The lower the cost, the more likely the 14 interface is to be used to forward data traffic. This cost is configurable by the system administrator. This paper examines how ospf works and how it can be used to design and build large and complicated networks. Ospf version 2, introduced as rfc 2328 in 1998, has been one of the most widely deployed interior gateway protocols igps for intradomain routing.
Hp routers can also be configured to operate with the latest ospf standard, rfc 2178. This document is a specification of the open shortest path first ospf tcpip internet routing protocol. An edge connects vertex a to vertex b iff the intersection of column a and row b is marked with an x. Rip v1 v2 rfc 1057, 2453 ospf v2 rfc 1583, 2328 ospf equal cost multipath ecmp vrrp rfc 2338, 2787 64 instances acls 1,024 global diffserv qos rfc 2998 dns caching dhcpbootp relay primary and backup rfc3046 udp relay switch management specifications. Each ospf router maintains an identical database describing the autonomous systems topology. Ospf extensions for segment routing rfc 8665, december 2019. Unlike the cisco proprietary protocol eigrp which was developed by cisco to replace ripv2, ospf is vendor independent and is the most used routing protocol by enterprise networks today. For details on how to confi gure the system to operate with the rfc 2178, see configuring ospf on page 118.
Xmc20 vrx10 vrx10f router interface unit for mission. Fox615 fox612 erop1 erop1f router interface module. The designated router concept enables a reduction in the number of adjacencies required on a broadcast or nbma network. Ospf ospf open shortest path protocol link state protocol.
The open shortest path first ospf protocol, defined in rfc 2328, is an interior gateway protocol used to distribute routing information within a single autonomous system. The cisco implementation conforms to the ospf version 2 specifications detailed in the internet rfc 2328. It uses a link state routing lsr algorithm and falls into the group of interior gateway protocols igps, operating within a single autonomous system as. This means that it distributes routing information between routers belonging to a single autonomous system. Jun 11, 20 open shortest path first ospf was developed by the internet engineering task force ietf as a replacement to overcome the shortcomings of rip in rfc 2328. Prosafe 24, 24 sfp, and 48 port gigabit l3 managed stackable. Features of ospf v2 supports md5 and sha authentication. Standards track ospf version 2 status of this memo this document specifies an internet standards track protocol for the internet community, and requests discussion and suggestions for improvements. Rfc 5709, rfc 6549, rfc 6845, rfc 6860, rfc 7474, rfc 8042 author. Ospf version 3 for ipv6 techlibrary juniper networks.
The current version of ospf that is used for ipv4 is version 2 that was defined in request for comments rfc 2328. Rfc 29 radius accounting rfc 2154 ospf wdigital signatures password, md5 rfc 2236 igmp v2 rfc 2267 network ingress filtering rfc 2328 ospf v2 edge mode rfc 2362 pimsm edge mode rfc 2370 ospf opaque linkstate advertisement lsa option rfc 2385 protection of bgp sessions via the tcp. Restrictions for ospf rfc 3623 graceful restart helper mode, page 2. Interior gateway protocol igp rfc 2328 ospf version 2 on initialization or topology change in routing information, a router will generate a linkstate advertisement, which represents the collection of all linkstates on that router.
It is designed to be run internal to a single autonomous system. Ospf is classified as an interior gateway protocol igp. From this database, a routing table is calculated by constructing a shortestpath tree. The designated router is elected by the hello protocol. It is defined as ospf version 2 in rfc 2328 1998 for ipv4.
The cisco implementation conforms to the ospf version 2 specifications detailed in the internet rfc. View errata submit errata find ipr disclosures from the ietf. This memo documents version 2 of the ospf protocol. If a new router lsa link type is documented, the documentation should say how the link state id, link id, and link data fields are to be filled in, and how backward compatibility is maintained. Ipv6 ospfv3 interoperability test specification unhiol. Open shortest path first ospf v2 rfc 2328 rohitdhand. Lsasummaryarea 0 backbone mandatoryinterarea communication only through area 0no loops allowed among areasonly 2 levels hierarchy allowed 17 10. Up to 4 ospf v2 rfc 2328 instances vrfs tdm and psn including per module with. For details on how to configure the system to operate with the rfc 2178, see modify ospf standard.
The top of figure 1a shows two routers connected by a pointto point link. Ospf extension for the support of multiarea networks with. Rfc 768 udprfc 854859 telnetrfc 1057 ripigmp snooping supportport mirroring supportrfc 1157 snmp rfc 1757 rmon groups 1,2,3, and 9rfc 1534 dhcp and bootp interoperationrfc 1583 ospf v2 rfc 21, 22 dhcp and bootprfc 2236 igmp v2 rfc 2328 ospf v2 rfc 2338, 2787 vrrprfc 2453 rip v2 rfc 2998 diffservprivate enterprise mib. The configuration examples were performed on devices running panos 4. Snmp v1, v2c, v3 with multiple ip addresses rfc 1157, 19011910, 2574, 2575. Nov 12, 2011 open shortest path first ospf v2 rfc 2328 it is a link state routing protocol. Ospf version 2 was originally documented in rfc 1247. Open shortest path first ospf is a routing protocol for internet protocol ip networks. Up to 4 ospf v2 rfc 2328 instances vrfs vrf features. Ospf hierarchical ospf howinside areas full ospfflooding is limited to areasarea border routers summarize information.
We send simultaneously to the previous packet, a disguised lsa craft to match an lsa. Ospf offers many advantages over previous routing protocols rip in that it is very flexible and scalable to a number of different environments including those that are very large. Rfc 2328 ospf version 2 april 1998 router generates an lsa for the network and has other special responsibilities in the running of the protocol. Comparison of rip, ospf and eigrp routing protocols based on. Ospf is widely used in large networks such as isp backbone and enterprise networks. The following documents are referenced in this specification. In addition, all ospf routing protocol exchanges are authenticated.
This document gives stepbystep instructions for configuring and testing ospf using palo alto networks devices in both an activepassive and activeactive scenario. Among all the three chosen samples, ospf is the most widely used routing protocol in large enterprise networks. Ospf rfc 1583 and 2178 compliance hp routers are configured, by default, to be compliant with the rfc 1583 ospf v2 specification. Ospf v2 rfc 2328 with ecmp, ospf rfc 3101 dynamic host configuration protocol dhcpbootp and dhcp relay rfc 3046 802. Chapter 6 configuring ospfv2 information about ospfv2 ospfv2 supports ipv4, while ospfv3 supports ipv6. Yes md5 and plain text supports vlsm and route summarization support for ipv6 rfc 2740 fast convergence metric calculation. Moy j, 1998, ospf version 2, request for comments rfc 2328. Moy a cost is associated with the output side of each router interface.
Compared with rip, ospf can provide scalable network support and faster convergence times. Ospfv2 ospf version 2 is a routing protocol which is described in rfc 2328. Affected network devices running the ospf protocol may be impacted by this vulnerability if they receive a crafted lsa type 1 packet. Open shortest path first ospf v2 rfc 2328 it is a link state routing protocol. Area 2 is to be used as a transit area and rtb is the entry.
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