HPE FlexNetwork 5510 HI Series User Manual

370
Configuring PBR
Overview
Policy-based routing (PBR) uses user-defined policies to route packets. A policy can specify the next
hop for packets that match specific criteria such as ACLs.
The device forwards received packets using the following process:
1. The device uses PBR to forward matching packets.
2. If the packets do not match the PBR policy or the PBR-based forwarding fails, the device uses
the routing table, excluding the default route, to forward the packets.
3. If the routing table-based forwarding fails, the device uses the default route to forward packets.
PBR includes the following types:
• Local PBR—Guides the forwarding of locally generated packets, such as ICMP packets
generated by using the ping command.
• Interface PBR—Guides the forwarding of packets received on an interface.
Policy
A policy includes match criteria and actions to be taken on the matching packets. A policy can have
one or multiple nodes as follows:
• Each node is identified by a node number. A smaller node number has a higher priority.
• A node contains if-match and apply clauses. An if-match clause specifies a match criterion,
and an apply clause specifies an action.
• A node has a match mode of permit or deny.
A policy compares packets with nodes in priority order. If a packet matches the criteria on a node, it is
processed by the action on the node. Otherwise, it goes to the next node for a match. If the packet
does not match the criteria on any node, it is forwarded according to the routing table.
if-match clause
PBR supports the if-match acl clause to set an ACL match criterion. On a node, you can configure
only one if-match clause.
apply clause
PBR supports the apply next-hop clause to set next hops.
Relationship between the match mode and clauses on the node
Does a packet match
all the if-match clauses
on the node?
Match mode
Permit Deny
Yes.
• If the node is configured with
apply clauses, PBR executes the
apply clauses on the node. If the
PBR-based forwarding succeeds,
PBR does not compare the packet
with the next node.
• If the node is configured with no
apply clauses, the packet is
forwarded according to the routing
table.
The packet is forwarded according
to the routing table.

HPE FlexNetwork 5510 HI Series Specifications

General

Brand	HPE
Model	FlexNetwork 5510 HI Series
Category	Switch
Language	English