AdvancedPublished 2026-07-04
IPv6 Link-Local Addressing
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Lab 8 of 10 in IP Addressing & Subnetting · ← Previous · Next →
CCNA exam domain: Network Fundamentals
Advanced IPv6 interface addressing on Cisco IOS routers. Configure explicit, predictable IPv6 link-local addresses alongside global unicast addresses on a point-to-point router-to-router link. Validate with show commands and neighbor pings using the link-local as the destination, and confirm host-to-gateway reachability on local LANs. No routing protocols or static routes are used; focus is strictly on interface IPv6 addressing mechanics.
Learning objectives
- Explain the purpose and scope of IPv6 link-local addresses (fe80::/10) and why making them explicit can aid operations
- Enable IPv6 forwarding on IOS with ipv6 unicast-routing without deploying any routing protocols
- Configure IPv6 global unicast and explicit link-local addresses on a point-to-point transit
- Verify interface addressing and neighbor reachability using show and ping with an interface to target link-local addresses
- Confirm that hosts can reach their on-link gateway without any inter-subnet routing
Troubleshooting focus
- Pings to fe80:: addresses fail unless the outbound interface is specified
- Mismatched /64 on a point-to-point causes neighbor unreachability
- Forgetting ipv6 unicast-routing prevents forwarding across interfaces (even if this lab does not require inter-subnet traffic, it’s a common operational oversight)
- Duplicate or missing link-local address lines lead to ambiguous or auto-derived values that don’t match the intent
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How this lab is graded
- Build it your way. Where a lab lets you choose a value — a VLAN name, an interface description — grading checks that you configured it, not which name you picked. Names that another line has to reference, like an ACL applied with
access-class, are stated in the guide and do have to match. - Addresses, modes and protocol keywords are exact. An IP address, a subnet mask,
switchport mode trunk, an encapsulation — these carry the meaning of the lab, so they are graded as written in the guide. - Grading reads your saved configuration. Export the lab from CML after you have configured it, and make sure anything you set is in the
running-config— a change that only exists in a terminal session never reaches the grader. - You can submit as many times as you like. Your best score stands, and each attempt tells you which checks passed so you can work the gaps.
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