IP Router alert option in IGMP messages

Princy Elizabeth <[email protected]>
Newsgroups gmane.ietf.magma
Message-ID <[email protected]>
Hi all,
   
  I had a query on the usage of the IP Router alert option in IGMP messages. I do not understand what exactly is the significance of this option. What does a non-multicast enabled router do on receiving an IGMP 'Join' or a 'Query' with the IP Router alert option set? Does a multicast enabled router actually require this option for recognising IGMP packets in its fast path? Don't most routers look at the IGMP protocol field for identifying IGMP packets?
   
  Thanks and regards,
  Princy

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