Cisco Catalyst 3750-E Series, Software Configuration Manual

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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-08
Chapter 35 Configuring Network Security with ACLs
Configuring VLAN Maps
Figure 35-4 Wiring Closet Configuration
If you do not want HTTP traffic switched from Host X to Host Y, you can configure a VLAN map on
Switch A to drop all HTTP traffic from Host X (IP address 10.1.1.32) to Host Y (IP address 10.1.1.34)
at Switch A and not bridge it to Switch B.
First, define the IP access list http that permits (matches) any TCP traffic on the HTTP port.
Switch(config)# ip access-list extended http
Switch(config-ext-nacl)# permit tcp host 10.1.1.32 host 10.1.1.34 eq www
Switch(config-ext-nacl)# exit
Next, create VLAN access map map2 so that traffic that matches the http access list is dropped and all
other IP traffic is forwarded.
Switch(config)# vlan access-map map2 10
Switch(config-access-map)# match ip address http
Switch(config-access-map)#
action drop
Switch(config-access-map)# exit
Switch(config)# ip access-list extended match_all
Switch(config-ext-nacl)# permit ip any any
Switch(config-ext-nacl)# exit
Switch(config)# vlan access-map map2 20
Switch(config-access-map)# match ip address match_all
Switch(config-access-map)#
action forward
Then, apply VLAN access map map2 to VLAN 1.
Switch(config)# vlan filter map2 vlan 1
Denying Access to a Server on Another a VLAN
You can restrict access to a server on another VLAN. For example, server 10.1.1.100 in VLAN 10 needs
to have access denied to these hosts (see
Figure 35-5 ):
•
Hosts in subnet 10.1.2.0/8 in VLAN 20 should not have access.
•
Hosts 10.1.1.4 and 10.1.1.8 in VLAN 10 should not have access.
Switch A Switch C
Switch B
VLAN map: Deny HTTP
from X to Y.
HTTP is dropped
at entry point.
Host X
10.1.1.32
Host Y
10.1.1.34
VLAN 1
VLAN 2
Packet
101355