IPv6 policy-based routing (PBR) uses user-defined policies to route IPv6 packets. You can define PBR policies for the system to take specified actions on the packets that match the specified criteria such as an ACL or a packet length. For example, you can set the next hop, output interface, default next hop, and default output interface.

IPv6 packet forwarding process

When the device receives an IPv6 packet, the device searches the IPv6 PBR policy for a matching node to forward that packet.

· If a matching node is found and its match mode is permit, the device performs the following operations:

a. Uses the next hops or output interfaces specified on the node to forward the packet.

b. Searches the routing table for a route (except the default route) to forward the packet if one of the following conditions exists:

- No next hops or output interfaces are specified on the node.

- Forwarding failed based on the next hops or output interfaces.

c. Uses the default next hops or default output interfaces specified on the node to forward the packet if one of the following conditions exists:

- No matching route was found in the routing table.

- The routing table-based forwarding failed.

d. Uses the default route to forward the packet if one of the following conditions exists:

- No default next hops or default output interfaces are specified on the node.

- The forwarding failed based on the default next hops or default output interfaces.

· The device performs routing table lookup to forward the packet in either of the following conditions:

¡ No matching node is found.

¡ A matching node is found, but its match mode is deny.

IPv6 PBR types

IPv6 PBR includes the following types:

· Local PBR—Guides the forwarding of locally generated packets, such as the ICMP packets generated by using the ping command.

· Interface PBR—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 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.

An IPv6 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, the device performs a routing table lookup for the packet.

Relationship between if-match clauses

On a node, you can specify multiple if-match clauses, but only one if-match clause for each type. A packet that matches all the if-match clauses of a node matches the node.

Relationship between apply clauses

You can specify multiple apply clauses for a node, but some of them might not be executed. For more information about the relationship between the apply clauses, see "Configuring actions for an IPv6 node."

Relationship between the match mode and clauses on the node

Does a packet match all the if-match clauses on the node?	Match mode
Does a packet match all the if-match clauses on the node?	In permit mode	In deny mode
Yes	· If the node contains apply clauses, IPv6 PBR executes the apply clauses on the node. ¡ If IPv6 PBR-based forwarding succeeds, IPv6 PBR does not compare the packet with the next node. ¡ If IPv6 PBR-based forwarding fails and the apply continue clause is not configured, IPv6 PBR does not compare the packet with the next node. ¡ If IPv6 PBR-based forwarding fails and the apply continue clause is configured, IPv6 PBR compares the packet with the next node. · If the node does not contain apply clauses, the device performs a routing table lookup for the packet.	The device performs a routing table lookup for the packet.
No	IPv6 PBR compares the packet with the next node.	IPv6 PBR compares the packet with the next node.

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NOTE:

A node that has no if-match clauses matches any packet.

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IPv6 PBR and Track

IPv6 PBR can work with the Track feature to dynamically adapt the availability status of an apply clause to the link status of a tracked object. The tracked object can be a next hop, output interface, default next hop, or default output interface.

· When the track entry associated with an object changes to Negative, the apply clause is invalid.

· When the track entry changes to Positive or NotReady, the apply clause is valid.

For more information about Track-IPv6 PBR collaboration, see High Availability Configuration Guide.

Restrictions and guidelines: IPv6 PBR configuration

If the device performs forwarding in software, IPv6 PBR does not process IP packets destined for the local device.

If the device performs forwarding in hardware and a packet destined for it matches an IPv6 PBR policy, IPv6 PBR will execute the apply clauses in the policy, including the clause for forwarding. When you configure an IPv6 PBR policy, be careful to avoid this situation.

IPv6 PBR tasks at a glance

To configure IPv6 PBR, perform the following tasks:

1. Configuring an IPv6 policy

a. Creating an IPv6 node

b. Setting match criteria for an IPv6 node

c. Configuring actions for an IPv6 node

2. Specifying a policy for IPv6 PBR

Choose the following tasks as needed:

¡ Specifying an IPv6 policy for IPv6 local PBR

¡ Specifying an IPv6 policy for IPv6 interface PBR

¡ Specifying an IPv6 policy for IPv6 global PBR

Configuring an IPv6 policy

Creating an IPv6 node

1. Enter system view.

system-view

2. Create an IPv6 policy or policy node and enter its view.

ipv6 policy-based-route policy-name [ deny | permit ] node node-number

3. (Optional.) Configure a description for the IPv6 policy node.

description text

By default, no description is configured for an IPv6 policy node.

