Hmmm... A layer-3 protocol (BGP) encapsulated in a layer-3 protocol (IP). Does this sound anything like tunneling to anyone else? :-)
Sorry, slightly manic at the moment... Karen *********** REPLY SEPARATOR *********** On 12/13/2001 at 4:41 PM Howard C. Berkowitz wrote: >>Just an open question ? >> >>We read, learn and teach Routing protocols are at the >>NETWORK layer of the famous OSI model... > > >Protocol numbers are not an OSI concept, but a concept of IP. > >In any case, it is the function of a protocol that determines its >layer, not necessarily what it runs over. Routing protocols are >intended to provide management and control services at the network >layer. > >There was a relatively recent thread on this; check the archives. > >> >>But they have PROTOCOLS NUMBERS - TRANSPORT LAYER(such >>as IGRP protocol 9, EIGRP protocol 88 and OSPF >>protocol 89)and APPLICATION PORTS values - APPLICATION >>LAYER (RIP uses port 520 and BGP4 uses port 179) >>indicating they work in the upper layers and not in >>the network layer, although the result is shown int >>the NETWORK layer... >> >>So may question is... >> >>Do they really operate at LAYER 3 ? >> >>Warm regards, >> >>Jose Luis De Abreu Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=29146&t=29139 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
