GRE - Recursive routing error - filtering solution


When a distribute list references an extended [ACL](/acl), in some versions of Cisco, you may receive the following error message:

`% The ACL cannot be created or an ACL with the same name but incompatible type already exists.`

For example, take the following set of configurations that attempts to filter BGP advertisements using extended access-list filtering:

```
R1(config)#ip access-list extended ACL-LIMIT-R2-NETWORKS
R1(config-ext-nacl)#permit ip 172.16.0.0 0.0.255.255 255.255.255.0 0.0.0.0 R1(config-ext-nacl)#router bgp 1 
R1(config-router)#distribute-list ACL-LIMIT-R2-NETWORKS IN 
% The ACL cannot be created or an ACL with the same name but incompatible type already exists. 
R1(config-router)#
```

However, when using a numbered extended access list, the command is accepted without a problem.

Links:

https://community.cisco.com/t5/routing/eigrp-distribute-list-and-extended-access-lists/td-p/3902374

https://forum.networklessons.com/t/bgp-extended-access-list-filtering/1294/47?u=lagapides

https://networklessons.com/bgp/bgp-extended-access-list-filtering

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Distribute-lists and named extended ACLs

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