RFC 1765 (rfc1765) - Page 1 of 9
OSPF Database Overflow
Alternative Format: Original Text Document
Network Working Group J. Moy
Request for Comments: 1765 Cascade
Category: Experimental March 1995
OSPF Database Overflow
Status of this Memo
This memo defines an Experimental Protocol for the Internet
community. This memo does not specify an Internet standard of any
kind. Discussion and suggestions for improvement are requested.
Distribution of this memo is unlimited.
Abstract
Proper operation of the OSPF protocol requires that all OSPF routers
maintain an identical copy of the OSPF link-state database. However,
when the size of the link-state database becomes very large, some
routers may be unable to keep the entire database due to resource
shortages; we term this "database overflow". When database overflow
is anticipated, the routers with limited resources can be
accommodated by configuring OSPF stub areas and NSSAs. This memo
details a way of gracefully handling unanticipated database
overflows.
This memo is a product of the OSPF Working Group. Please send
comments to .
Table of Contents
1. Overview ............................................... 2
2. Implementation details ................................. 3
2.1 Configuration .......................................... 3
2.2 Entering OverflowState ................................. 4
2.3 Operation while in OverflowState ....................... 5
2.3.1 Modifications to Flooding .............................. 5
2.3.2 Originating AS-external-LSAs ........................... 6
2.3.3 Receiving self-originated LSAs ......................... 6
2.4 Leaving OverflowState .................................. 6
3. An example ............................................. 6
4. Administrative response to database overflow ........... 7
5. Operational experience ................................. 8
6. Possible enhancements .................................. 8
A. Related MIB parameters ................................ 8
References ............................................ 9
Security Considerations ............................... 9
Author's Address ...................................... 9
Moy