Setting match criteria for an IPv6 node

1. Enter system view.

system-view

2. Enter IPv6 policy node view.

ipv6 policy-based-route policy-name [ deny | permit ] node node-number

3. Set match criteria.

¡ Set an ACL match criterion.

if-match acl { ipv6-acl-number | name ipv6-acl-name }

By default, no ACL match criterion is set.

The ACL match criterion cannot match Layer 2 information.

¡ Set a packet length match criterion.

if-match packet-length min-len max-len

By default, no packet length match criterion is set.

¡ Set a source IPv6 address match criterion.

if-match source-ipv6 { interface interface-type interface-number | [ vpn-instance vpn-instance-name ] ipv6-address }

By default, no source IPv6 address match criterion is set.

Configuring actions for an IPv6 node

About this task

The apply clauses allow you to specify actions to take on matching packets on a node.

The following apply clauses are traffic path steering clauses, which determine the packet forwarding paths in a descending order:

· apply access-vpn

· apply next-hop

· apply output-interface

· apply default-next-hop

· apply default-output-interface

IPv6 PBR supports the apply clauses in Table 1.

Table 1 Apply clauses supported in IPv6 PBR

Clause	Meaning	Remarks
apply precedence	Sets an IP precedence.	This clause is always executed.
apply loadshare { default-next-hop \| default-output-interface \| next-hop \| output-interface }	Enables load sharing among multiple next hops, output interfaces, default next hops, or default output interfaces.	Multiple next hop, output interface, default next hop, or default output interface options operate in either primary/backup or load sharing mode. The following information uses multiple next hops for example to describe the mechanisms of these two modes: · Primary/backup mode—A next hop is selected from all next hops in configuration order for packet forwarding, with all remaining next hops as backups. When the selected next hop fails, the next available next hop takes over. · Load sharing mode—Matching traffic is distributed across the available next hops. If the traffic does not match any fast forwarding entries, per-packet load sharing is performed. If the traffic matches a fast forwarding entry, per-flow load sharing is performed. By default, the primary/backup mode applies. For the load sharing mode to take effect, make sure multiple next hops, output interfaces, default next hops, or default output interfaces are set in the policy.
apply access-vpn	Specifies the forwarding tables that can be used for the matching packets.	Use this clause only in special scenarios that require sending packets received from one network to another network, for example, from a VPN to the public network, or from one VPN to another VPN. The device forwards the matching packets by using the first available forwarding table selected in the order in which they are specified.
apply remark-vpn	Enables VPN remark action.	VPN remark action marks the matching packets as belonging to the VPN instance to which they are forwarded based on the apply access-vpn vpn-instance command. All subsequent service modules of IPv6 PBR handle the packets as belonging to the re-marked VPN instance. If the VPN remark action is not enabled, the forwarded matching packets are marked as belonging to the VPN instance or the public network from which they were received. VPN remark action applies only to packets that have been successfully forwarded based on the apply access-vpn vpn-instance command.
apply next-hop and apply output-interface	Sets next hops and output interfaces.	If multiple clauses are configured, only the clause with the highest priority is executed.
apply default-next-hop and apply default-output-interface	Sets default next hops and default output interfaces.	If multiple clauses are configured, only the clause with the highest priority is executed. The clauses take effect only in the following cases: · No next hops or output interfaces are set or the next hops and output interfaces are invalid. · The IPv6 packet does not match any route in the routing table.
apply continue	Compares packets with the next node upon failure on the current node.	The apply continue clause applies when either of the the following conditions exist: · None of the traffic path steering clauses is configured. · Traffic path steering clauses (if any) on the node are all invalid and a subsequent routing table lookup also fails for the matching packet. NOTE: A clause might become invalid because the specified next hop is unreachable, packets cannot be forwarded in the specified VPN instance, the specified SRv6 TE policy is invalid, or the specified output interface is down.

