Which two tunneling techniques support IPv6 multicasting? (Choose two.)

Question

Options

• A6to4
• B6over4
• CISATAP
• D6PE
• EGRE

• A
  10% (6)
• B
  80% (48)
• C
  3% (2)
• D
  7% (4)

Explanation

When IPv6 multicast is supported (over a 6to4 tunnel), an IPv6 multicast routing protocol must be Restrictions for Implementing IPv6 Multicast IPv6 multicast for Cisco IOS software uses MLD version 2. This version of MLD is fully backward- compatible with MLD version 1 (described in RFC 2710). Hosts that support only MLD version 1 will interoperate with a router running MLD version 2. Mixed LANs with both MLD version 1 and MLD version 2 hosts are likewise supported. IPv6 multicast is supported only over IPv4 tunnels in Cisco IOS Release 12.3(2)T, Cisco IOS (18)S, and Cisco IOS Release 12.0(26)S. When the bidirectional (bidir) range is used in a network, all routers in that network must be able to understand the bidirectional range in the bootstrap message (BSM). IPv6 multicast routing is disabled by default when the ipv6 unicast-routing command is configured. On Cisco Catalyst 6500 and Cisco 7600 series routers, the ipv6 multicast-routing also must be enabled in order to use IPv6 unicast routing about_cisco_ipj_archive_article09186a00800c830a.html https://supportforums.cisco.com/thread/183386

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