Contents

Configuring IPv6 static routing· 1

About IPv6 static routing· 1

Configuring an IPv6 static route· 1

Configuring an IPv6 static route with the gateway address as the next hop· 1

Configuring an IPv6 floating static route· 1

Deleting IPv6 static routes· 2

Configuring IPv6 static route FRR· 3

About IPv6 static route FRR· 3

Restrictions and guidelines for IPv6 static route FRR· 3

Configuring IPv6 static route FRR to automatically select a backup next hop· 3

Display and maintenance commands for IPv6 static routing· 4

Configuring an IPv6 default route· 5

Configuring IPv6 static routing

About IPv6 static routing

Static routes are manually configured and cannot adapt to network topology changes. If a fault or a topological change occurs in the network, the network administrator must modify the static routes manually. IPv6 static routing works well in a simple IPv6 network.

Configuring an IPv6 static route

1.     ‍Enter system view.

system-view

2.     Configure an IPv6 static route.

ipv6 route-static ipv6-address prefix-length { interface-type interface-number [ next-hop-address ] | next-hop-address } [ permanent ] [ preference preference ] [ tag tag-value ] [ description text ]

By default, no IPv6 static route is configured.

3.     (Optional.) Set the default preference for IPv6 static routes.

ipv6 route-static default-preference default-preference

The default setting is 60.

Configuring an IPv6 static route with the gateway address as the next hop

About this task

An interface can obtain the gateway address during IPv6 address autoconfiguration. You can configure this feature for an IPv6 static route to use the gateway address as the next hop. When the gateway address changes, the device automatically updates the next hop IPv6 address of the IPv6 static route accordingly. For more information about IPv6 address autoconfiguration, see IPv6 basics and DHCPv6 in Network Connectivity Configuration Guide.

Restrictions and guidelines

If the specified interface has not obtained the gateway address, the IPv6 static route with the gateway address as the next hop address does not take effect.

Procedure

ipv6 route-static ipv6-address prefix-length interface-type interface-number gateway [ preference preference ] [ tag tag-value ] [ description text ]

Configuring an IPv6 floating static route

About this task

Perform this task to implement route backup and improve network reliability.

When an IPv6 static or dynamic route to a destination address already exists on the device, you configure another IPv6 static route with a lower priority as the backup route to improve the network reliability. This backup IPv6 static route is called an IPv6 floating static route, and it is activated only when the primary route fails. After the primary route recovers from failure, the IPv6 floating static route becomes inactive, and data forwarding switches back to the primary route.

As shown in Figure 1, two links exist between Device A and Device B. On device A, configure a static route with next hop Device C and preference 60, and configure a static route with next hop Device D and preference 100. The static route with next hop Device D automatically becomes a floating static route.

Figure 1 Configuring a floating static route

Procedure

You can configure an IPv6 floating static route in either of the following ways

·     Configure different priorities for multiple IPv6 static routes to the same destination address. The route with lower priority automatically becomes the IPv6 floating static route.

·     When an IPv6 route to a destination address already exists on the device, configure an IPv6 static route with a lower priority to the same destination address.

When you configure an IPv6 floating static route, the priority value of the route must be larger than then priority value of the primary route. For more information, see "Configuring an IPv6 static route."

Deleting IPv6 static routes

About this task

To delete an IPv6 static route, use the undo ipv6 route-static command. To delete all IPv6 static routes including the default route, use the delete ipv6 static-routes all command.

Procedure

1.     Enter system view.

system-view

2.     Delete all IPv6 static routes, including the default route.

delete ipv6 static-routes all

Configuring IPv6 static route FRR

About IPv6 static route FRR

A link or router failure on a path can cause packet loss. IPv6 static route fast reroute (FRR) enables fast rerouting to minimize the impact of link or node failures.

Figure 2 Network diagram

As shown in Figure 2, upon a link failure, packets are directed to the backup next hop to avoid traffic interruption. You can enable FRR to automatically select a backup next hop (which must be configured in advance).

Restrictions and guidelines for IPv6 static route FRR

Besides the configured IPv6 static route for FRR, the device must have another route to reach the destination. When the state of the primary link (with Layer 3 interfaces staying up) changes from bidirectional to unidirectional or down, IPv6 static route FRR quickly redirects traffic to the backup next hop. When the Layer 3 interfaces of the primary link are down, IPv6 static route FRR temporarily redirects traffic to the backup next hop. In addition, the device searches for another route to reach the destination and redirects traffic to the new path if a route is found. If no route is found, traffic interruption occurs.

Configuring IPv6 static route FRR to automatically select a backup next hop

About this task

If multiple static routes to the same destination address with different priorities exist on the device, you can use perform this task to enable the device to automatically obtain backup routes. Both the primary and backup routes will be issued to the forwarding table. The route with higher priority is the primary route, and the route with lower priority is the backup route.

Procedure

1.     Enter system view.

system-view

2.     Configure IPv6 static route FRR to automatically select a backup next hop.

ipv6 route-static fast-reroute auto

By default, IPv6 static route FRR is disabled from automatically selecting a backup next hop.

Display and maintenance commands for IPv6 static routing

Execute display commands in any view.

For more information about the display ipv6 routing-table protocol static [ inactive | verbose ] command, see basic IP routing in Network Connectivity Command Reference.

Configuring an IPv6 default route

A default IPv6 route is used to forward packets that match no entry in the routing table.

To configure an IPv6 default route, configure an IPv6 static route with a destination prefix of ::/0. For more information, see "Configuring IPv6 static routing."

As shown in Figure 3, Device B is the next hop for packets from Device A to Device C, Device D, and Device E. You can configure a default route on Device A to replace the three IPv6 static routes from Device A to Device C, Device D, and Device E.

Configure the IPv6 default route as follows:

·     Configure the next hop address as 1::2.

·     Configure the destination address as ::.

·     Configure the prefix length as 0.

Figure 3 Configuring an IPv6 default route

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