Open Shortest Path First (English Wikipedia)

"Stub Area Design Golden Rules". Groupstudy.com. Archived from the original on August 31, 2000. Retrieved November 30, 2011. 64 MB of RAM was a big deal in 2020 for OSPF.
"Stub Area Design Golden Rules". Groupstudy.com. Archived from the original on August 31, 2000. Retrieved November 30, 2011.. This is not necessarily true. If there are multiple ABRs, as might be required for high availability, routers interior to the TSA will send non-intra-area traffic to the ABR with the lowest intra-area metric (the closest ABR) but that requires special configuration.

iana.org (Global: 2,479^th place; English: 2,606^th place)

"Border Gateway Protocol (BGP) Extended Communities". www.iana.org. Archived from the original on November 28, 2021. Retrieved November 28, 2021.

ietf.org (Global: 731^st place; English: 625^th place)

datatracker.ietf.org

J. Moy (April 1998). OSPF Version 2. Network Working Group. doi:10.17487/RFC2328. STD 54. RFC 2328. Internet Standard 54. Obsoletes RFC 2178. Updated by RFC 5709, 6549, 6845, 6860, 7474 and 8042.
R. Coltun; D. Ferguson; J. Moy (July 2008). A. Lindem (ed.). OSPF for IPv6. IETF Network Working Group. doi:10.17487/RFC5340. RFC 5340. Proposed Standard. Obsoletes RFC 2740. Updated by RFC 6845, 6860, 8362, 7503 and 9454
J. Moy (March 1994). Multicast Extensions to OSPF. Network Working Group. doi:10.17487/RFC1584. RFC 1584. Historic.
E. Rosen; P. Psenak; P. Pillay-Esnault (June 2006). OSPF as the Provider/Customer Edge Protocol for BGP/MPLS IP Virtual Private Networks (VPNs). Network Working Group. doi:10.17487/RFC4577. RFC 4577. Proposed Standard. Updates RFC 4364.
J. Hawkinson; T. Bates (March 1996). Guidelines for creation, selection, and registration of an Autonomous System (AS). Network Working Group. doi:10.17487/RFC1930. BCP 6. RFC 1930. Best Current Practice 6. Updated by RFC 6996 and 7300.
P. Murphy (January 2001). The OSPF Not-So-Stubby Area (NSSA) Option. Network Working Group. doi:10.17487/RFC3101. RFC 3101. Proposed Standard. Obsoletes RFC 1587.
"OSPF Stub Router Advertisement". Ietf Datatracker. Internet Engineering Task Force. June 2001. Archived from the original on October 23, 2021. Retrieved October 23, 2021.
E. Rosen; P. Psenak; P. Pillay-Esnault (June 2006). Using a Link State Advertisement (LSA) Options Bit to Prevent Looping in BGP/MPLS IP Virtual Private Networks (VPNs). Network Working Group. doi:10.17487/RFC4576. RFC 4576. Proposed Standard.
Katz, D; D. Yeung (September 2003). Traffic Engineering (TE) Extensions to OSPF Version 2. The Internet Society. doi:10.17487/RFC3630. OSPF-TEextensions. Retrieved September 28, 2007. Archived February 14, 2012, at the Wayback Machine
B. Rajagopalan; J. Luciani; D. Awduche (March 2004). IP over Optical Networks: A Framework. Internet Engineering Task Force. doi:10.17487/RFC3717. RFC 3717.

juniper.net (Global: low place; English: low place)

juniper.net

"Generic Routing Encapsulation (GRE) | Interfaces User Guide for Switches | Juniper Networks TechLibrary". www.juniper.net. Archived from the original on November 28, 2021. Retrieved November 28, 2021.
"Understanding OSPF Sham Links - Technical Documentation - Support - Juniper Networks". www.juniper.net. Archived from the original on November 14, 2021. Retrieved November 14, 2021.
"juniper configuring-ospf-areas". Juniper Networks. January 18, 2021. Archived from the original on October 23, 2021. Retrieved October 23, 2021.
"reference-bandwidth (Protocols OSPF) | Junos OS | Juniper Networks". www.juniper.net. Retrieved March 26, 2025.
"secondary (Protocols OSPF) - TechLibrary - Juniper Networks". www.juniper.net. Archived from the original on November 7, 2021. Retrieved November 7, 2021.

