Configuring Policy-Based Routing; About Policy-Based Routing; Purpose; Commands - Enterasys Matrix DFE-Gold Series Configuration Manual

Configuring Policy-Based Routing

Configuring Policy-Based Routing

About Policy-Based Routing

Normally, IP packets are forwarded according to the route that has been selected by traditional
routing protocols, such as RIP and OSPF, or by static routes. In this case, selection is performed
based only on the destination of the IP packet. Policy‐based routing adds more flexibility to
routing by specifying other alternative paths. When a route map list is configured and applied to
an interface, policy‐based routing will check an incoming IP packet against the access list (ACL) of
each map of that list in sequence. If no ACL permit rule matches the packet, the packet is
forwarded on the normal routing path using a route lookup. If a permit rule does match, the ACL
check is exited and the map having the ACL matching the packet is checked for further routing
instruction. If the action of that map is permit, and a next hop is specified, policy‐based routing
will forward the packet to the next hop specified in that map. Otherwise it will forward the packet
on the normal routing path using a route lookup. One route map list is allowed per routing
interface.

Purpose

To review and configure route maps and policy‐based routing.

Commands

For information about...

show route-map

route-map
match ip address
set next hop
show ip policy
ip policy route-map
ip policy priority
ip policy load-policy
ip policy pinger
show route-map
Use this command to display a configured route map list for policy‐based routing.
Syntax
show route-map id-number
8-42 Policy Classification Configuration
Router: These commands can be executed when the device is in router mode only. For details on
how to enable router configuration modes, refer to
page 2-103.
"Enabling Router Configuration
Refer to page...
show route-map
Modes" on
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