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Restrictions and guidelines for action configuration

IPv6 PBR periodically performs a lookup in the FIB table to determine the availability of a next hop or default next hop specified in an IPv6 PBR policy. If a route change occurs to the next hop, IPv6 PBR might not update the route immediately. This results in a temporary communication interruption.

IPv6 PBR can guide packets that match a service chain only to VXLAN tunnels in IPv4 networks.

Setting an IP preference

1. Enter system view.

system-view

2. Enter IPv6 policy node view.

ipv6 policy-based-route policy-name [ deny | permit ] node node-number

3. Set an IP precedence.

apply precedence { type | value }

By default, no IP precedence is specified.

Configuring actions for a node

1. Enter system view.

system-view

2. Enter IPv6 policy node view.

ipv6 policy-based-route policy-name [ deny | permit ] node node-number

3. Configure actions for a node.

¡ Specify the forwarding tables that can be used for the matching packets.

apply access-vpn { public | vpn-instance vpn-instance-name&<1-4> }

By default, the device forwards matching packets by using the forwarding table for the network from which the packets are received.

You can repeat this command to specify the forwarding tables for the public network and VPN instances. The device forwards the matching packets by using the first available forwarding table selected in the order in which they are specified.

¡ Enable VPN remark action to mark the matching packets as belonging to the VPN instance to which they are forwarded based on the apply access-vpn vpn-instance command.

apply remark-vpn

By default, VPN remark action is not configured.

¡ Set next hops for permitted IPv6 packets.

apply next-hop [ vpn-instance vpn-instance-name | inbound-vpn ] { ipv6-address [ direct ] [ track track-entry-number ] [ weight weight-value ] } &<1-4>

By default, no next hops are specified.

You can specify multiple next hops for backup or load sharing in one command line or by executing this command multiple times. You can specify a maximum of four next hops for a node.

If multiple next hops on the same subnet are specified for backup, the device first uses the subnet route for the next hops to forward packets when the primary next hop fails. If the subnet route is not available, the device selects a backup next hop.

¡ Enable load sharing among multiple next hops.

apply loadshare next-hop

By default, the next hops operate in primary/backup mode.

¡ Set output interfaces.

apply output-interface { interface-type interface-number [ track track-entry-number ] }&<1-4>

By default, no output interfaces are specified.

You can specify multiple output interfaces for backup or load sharing in one command line or by executing this command multiple times. You can specify a maximum of four output interfaces for a node.

¡ Enable load sharing among multiple output interfaces.

apply loadshare output-interface

By default, the output interfaces operate in primary/backup mode.

¡ Set default next hops.

apply default-next-hop [ vpn-instance vpn-instance-name | inbound-vpn ] { ipv6-address [ direct ] [ track track-entry-number ] } &<1-4>

By default, no default next hops are specified.

You can specify multiple default next hops for backup or load sharing in one command line or by executing this command multiple times. You can specify a maximum of four default next hops for a node.

¡ Enable load sharing among multiple default next hops.

apply loadshare default-next-hop

By default, the default next hops operate in primary/backup mode.

¡ Set default output interfaces.

apply default-output-interface { interface-type interface-number [ track track-entry-number ] }&<1-4>

By default, no default output interfaces are specified.

You can specify multiple default output interfaces for backup or load sharing in one command line or by executing this command multiple times. You can specify a maximum of four default output interfaces for a node.

¡ Enable load sharing among multiple default output interfaces.

apply loadshare default-output-interface

By default, the default output interfaces operate in primary/backup mode.

Comparing packets with the next node upon match failure on the current node

1. Enter system view.

system-view

2. Enter IPv6 policy node view.

ipv6 policy-based-route policy-name [ deny | permit ] node node-number

3. Compare packets with the next node upon match failure on the current node.

apply continue

By default, IPv6 PBR does not compare packets with the next node upon match failure on the current node.

This command takes effect only when the match mode of the node is permit.

Specifying a policy for IPv6 PBR

Specifying an IPv6 policy for IPv6 local PBR

About this task

Perform this task to specify an IPv6 policy for IPv6 local PBR to guide the forwarding of locally generated packets.

