Chapter 12: Policy Manager Commands - Extreme Networks ExtremeWare XOS Command Reference Manual

12 Policy Manager Commands
This chapter describes commands for:
Creating and configuring policy files for IP access lists (ACLs)
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Creating and configuring policy files for routing policies
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Policies are a generalized category of features that impact forwarding and route forwarding decisions.
Access policies are used primarily for security and quality of service (QoS) purposes.
IP access lists (also referred to as Access Lists or ACLs) consist of IP access rules and are used to perform
packet filtering and forwarding decisions on traffic traversing the switch. Each packet on an interface is
compared to the access list in sequential order and is either forwarded to a specified QoS profile or
dropped. Additionally, for the BlackDiamond 8800 family and Summit X450 switches only, packets can
be metered using ACLs. Using access lists has no impact on switch performance.
Access lists are typically applied to traffic that crosses layer 3 router boundaries, but it is possible to use
access lists within a layer 2 VLAN. Extreme products are capable of performing this function with no
additional configuration.
Routing policies are used to control the advertisement or recognition of routes from routing protocols,
such as RIP, OSPF, or BGP. Routing policies can be used to 'hide' entire networks or to trust only
specific sources for routes or ranges of routes. The capabilities of routing policies are specific to the type
of routing protocol involved, but are sometimes more efficient and easier to implement than access lists.
NOTE
Although ExtremeWare XOS does not prohibit mixing ACL and routing type entries in a policy file, it is strongly
recommended that you do not mix the entries, and you use separate policy files for ACL and routing policies.
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