Doug,, There have been lots of statements about EIGRP that have been misleading at best. Take a look at the link below and see another discussion about this topic:
http://www.groupstudy.com/archives/ccielab/200506/msg00687.html http://www.mail-archive.com/[email protected]/msg72839.html https://supportforums.cisco.com/thread/211406 https://learningnetwork.cisco.com/thread/40817 In times like these, I like to refer back to this RFC which sum's it all up. http://tools.ietf.org/rfc/rfc1925.txt Joe Sanchez On Tue, Jul 31, 2012 at 9:02 PM, <[email protected]> wrote: > My understanding of EIGRP multicast packets was that the TTL is set to > one, and that this is the mechanism that prevents the packet from being > routed off the local subnet. > > However, doing a packet capture reveals that the TTL on EIGRP multicast > packets is actually 2. Some research hints that the same may be true for > RIP and OSPF, although I haven't verified. The Wireshark expert note > refers to RFC 3171, but that RFC doesn't mention TTL. Here is the actual > text of the note: > > "Time To Live" != 1 for a packet sent to the Local Network Control Block > (see RFC 3171) > > So what is the purpose of setting these TTL's to 2? Obviously, they are > not getting routed off the subnet, so some other mechanism is being used > to prevent this. > > Thanks, > > Doug > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
