Foundry Networks Switch and Router Installation And Configuration Manual page 1043

Policies and Filters
NOTE: The optional match internal | external1 | external2 argument applies only to OSPF.
IP Switching and IPX Switching Filters
IP and IPX switching filters are the same as router acceleration policies. See "Router Acceleration Policies" on
page C-18.
Layer 4 Filters
Layer 4 filters control IP traffic based on the Layer 3 and Layer 4 information in the packets. On Foundry Layer 2
and Layer 3 Switches, Layer 4 filters are access policies that control access to Layer 4 applications based on
TCP/UDP or other port number.
On the ServerIron, Layer 4 filters are policies that control whether the ServerIron redirects HTTP traffic from web
clients to cache servers or sends the traffic to the Internet.
TCP/UDP Forwarding Filters
TCP/UDP forwarding filters are the same as TCP/UDP access policies. See "TCP/UDP Access Policies" on
page C-20.
Cache Server Redirection Filters
Cache server redirection filters are the same thing as cache server redirection policies. See "Cache Server
Redirection Policies" on page C-22.
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