Cisco Catalyst 4500 Series Software Configuration Manual page 1661

Chapter 62 Configuring Network Security with ACLs
Table 62-1
ACL Type(s)
1. Input Router ACL
2. VACL
VACL + Input Router
3.
ACL
Each ACL type listed in
Scenario 1: Host A is connected to an interface in VLAN 20, which has an SVI configured. The interface
has input PACL configured, and the SVI has input Router ACL configured as shown in
Figure 62-7 Scenario 1: PACL Interaction with an Input Router ACL
Host A
(VLAN 10)
If the interface access group mode is prefer port, then only the input PACL is applied on the ingress
traffic from Host A. If the mode is prefer VLAN, then only the input Router ACL is applied to ingress
traffic from Host A that requires routing. If the mode is merge, then the input PACL is first applied to
the ingress traffic from Host A, and the input Router ACL is applied on the traffic that requires routing.
Scenario 2: Host A is connected to an interface in VLAN 10, which has a VACL (VLAN Map)
configured and an input PACL configured as shown in
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Interaction between PACLs, VACLs, and Router ACLs
Input PACL
prefer port
mode
PACL applied
PACL applied
PACL applied
Table 62-1
Input
PACL
Frame
VLAN 10
prefer vlan
mode
Input Router
ACL applied
VACL
applied
VACL +
Input Router
ACL applied
corresponds with these scenarios:
Catalyst 4500 series switch
Input
router
ACL
Routing function
Packet
Figure
Using PACL with VLAN Maps and Router ACLs
merge mode
PACL, Input Router ACL (merged)
applied in order (ingress)
PACL, VACL (merged) applied in order
(ingress)
PACL, VACL, Input Router ACL
(merged) applied in order (ingress)
Output
PACL
Host B
(VLAN 20)
VLAN 20
62-8:
Figure 62-7:
62-37