
Configuring Traffic Filters and Protocol Prioritization
3-10 117348-A Rev. A
When specifying the user-defined criterion length, use 8 bits whenever possible.
IP inbound traffic filters with a length of 1 bit work only when aligned on a byte
(word) boundary. Lengths from 2 to 7 bits do not work.
IP Actions
In addition to the Accept, Drop, and Log actions common to all inbound traffic
filters, there are the following IP actions:
• Forward to Next Hop
Specifies that any frame that matches the filter will be forwarded to the
next-hop router. You must specify the IP address of the next-hop router. If the
next-hop router is not reachable, any packets matching the filter will be
forwarded normally unless you also specify Drop If Next Hop Is Unreachable.
If you specify 255.255.255.255 as the next hop, any frame that matches this
filter will be forwarded normally.
• Drop If Next Hop Is Unreachable
This action is valid only when Forward to Next Hop is in use. It specifies that
if the next-hop address specified is unreachable, the frame is dropped.
• Forward to IP Address
Specifies that any frame that matches the filter will be forwarded to a single
address in a list of specified IP addresses. The destination address of the
original packet changes to the specified IP address.
• Forward to Next Hop Interfaces
Specifies that any frame that matches the filter will be duplicated and
forwarded to a group of next-hop IP addresses that you specify. If none of the
next-hop interfaces is active, the router forwards packets that match the filter
to the packet destination address (unless you also specify Drop If Next Hop Is
Unreachable).
• Forward to First Up Next Hop Interface
Specifies that any frame that matches the filter will be forwarded to a specified
next-hop router or to a network connected to the router. If the specified hop is
not reachable, the filter tries all addresses on the next-hop interfaces list using
ARP messages. If none of the next-hop interfaces is reachable, the router
forwards packets that match the filter to the packet destination address (unless
you also specify Drop If Next Hop Is Unreachable).
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