distribute list?

The outbound distribute-list is exclusively used to filter OSPF routes in route redistribution between OSPF and a different routing protocol or OSPF process. The distribute-list in can be applied to any router within the area. A standard access-list or a prefix-list may be used.

How do you filter prefixes with distribute list?

Go to the configuration of the EIGRP process and use the distribute-list command to see your options. As you can see we can choose between an access-list, a prefix-list or a route-map.

Can I use the distribute list in out command with OSPF to filter routes?

In OSPF, the external routes could be Type 1 or Type 2. Users can create route maps to match either Type 1 or Type 2 and then use the distribute-list in command to filter certain prefixes. Also, route maps can identify internal routes (interarea and intra-area) and then those routes can be filtered.

How do you set up a distribute list?

To configure a distribution list for the Enhanced Interior Gateway Routing Protocol (EIGRP) on an interface, use the ip distribute-list eigrp command. To restore the default, use the no form of this command.

What is distribute list?

A distribute-list is used to control routing updates either coming TO your router or leaving FROM your router. Distribute-lists work on a variety of different IOS routing protocols. Because of that, learning how to use distribute-lists is very valuable.

How many types of OSPF areas are there?

five types
There are five types of OSPF areas: Backbone area (area 0), Standard area, Stub area, Totally stubby area, and No so stubby area (NSSA).

How do you set up a prefix list?

By using the ip prefix-list command you can create prefix lists. As you can see it looks a bit similar as my access-list but instead of typing wildcards we just specify the number of bits. The first line denies 172.16. 1.0/24 and the second line permits 0.0.

What is difference between access-list and prefix list?

1) Access-list is resource consumptive compared to prefix list. 2) Access-list only checks network portion, whereas Prefix list checks both network portion and subnet mask for filtering. 3) Access-list is more flexible compared to prefix-list( because access-list checks bit by bit for filtering purpose).

What is Type 3 LSA?

The Summary (Type 3) LSA is used for advertising prefixes learned from the Type 1 and Type 2 LSAs into a different area. The Area Border Router (ABR) is the OSPF device that separates areas and it is this device that advertises the Type 3 LSA.

What is Area 0 called in OSPF?

backbone area
The backbone area (Area 0) is the core of an OSPF network. All other areas are connected to it and all traffic between areas must traverse it. All routing between areas is distributed through the backbone area.

How to filter prefixes with distribute-list with OSPF?

Prefixes that are advertised by routing protocols like OSPF, EIGRP or RIP can be filtered. One way of doing this is by using a distribute-list. In this lesson I’ll give you an example of how to filter certain prefixes with a distribute-list. Filtering can occur inbound or outbound.

How to filter route filtering using prefix lists?

Creates an outbound distribute list to filter routes being redistributed from EIGRP into OSPF that references the prefix list. NOTE: The implicit deny any statement at the end of the prefix list prevents routing updates about any other network from being advertised.

How to filter outbound routes in OSPF?

Redistributes all EIGRP networks into OSPF. Creates an outbound distribute list to filter routes being redistributed from EIGRP into OSPF. NOTE: The implicit “deny any” state-ment at the end of the access list pre-vents routing updates about any other network from being advertised.

How to filter prefixes with distribute-list in EIGRP?

If we look at the routing table of router R1 we can see all those networks on the loopback interfaces as it should be. Now we’ll see if we can do some filtering. Go to the configuration of the EIGRP process and use the distribute-list command to see your options. As you can see we can choose between an access-list, a prefix-list or a route-map.