Configuring Ipv6 Pbr; Introduction To Ipv6 Pbr; Policy - HP 6125XLG Configuration Manual

Configuring IPv6 PBR

Introduction to IPv6 PBR

Policy-based routing (PBR) uses user-defined policies to route packets. A policy can specify the next hop
and other parameters for packets that match specific criteria such as ACLs.
A device uses PBR to forward matching packets and uses the routing table to forward non-matching
packets. If PBR is not configured, the device uses the routing table to forward packets.
The device supports only interface PBR, which guides the forwarding of packets received on an interface
only.

Policy

An IPv6 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 comprises 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.
•
An IPv6 policy matches nodes in priority order against packets. If a packet satisfies the match 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
IPv6 PBR supports only the if-match acl clause, which sets an ACL match criterion.
You can specify only one if-match clause of each type for a node.
apply clause
IPv6 PBR supports only the apply next-hop clause, which sets the next hop for packets.
Relationship between the match mode and clauses on the node
Does a packet match all the
if-match clauses on the
node?
Yes
No
In permit mode
•
If the node is configured with an
apply clause, IPv6 PBR executes
the apply clause on the node.
•
If the node is configured with no
apply clause, the packet is
forwarded according to the
routing table.
IPv6 PBR matches the packet against
the next node.
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Match mode
In deny mode
The packet is forwarded according
to the routing table.
IPv6 PBR matches the packet against
the next node.