917
Configuring IP Unicast Routing
Configuring Protocol-Independent Features
The number of TCAM entries used by PBR depends on the route map itself, the ACLs used, and the order of the
ACLs and route-map entries.
Policy-based routing based on packet length, IP precedence and TOS, set interface, set default next hop, or set
default interface are not supported. Policy maps with no valid set actions or with set action set to Don’t Fragment
are not supported.
Enabling PBR
By default, PBR is disabled on the switch. To enable PBR, you must create a route map that specifies the match criteria
and the resulting action if all of the match clauses are met. Then, you must enable PBR for that route map on an interface.
All packets arriving on the specified interface matching the match clauses are subject to PBR.
PBR can be fast-switched or implemented at speeds that do not slow down the switch. Fast-switched PBR supports
most match and set commands. PBR must be enabled before you enable fast-switched PBR. Fast-switched PBR is
disabled by default.
Packets that are generated by the switch, or local packets, are not normally policy-routed. When you globally enable
local PBR on the switch, all packets that originate on the switch are subject to local PBR. Local PBR is disabled by default.
BEFORE YOU BEGIN
See PBR Configuration Guidelines, page 916.
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