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We'll create three zone pairs to meet our requirements: Finally, we'll define and apply our security policies to the zone pairs.
Policies are defined as inspection policy maps, which are very similar in construct to policy maps used for quality of service (Qo S) classification and marking.
We want to inspect all traffic outbound to the Internet so that return traffic is allowed statefully.
Unfortunately, we can't use the action with the default class map, so we'll need to create a custom class map to match the base protocols TCP, UDP, and ICMP.
A security zone is a group of routed interfaces which are intended to be treated similarly from a security perspective.
For example, if you have two redundant Internet connections from an edge router, both could be placed into a shared "untrusted" zone: It is irrelevant from a security perspective which is the primary connection and which is for failover.
The topology below illustrates a design applicable to what was discussed above, employing three distinct security zones comprising five logical connections.
IOS 15.0(1)M7 was used in the lab for this article.
In our lab, Fast Ethernet0/0 is an IEEE 802.1Q trunk to the core LAN switch carrying the data (1), voice (10), and guest wireless (99) VLANs.
Fast Ethernet0/1 connects to the MPLS WAN and Fast Ethernet0/2/0 connects to a broadband Internet circuit.
A connection into the internal network, however, would be assigned to a separate, trusted zone.
Additional zones can also be created with levels of trust which might fall in between the two; for example, a guest wireless network or corporate extranet.