If this is an IOS switch:
If you are trying to filter an IP address. Use ACL number between 1-99.
e.g
access-list 1 deny host 172.16.1.1
access-list 1 permit any

PING

Christian Fredrickson wrote:

> Running a Cisco switch 3548XL
> Trying to block a specific IP address. The access-list looks like:
> (I substituted the IP addresses)
> access-list 2000 deny   ip host ip_address any
> access-list 2000 permit ip range.0 0.0.0.255 any
> access-list 2000 deny   ip any any
>
> All ports on this switch belong to the same VLAN and all other switches use
> this switch to get to the upper layer switch and use that to get to the
> router. The vlan looks like:
> (I substituted the IP addresses)
> interface VLAN1
>  description line
>  ip address switch_ip 255.255.255.0
>  ip access-group 2000 in
>
> But I can still ping the host from external addresses. Why is this ACL not
> working?
>
> Thank you all in advance.




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