CCIE RS – Written – L2 Multicast – Explain MLD

Multicast Listener Discovery Protocol

 

  • ICMP is used to carry messages
  • Messages are link local with hop limit of 1
  • Used by IPv6 to discover multicast listeners on directly attached links
  • PIM-SM is used between deices to track multicast packets to forward to each other
  • PIM-SSM – Ability to report interest in receiving packets from SSM to an IP multicast address
  • Message Types
    • Query – General, group specific and multicast address specific
      • Multicast address field is set to 0 when MLD sends a general query
    • Report – Multicast address field is that of the specific IPv6 multicast address to which the sender is listening
      • Must be sent with a valid IPv6 link local source address or the unspecified (::)
      • Unspecified address (::) is the allow support of Neighbor Discovery Protocol
    • Done – Multicast address field is that of the specific IPv6 multicast address to which the source of the MLD message is no longer listening
  • MLDv1
    • Based on IGMPv2
  • MLDv2
    • Based on IGMPv3
    • Backwards compatible with MLDv1

IPv6 Multicast

  • Ipv6 mutlicast-routing

Configuration

  • ipv6 mld join-group [group-address] [[include | exclude] {source-address | source-list [acl]} 
  • ipv6 mld access-group access-list-name 
  • ipv6 mld static-group [group-address] [[include| exclude] {source-address | source-list [acl]} 
  • ipv6 mld query-max-response-time seconds 
  • ipv6 mld query-timeout seconds 
  • ipv6 mld query-interval seconds 

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_lsm/configuration/xe-3s/imc-lsm-xe-3s-book/ipv6-mcast-mld-xe.html

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.