Restrictions and guidelines

You can specify only one policy for IPv6 local PBR and must make sure the specified policy already exists. Before you apply a new policy, you must first remove the current policy.

IPv6 local PBR might affect local services, such as ping and Telnet. When you use IPv6 local PBR, make sure you fully understand its impact on local services of the device.

Procedure

1. Enter system view.

system-view

2. Specify an IPv6 policy for IPv6 local PBR.

ipv6 local policy-based-route policy-name

By default, IPv6 local PBR is not enabled.

Specifying an IPv6 policy for IPv6 interface PBR

About this task

Perform this task to apply an IPv6 policy to an interface to guide the forwarding of packets received on the interface only.

To apply an IPv6 policy to multiple VLAN interfaces at the same time, you can use the ipv6 policy-based-route apply command. Using this command simplifies configuration and saves device resources.

Restrictions and guidelines

You can apply only one policy to an interface and must make sure the specified policy already exists. Before you apply a new policy, you must first remove the current policy from the interface.

You can apply a policy to multiple interfaces.

Procedure

1. Enter system view.

system-view

2. Enter interface view.

interface interface-type interface-number

3. Specify an IPv6 policy for IPv6 interface PBR.

ipv6 policy-based-route policy-name

By default, no IPv6 policy is applied to the interface.

Specifying an IPv6 policy for IPv6 global PBR

About this task

Perform this task to apply an IPv6 policy to all interfaces on the device to guide the forwarding of packets received on the interfaces.

Restrictions and guidelines

You can apply only one IPv6 policy for IPv6 global PBR and the specified IPv6 policy must already exist. Before you can apply a new IPv6 policy, you must first remove the current IPv6 policy.

IPv6 interface PBR takes precedence over IPv6 global PBR on an interface. When they are both configured and packets fail to match the IPv6 interface PBR policy, IPv6 global PBR applies.

Procedure

1. Enter system view.

system-view

2. Specify an IPv6 policy for IPv6 global PBR.

ipv6 global policy-based-route policy-name

By default, no IPv6 policy is specified for IPv6 global PBR.

Verifying and maintaining IPv6 PBR

Verifying IPv6 PBR policy configuration

To display IPv6 PBR policy information, execute the following command in any view:

display ipv6 policy-based-route [ policy policy-name ]

Displaying IPv6 PBR configuration and statistics

Perform display tasks in any view.

· Display IPv6 PBR configuration.

display ipv6 policy-based-route setup

· Display IPv6 local PBR configuration and statistics.

display ipv6 policy-based-route local [ slot slot-number ]

· Display IPv6 global PBR configuration and statistics.

display ipv6 policy-based-route global [ slot slot-number ]

· Display IPv6 interface PBR configuration and statistics.

display ipv6 policy-based-route interface interface-type interface-number [ slot slot-number ]

Clearing IPv6 PBR statistics

To clear IPv6 PBR statistics, execute the following command in user view:

reset ipv6 policy-based-route statistics [ policy policy-name ]

IPv6 PBR configuration examples

Example: Configuring packet type-based IPv6 local PBR

Network configuration

As shown in Figure 1, Router B and Router C are connected through Router A. Router B and Router C do not have a route to reach each other.

Configure IPv6 PBR on Router A to forward all TCP packets to the next hop 1::2 (Router B).