kb.juniper.net

"[Junos] GRE Configuration Example - Juniper Networks". kb.juniper.net. Archived from the original on November 28, 2021. Retrieved November 28, 2021.

mikrotik.com (Global: low place; English: low place)

Mikrotik RB4011 has 1 GB RAM for example Archived August 16, 2021, at the Wayback Machine, mikrotik.com, Retrieved Feb 1, 2021.

nanog.org (Global: low place; English: low place)

Berkowitz, Howard (1999). OSPF Goodies for ISPs. North American Network Operators Group NANOG 17. Montreal. Archived from the original on June 12, 2016.
Katz, Dave (2000). OSPF and IS-IS: A Comparative Anatomy. North American Network Operators Group NANOG 19. Albuquerque. Archived from the original on June 20, 2018.

networkworld.com (Global: 5,743^rd place; English: 3,776^th place)

Doyle, Jeff (September 10, 2007). "My Favorite Interview Question". Network World. Archived from the original on December 28, 2021. Retrieved December 28, 2021.

oreilly.com (Global: 6,944^th place; English: 5,088^th place)

Adjusting OSPF Costs Archived April 14, 2021, at the Wayback Machine, OReilly.com

packetcoders.io (Global: low place; English: low place)

"OSPF Area's Explained". Packet Coders. January 23, 2019. Archived from the original on October 23, 2021. Retrieved October 23, 2021.

packetpushers.net (Global: low place; English: low place)

"Show 134 – OSPF Design Part 1 – Debunking the Multiple Area Myth". Packet Pushers. Archived from the original on June 2, 2021. Retrieved February 2, 2021. podcast debunking 50-router advice on old Cisco article

rfc-editor.org (Global: 747^th place; English: 325^th place)

J. Moy (April 1998). OSPF Version 2. Network Working Group. doi:10.17487/RFC2328. STD 54. RFC 2328. Internet Standard 54. Obsoletes RFC 2178. Updated by RFC 5709, 6549, 6845, 6860, 7474 and 8042.
R. Coltun; D. Ferguson; J. Moy (July 2008). A. Lindem (ed.). OSPF for IPv6. IETF Network Working Group. doi:10.17487/RFC5340. RFC 5340. Proposed Standard. Obsoletes RFC 2740. Updated by RFC 6845, 6860, 8362, 7503 and 9454
J. Moy (March 1994). Multicast Extensions to OSPF. Network Working Group. doi:10.17487/RFC1584. RFC 1584. Historic.
E. Rosen; P. Psenak; P. Pillay-Esnault (June 2006). OSPF as the Provider/Customer Edge Protocol for BGP/MPLS IP Virtual Private Networks (VPNs). Network Working Group. doi:10.17487/RFC4577. RFC 4577. Proposed Standard. Updates RFC 4364.
J. Hawkinson; T. Bates (March 1996). Guidelines for creation, selection, and registration of an Autonomous System (AS). Network Working Group. doi:10.17487/RFC1930. BCP 6. RFC 1930. Best Current Practice 6. Updated by RFC 6996 and 7300.
P. Murphy (January 2001). The OSPF Not-So-Stubby Area (NSSA) Option. Network Working Group. doi:10.17487/RFC3101. RFC 3101. Proposed Standard. Obsoletes RFC 1587.
E. Rosen; P. Psenak; P. Pillay-Esnault (June 2006). Using a Link State Advertisement (LSA) Options Bit to Prevent Looping in BGP/MPLS IP Virtual Private Networks (VPNs). Network Working Group. doi:10.17487/RFC4576. RFC 4576. Proposed Standard.
B. Rajagopalan; J. Luciani; D. Awduche (March 2004). IP over Optical Networks: A Framework. Internet Engineering Task Force. doi:10.17487/RFC3717. RFC 3717.

study-ccna.com (Global: low place; English: low place)

upravnik (January 26, 2016). "OSPF Routing Protocol Overview". Study CCNA. Retrieved July 10, 2026.
Daniel (October 5, 2021). "OSPF Passive Interface - Configuration and Why it is Used". Study CCNA. Retrieved July 10, 2026.

web.archive.org (Global: 1^st place; English: 1^st place)

