An IPv6 static route is a manually configured instruction that tells a router how to reach a remote destination network. Connected and local routes cover directly attached networks, but remote destinations require static routing or dynamic routing. Static routes provide predictable forwarding and precise path control, although manual configuration becomes difficult as networks grow. section 21.3 section 17.1.2
Figure 21.7 An IPv6 network consisting of three routers. Which static routes must be configured to enable communication between PC1 and PC3?
Use the three-router IPv6 topology to identify which routes are missing before configuring them. section 21.3
Plan static routes by matching each router’s needs to the communicating endpoint networks:
- For communication between PC1 and PC3, R1 needs a route to 2001:db8:3::/64 through 2001:db8:12::2. section 21.3
- R2 needs routes to 2001:db8:1::/64 through 2001:db8:12::1 and 2001:db8:3::/64 through 2001:db8:23::2. section 21.3
- R3 needs a route to 2001:db8:1::/64 through 2001:db8:23::1. section 21.3
- Configure routes to the communicating hosts’ networks rather than every network along the path; each router forwards traffic to its next hop. section 9.3 section 21.3
Primary and backup IPv6 default routes
A default route uses ::/0 and matches every IPv6 destination not matched by a more specific route. R1 can use ISP-A as its primary path with `ipv6 route ::/0 2001:db8::2`. Adding `ipv6 route ::/0 2001:db8:1::2 2` creates a floating static route: because the administrative distance is higher than the default value of 1, it remains unused until the primary route disappears. Shutting down R1’s primary interface causes the backup route to enter the routing table. section 21.3.4 section 9.3.2
Verify IPv6 static routes in the routing table and confirm that the intended next hop is installed. Static routes are a CCNA exam topic, while IPv6 dynamic routing is outside the stated exam coverage. section 21.0 section 21.3.4
