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So a buddy of mine and I are disputing the actual layer OSPF runs at. He states OSPF is purely layer 3. I say OSPF is layer 4. Since IP is required for OSPF to work, the OSPF is encapsulated in IP. To me, if you encapsulate anything in a L3 proto...
OK, so I have an interesting situation. I have a architecture that has 4 6509s in it and they're all interconnected in a cross hatch / direct link manner, so I have complete redundancy. The top (we'll call the Core) pair have an FWSM in them. Abov...
Well, the only reason I was classifying OSPF as transport was because it actually implements it's own checksum and ACK (something that TCP does). To me that's the workings of a transport protocol -- even though I realize that OSPF has more to the pr...
Right... I understand that ICMP has a protocol number as well as TCP and UDP do to. My point is that TCP and UDP are always placed at L4 and, just like all of the other protocols, are encapsulated into the IP packet. I would assume that all of the...
That's where I have a hard time buying into it... TCP and UDP are also referenced by protcol numbers in the IP header. The IP header has the "protocol" field and it will defined TCP, UDP, OSPF, etc... But, to me TCP is using IP as a vehicle and IP...
I still disagree with the verbage here in the 3rd sentence. Routing protocols don't actually "route" traffic. They build routing tables, but for them to be able to do that the network layer *must* be operational first. With that respect OSPF is de...