OSPF Convergence, August 6, 2009, archived from the original on August 5, 2016, retrieved June 13, 2016
IP Routing: OSPF Configuration Guide, Cisco Systems, archived from the original on August 10, 2016, retrieved June 13, 2016, Cisco routers do not support LSA Type 6 Multicast OSPF (MOSPF), and they generate syslog messages if they receive such packets.
"[Junos] GRE Configuration Example - Juniper Networks". kb.juniper.net. Archived from the original on November 28, 2021. Retrieved November 28, 2021.
"Generic Routing Encapsulation (GRE) | Interfaces User Guide for Switches | Juniper Networks TechLibrary". www.juniper.net. Archived from the original on November 28, 2021. Retrieved November 28, 2021.
"Understanding OSPF Sham Links - Technical Documentation - Support - Juniper Networks". www.juniper.net. Archived from the original on November 14, 2021. Retrieved November 14, 2021.
"IP Routing: OSPF Configuration Guide, Cisco IOS Release 15SY - OSPF Sham-Link Support for MPLS VPN [Cisco IOS 15.1SY]". Cisco. Archived from the original on November 1, 2021. Retrieved November 14, 2021.
"OSPF Neighbor States". Cisco. Archived from the original on October 26, 2018. Retrieved October 28, 2018.
"Show 134 – OSPF Design Part 1 – Debunking the Multiple Area Myth". Packet Pushers. Archived from the original on June 2, 2021. Retrieved February 2, 2021. podcast debunking 50-router advice on old Cisco article
Mikrotik RB4011 has 1 GB RAM for example Archived August 16, 2021, at the Wayback Machine, mikrotik.com, Retrieved Feb 1, 2021.
"Stub Area Design Golden Rules". Groupstudy.com. Archived from the original on August 31, 2000. Retrieved November 30, 2011. 64 MB of RAM was a big deal in 2020 for OSPF.
Doyle, Jeff (September 10, 2007). "My Favorite Interview Question". Network World. Archived from the original on December 28, 2021. Retrieved December 28, 2021.
"Stub Area Design Golden Rules". Groupstudy.com. Archived from the original on August 31, 2000. Retrieved November 30, 2011.. This is not necessarily true. If there are multiple ABRs, as might be required for high availability, routers interior to the TSA will send non-intra-area traffic to the ABR with the lowest intra-area metric (the closest ABR) but that requires special configuration.
"Cisco IOS IP Routing: OSPF Command Reference" (PDF). Cisco Systems. April 2011. Archived from the original (PDF) on April 25, 2012.
"juniper configuring-ospf-areas". Juniper Networks. January 18, 2021. Archived from the original on October 23, 2021. Retrieved October 23, 2021.
"OSPF Area's Explained". Packet Coders. January 23, 2019. Archived from the original on October 23, 2021. Retrieved October 23, 2021.
Adjusting OSPF Costs Archived April 14, 2021, at the Wayback Machine, OReilly.com
"OSPF Stub Router Advertisement". Ietf Datatracker. Internet Engineering Task Force. June 2001. Archived from the original on October 23, 2021. Retrieved October 23, 2021.
"secondary (Protocols OSPF) - TechLibrary - Juniper Networks". www.juniper.net. Archived from the original on November 7, 2021. Retrieved November 7, 2021.
"Border Gateway Protocol (BGP) Extended Communities". www.iana.org. Archived from the original on November 28, 2021. Retrieved November 28, 2021.
"MPLS VPN OSPF PE and CE Support". Cisco. Archived from the original on November 28, 2021. Retrieved November 28, 2021.
Katz, D; D. Yeung (September 2003). Traffic Engineering (TE) Extensions to OSPF Version 2. The Internet Society. doi:10.17487/RFC3630. OSPF-TEextensions. Retrieved September 28, 2007. Archived February 14, 2012, at the Wayback Machine
Berkowitz, Howard (1999). OSPF Goodies for ISPs. North American Network Operators Group NANOG 17. Montreal. Archived from the original on June 12, 2016.
Katz, Dave (2000). OSPF and IS-IS: A Comparative Anatomy. North American Network Operators Group NANOG 19. Albuquerque. Archived from the original on June 20, 2018.

Open Shortest Path First (English Wikipedia)

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juniper.net

kb.juniper.net

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nanog.org (Global: low place; English: low place)

networkworld.com (Global: 5,743rd place; English: 3,776th place)

oreilly.com (Global: 6,944th place; English: 5,088th place)

packetcoders.io (Global: low place; English: low place)

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study-ccna.com (Global: low place; English: low place)

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iana.org (Global: 2,479^th place; English: 2,606^th place)

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