01-09-2024 03:14 AM - edited 01-09-2024 03:45 AM
I am configuring OSPF and while running packet captures I see at times hello packets are sent via unicast also I could see a few LS update packets are sent to a multicast address(as destination), may I know under what condition this happens?
Thanks in advance.
01-09-2024 04:04 AM - edited 01-09-2024 06:00 AM
Hello send as multicast
it send as unicast
If you use virtual link
If you use neighbor under ospf (mostly use when we have NBMA)
MHM
01-09-2024 05:16 AM
OSPF packets are exhcanged as unicasts for statically configured neighbors.
No hello packets are exchanged between members of virtual links(unless directly connected - then they will send regular multicast packets unless configured statically).
OSPF routers use unicast packets during extart/exchange and loading phases. After this they will transition to using multicast packets as usual. This reduces the amount of network traffic used for these traffic-heavy exchanges.
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