Figure 1 Network diagram

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Procedure

1. Configure Router A:

# Configure the IPv6 addresses of GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2.

<RouterA> system-view

[RouterA] interface gigabitethernet 1/0/1

[RouterA-GigabitEthernet1/0/1] ipv6 address 1::1 64

[RouterA-GigabitEthernet1/0/1] quit

[RouterA] interface gigabitethernet 1/0/2

[RouterA-GigabitEthernet1/0/2] ipv6 address 2::1 64

[RouterA-GigabitEthernet1/0/2] quit

# Configure ACL 3001 to match TCP packets.

[RouterA] acl ipv6 advanced 3001

[RouterA-acl-ipv6-adv-3001] rule permit tcp

[RouterA-acl-ipv6-adv-3001] quit

# Configure Node 5 for policy aaa to forward TCP packets to next hop 1::2.

[RouterA] ipv6 policy-based-route aaa permit node 5

[RouterA-pbr6-aaa-5] if-match acl 3001

[RouterA-pbr6-aaa-5] apply next-hop 1::2

[RouterA-pbr6-aaa-5] quit

# Configure IPv6 local PBR by applying policy aaa to Router A.

[RouterA] ipv6 local policy-based-route aaa

2. On Router B, configure the IPv6 address of GigabitEthernet 1/0/1.

<RouterB> system-view

[RouterB] interface gigabitethernet 1/0/1

[RouterB-GigabitEthernet1/0/1] ipv6 address 1::2 64

3. On Router C, configure the IPv6 address of GigabitEthernet 1/0/2.

<RouterC> system-view

[RouterC] interface gigabitethernet 1/0/2

[RouterC-GigabitEthernet1/0/2] ipv6 address 2::2 64

Verifying the configuration

1. Perform telnet operations to verify that IPv6 local PBR on Router A operates as configured to forward the matching TCP packets to the next hop 1::2 (Router B), as follows:

# Verify that you can telnet to Router B from Router A successfully. (Details not shown.)

# Verify that you cannot telnet to Router C from Router A. (Details not shown.)

2. Verify that Router A forwards packets other than TCP packets through GigabitEthernet 1/0/2. For example, verify that you can ping Router C from Router A. (Details not shown.)

Example: Configuring packet type-based IPv6 interface PBR

Network configuration

As shown in Figure 2, Router B and Router C do not have a route to reach each other.

Configure IPv6 PBR on Router A to forward all TCP packets received on GigabitEthernet 1/0/1 to the next hop 1::2 (Router B).

Figure 2 Network diagram

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Procedure

1. Configure IPv6 addresses and unicast routing protocol settings to make sure Router B and Router C can reach Host A. (Details not shown.)

2. Configure Router A:

# Configure ACL 3001 to match TCP packets.

[RouterA] acl ipv6 advanced 3001

[RouterA-acl-ipv6-adv-3001] rule permit tcp

[RouterA-acl-ipv6-adv-3001] quit

# Configure Node 5 for policy aaa to forward TCP packets to next hop 1::2.

[RouterA] ipv6 policy-based-route aaa permit node 5

[RouterA-pbr6-aaa-5] if-match acl 3001

[RouterA-pbr6-aaa-5] apply next-hop 1::2

[RouterA-pbr6-aaa-5] quit

# Configure IPv6 interface PBR by applying policy aaa to GigabitEthernet 1/0/1.

[RouterA] interface gigabitethernet 1/0/1

[RouterA-GigabitEthernet1/0/1] undo ipv6 nd ra halt

[RouterA-GigabitEthernet1/0/1] ipv6 policy-based-route aaa

[RouterA-GigabitEthernet1/0/1] quit

Verifying the configuration

1. Enable IPv6 and configure the IPv6 address 10::3 for Host A.

C:\>ipv6 install

Installing...

Succeeded.

C:\>ipv6 adu 4/10::3

2. Perform telnet operations to verify that IPv6 interface PBR on Router A operates as configured to forward the matching TCP packets to the next hop 1::2 (Router B), as follows:

# Verify that you can telnet to Router B from Host A successfully. (Details not shown.)

# Verify that you cannot telnet to Router C from Host A. (Details not shown.)

3. Verify that Router A forwards packets other than TCP packets through GigabitEthernet 1/0/3. For example, verify that you can ping Router C from Host A. (Details not shown.)

Example: Configuring packet length-based IPv6 interface PBR

Network configuration

As shown in Figure 3, configure IPv6 interface PBR to guide the forwarding of packets received on GigabitEthernet 1/0/1 of Router A as follows:

· Set the next hop of packets with a length of 64 to 100 bytes to 150::2/64.

· Set the next hop of packets with a length of 101 to 1000 bytes to 151::2/64.

Figure 3 Network diagram

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Procedure

1. Configure IPv6 addresses and unicast routing protocol settings to make sure the devices each have a route to reach one another. (Details not shown.)

