Wiring Closet Configuration - Cisco WS-C3750-48PS-S Software Configuration Manual

Chapter 31 Configuring Network Security with ACLs

Wiring Closet Configuration

In a wiring closet configuration, routing might not be enabled on the switch. In this configuration, the
switch can still support a VLAN map and a QoS classification ACL. In
and Host Y are in different VLANs and are connected to wiring closet switches A and C. Traffic from
Host X to Host Y is eventually being routed by Switch B, a Layer 3 switch with routing enabled. Traffic
from Host X to Host Y can be access-controlled at the traffic entry point, Switch A.
Figure 31-4 Wiring Closet Configuration
VLAN map: Deny HTTP
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
78-16180-02
Switch A
from X to Y.
HTTP is dropped
at entry point.
10.1.1.32
VLAN 1
VLAN 2
Packet
Switch B
Host X Host Y
10.1.1.34
Catalyst 3750 Switch Software Configuration Guide
Configuring VLAN Maps
Figure 31-4, assume that Host X
Switch C
31-35