CCNP R&S Question of the Week: IPv6 Traffic Filter Impact

For security reasons, an IPv6 traffic filter has been applied under multiple interfaces on the local router. However, shortly after the traffic filter was applied, OSPFv3 neighbor adjacencies go down. What caused this issue?

A. The traffic filter is blocking all ICMPv6 traffic.
B. The global anycast address must be added to the access control list to allow OSPFv3 to function.
C. The link-local addresses were explicitly denied.
D. IPv6 traffic filtering cannot be applied to more than one interface.

Reveal Answer

Answer: C.

OSPFv3 uses link-local IPv6 addresses for neighbor discovery and other features, so if any IPv6 traffic filters are implemented be sure to permit the link local address so that local communication can function.

 

Related Courses
ROUTE – Implementing Cisco IP Routing v2.0
SWITCH – Implementing Cisco IP Switched Networks v2.0
TSHOOT – Troubleshooting and Maintaining Cisco IP Networks v2.0

Related Certification
CCNP Routing and Switching

CCNP R&S Question of the Week Series

• CCNP R&S Question of the Week: IPv6
• CCNP R&S Question of the Week: BGP Attribute
• CCNP R&S Question of the Week: Gateway of Last Resort
• CCNP R&S Question of the Week: Routing Protocols into OSPF
• CCNP R&S Question of the Week: BPDU Guard
• CCNP R&S Question of the Week: Private VLANs
• CCNP R&S Question of the Week: Blocking to Forwarding State
• CCNP R&S Question of the Week: FTP to HTTP
• CCNP R&S Question of the Week: Alerts
• CCNP R&S Question of the Week: Configuration Sequence
• CCNP R&S Question of the Week: TCP Traffic
• CCNP R&S Question of the Week: IPv4 and IPv6
• CCNP R&S Question of the Week: clear ip route
• CCNP R&S Question of the Week: IPv6 Traffic Filter Impact

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