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Which configuration feature should be used to block rogue router advertisements instead of using the IPv6 Router Advertisement Guard feature?

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(@goyrocky)
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Which configuration feature should be used to block rogue router advertisements instead of using the IPv6 Router Advertisement Guard feature?

  • A . VACL blocking broadcast frames from nonauthorized hosts
  • B . PVLANs with promiscuous ports associated to route advertisements and isolated ports for nodes
  • C . PVLANs with community ports associated to route advertisements and isolated ports for nodes
  • D . IPv4 ACL blocking route advertisements from nonauthorized hosts

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Suggested Answer: B

Explanation:

The IPv6 Router Advertisement Guard feature provides support for allowing the network administrator to block or reject unwanted or rogue router advertisement guard messages that arrive at the network device platform. Router Advertisements are used by devices to announce themselves on the link. The IPv6 Router Advertisement Guard feature analyzes these router advertisements and filters out router advertisements that are sent by unauthorized devices. Certain switch platforms can already implement some level of rogue RA filtering by the administrator configuring Access Control Lists (ACLs) that block RA ICMP messages that might be inbound on “user” ports.

Reference: https://datatracker.ietf.org/doc/html/rfc6104

   
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