In an attempt to find out why MTU is examined (more precisely, why it's examined in the Database Description packets instead of the Hello packets) one of my co-workers found this passage in IETF meeting minutes:
"Editor's note: These minutes have not been edited. The OSPF Working Group met on Wednesday, December 11th from 1300-2500 at the San Jose IETF. Minutes of the meeting follow: The second problem, reported by Dan Senie of Proteon, concerns MTU mismatches between OSPF neighbors. This can cause flooding between the two neighbors to fail, with large Link State Updates being continually retransmitted. To fix this, we will report interface MTU in Database Description packets. A router will discard received Database Description packet which advertise an MTU that is larger than the router can receive. In this way, adjacencies will not form between routers having MTU mismatches. Tony Li expressed a desire for a more general purpose mechanism. There was also a question whether the same thing will have to be done for OSPF for IPv6 (we think so)." Very informative. Thank goodness for meeting minutes. Here's the link if anyone is as hung up on this as I seem to be. :) http://www.ietf.org/ietf/ospf/ospf-minutes-96dec.txt Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=41766&t=41766 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
