OSPF and its use of Multicast
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When it comes to OSPF and its use of multicast, am I correct in believing that IGMP forwarding and an IGMP querier is still required within the local segment?
My understanding would be without this, the frames would be treated as a broadcast and sent to everyone. Therefore removing the benefit of using multicast.
Based on this is there any mechanism for it to fall back to unicast, to prevent the above. Apologies if my understanding here is way off : )
ospf multicast igmp
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up vote
3
down vote
favorite
When it comes to OSPF and its use of multicast, am I correct in believing that IGMP forwarding and an IGMP querier is still required within the local segment?
My understanding would be without this, the frames would be treated as a broadcast and sent to everyone. Therefore removing the benefit of using multicast.
Based on this is there any mechanism for it to fall back to unicast, to prevent the above. Apologies if my understanding here is way off : )
ospf multicast igmp
add a comment |Â
up vote
3
down vote
favorite
up vote
3
down vote
favorite
When it comes to OSPF and its use of multicast, am I correct in believing that IGMP forwarding and an IGMP querier is still required within the local segment?
My understanding would be without this, the frames would be treated as a broadcast and sent to everyone. Therefore removing the benefit of using multicast.
Based on this is there any mechanism for it to fall back to unicast, to prevent the above. Apologies if my understanding here is way off : )
ospf multicast igmp
When it comes to OSPF and its use of multicast, am I correct in believing that IGMP forwarding and an IGMP querier is still required within the local segment?
My understanding would be without this, the frames would be treated as a broadcast and sent to everyone. Therefore removing the benefit of using multicast.
Based on this is there any mechanism for it to fall back to unicast, to prevent the above. Apologies if my understanding here is way off : )
ospf multicast igmp
ospf multicast igmp
edited 1 hour ago
Ron Maupinâ¦
59k1058106
59k1058106
asked 1 hour ago
rick3d
836
836
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1 Answer
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The benefit of multicast is that hosts not subscribing to the multicast group ignore frames they receive that are sent to the multicast group. With broadcast, they cannot ignore the frames.
The OSPF multicast group is a link-local multicast that gets sent to every switch interface, even with IGMP snooping enabled on the switch. OSPF only uses multicast on broadcast networks, and it is necessary in order to use DR and BDR, which are only on broadcast networks. For point-to-point links, OSPF uses unicast, and for non-broadcast networks you use the neighbor
statement and it uses unicast.
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
3
down vote
The benefit of multicast is that hosts not subscribing to the multicast group ignore frames they receive that are sent to the multicast group. With broadcast, they cannot ignore the frames.
The OSPF multicast group is a link-local multicast that gets sent to every switch interface, even with IGMP snooping enabled on the switch. OSPF only uses multicast on broadcast networks, and it is necessary in order to use DR and BDR, which are only on broadcast networks. For point-to-point links, OSPF uses unicast, and for non-broadcast networks you use the neighbor
statement and it uses unicast.
add a comment |Â
up vote
3
down vote
The benefit of multicast is that hosts not subscribing to the multicast group ignore frames they receive that are sent to the multicast group. With broadcast, they cannot ignore the frames.
The OSPF multicast group is a link-local multicast that gets sent to every switch interface, even with IGMP snooping enabled on the switch. OSPF only uses multicast on broadcast networks, and it is necessary in order to use DR and BDR, which are only on broadcast networks. For point-to-point links, OSPF uses unicast, and for non-broadcast networks you use the neighbor
statement and it uses unicast.
add a comment |Â
up vote
3
down vote
up vote
3
down vote
The benefit of multicast is that hosts not subscribing to the multicast group ignore frames they receive that are sent to the multicast group. With broadcast, they cannot ignore the frames.
The OSPF multicast group is a link-local multicast that gets sent to every switch interface, even with IGMP snooping enabled on the switch. OSPF only uses multicast on broadcast networks, and it is necessary in order to use DR and BDR, which are only on broadcast networks. For point-to-point links, OSPF uses unicast, and for non-broadcast networks you use the neighbor
statement and it uses unicast.
The benefit of multicast is that hosts not subscribing to the multicast group ignore frames they receive that are sent to the multicast group. With broadcast, they cannot ignore the frames.
The OSPF multicast group is a link-local multicast that gets sent to every switch interface, even with IGMP snooping enabled on the switch. OSPF only uses multicast on broadcast networks, and it is necessary in order to use DR and BDR, which are only on broadcast networks. For point-to-point links, OSPF uses unicast, and for non-broadcast networks you use the neighbor
statement and it uses unicast.
edited 1 hour ago
answered 1 hour ago
Ron Maupinâ¦
59k1058106
59k1058106
add a comment |Â
add a comment |Â
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