2. Configure Router A:

# Configure Node 10 for policy lab1 to forward packets with a length of 64 to 100 bytes to the next hop 150::2/64.

[RouterA] ipv6 policy-based-route lab1 permit node 10

[RouterA-pbr6-lab1-10] if-match packet-length 64 100

[RouterA-pbr6-lab1-10] apply next-hop 150::2

[RouterA-pbr6-lab1-10] quit

# Configure Node 20 for policy lab1 to forward packets with a length of 101 to 1000 bytes to the next hop 151::2/64.

[RouterA] ipv6 policy-based-route lab1 permit node 20

[RouterA-pbr6-lab1-20] if-match packet-length 101 1000

[RouterA-pbr6-lab1-20] apply next-hop 151::2

[RouterA-pbr6-lab1-20] quit

# Configure IPv6 interface PBR by applying policy lab1 to GigabitEthernet 1/0/1.

[RouterA] interface gigabitethernet 1/0/1

[RouterA-GigabitEthernet1/0/1] undo ipv6 nd ra halt

[RouterA-GigabitEthernet1/0/1] ipv6 policy-based-route lab1

[RouterA-GigabitEthernet1/0/1] return

Verifying the configuration

# Execute the debugging ipv6 policy-based-route command on Router A.

<RouterA> debugging ipv6 policy-based-route

<RouterA> terminal logging level 7

<RouterA> terminal monitor

# Install IPv6 protocol suites on Host A, and configure the IPv6 address 192::3.

C:\>ipv6 install

Installing...

Succeeded.

C:\>ipv6 adu 4/192::3

# Ping Loopback 0 of Router B from Host A, and set the data length to 64 bytes.

C:\>ping –n 1 -l 64 10::1

Pinging 10::1 with 64 bytes of data:

Reply from 10::1: time=1ms

Ping statistics for 10::1:

Packets: Sent = 1, Received = 1, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 1ms, Maximum = 1ms, Average = 1ms

The debugging information about IPv6 PBR displayed on Router A is as follows:

*Jun 26 13:04:33:519 2012 RouterA PBR6/7/PBR Forward Info: -MDC=1; Policy:lab1, Node:

10,match succeeded.

*Jun 26 13:04:33:519 2012 RouterA PBR6/7/PBR Forward Info: -MDC=1; apply next-hop 150

::2.

The output shows that Router A sets the next hop for the received packets to 150::2 according to IPv6 PBR. The packets are forwarded through GigabitEthernet 1/0/2.

# Ping Loopback 0 of Router B from Host A, and set the data length to 200 bytes.

C:\>ping –n 1 -l 200 10::1

Pinging 10::1 with 200 bytes of data:

Reply from 10::1: time=1ms

Ping statistics for 10::1:

Packets: Sent = 1, Received = 1, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 1ms, Maximum = 1ms, Average = 1ms

The debugging information about IPv6 PBR displayed on Router A is as follows:

*Jun 26 13:20:33:619 2012 RouterA PBR6/7/PBR Forward Info: -MDC=1; Policy:lab1, Node:

20,match succeeded.

*Jun 26 13:20:33:619 2012 RouterA PBR6/7/PBR Forward Info: -MDC=1; apply next-hop 151

::2.

The output shows that Router A sets the next hop for the received packets to 151::2 according to IPv6 PBR. The packets are forwarded through GigabitEthernet 1/0/3.

07-Layer 3—IP Routing Configuration Guide

Configuring IPv6 PBR

Relationship between if-match clauses

Relationship between apply clauses

Relationship between the match mode and clauses on the node

IPv6 PBR tasks at a glance

Configuring an IPv6 policy

About this task

Restrictions and guidelines for action configuration

Setting an IP preference

Configuring actions for a node

Comparing packets with the next node upon match failure on the current node

About this task

Restrictions and guidelines

Procedure

About this task

Restrictions and guidelines

Procedure

About this task

Restrictions and guidelines

Procedure

Network configuration

Procedure

Verifying the configuration

Network configuration

Procedure

Verifying the configuration

Example: Configuring packet length-based IPv6 interface PBR

Network configuration

Procedure

Verifying the configuration

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