- Written by Sarah Chen
- Posted on October 9, 2019
- Updated on October 9, 2019
- 7159 Views
The General Router ID configuration provides the ability to configure a common Router ID for all routing protocols
- Written by Sidharth
- Posted on February 26, 2024
- Updated on February 26, 2024
- 2363 Views
The EOS implementation of OSPF uses an alternate Area Border Router (ABR) behavior as specified in the IETF draft document. This is implemented as an optimization over the standard OSPF so that the packets would not be dropped when a router loses Active backbone connection which could otherwise be successfully forwarded.
- Written by Tanushree Bansal
- Posted on August 31, 2023
- Updated on September 4, 2023
- 4160 Views
This feature adds the support for OSPF multi-site domains described in RFC 4577(OSPF as the Provider/Customer Edge Protocol for BGP/MPLS IP Virtual Private Networks (VPNs) ) and enables routes BGP VPN routes to retain their original route type if they are in the same OSPF domain. Two sites are considered to be in the same OSPF domain if it is intended that routes from one site to the other be considered intra-network routes.
- Written by Chitra Ramachandran
- Posted on August 18, 2020
- Updated on August 18, 2020
- 6628 Views
An OSPF router can attract all traffic towards itself from within the OSPF network, by advertising a default route.
- Written by Zetang Lei
- Posted on March 3, 2023
- Updated on March 6, 2023
- 4416 Views
This feature introduces metric profiles to OSPF metric configurations. Metric profiles allow multiple metric configurations to be applied on the interface at the same time. When the interface speed drops below certain thresholds, the interface will automatically change the metric it uses based on the configurations in the metric profile.
- Written by Chris Roche
- Posted on December 16, 2019
- Updated on March 30, 2022
- 8082 Views
This feature introduces the support for OSPF routes over GRE tunnels under default as well as non-default VRFs. The feature is disabled by default.
- Written by Hind Kishore Geel
- Posted on December 22, 2020
- Updated on February 5, 2022
- 7982 Views
This feature introduces the support for OSPF routes over GRE tunnels under default as well as non default VRFs. The
- Written by Haris S M
- Posted on August 31, 2023
- Updated on September 4, 2023
- 4368 Views
Configuring OSPF as PE-CE protocol enables us to distinguish between the “real external routes” and intra network routes between the sites that are stretched across VPN. But the problem arises when VPN sites are in the same area and have a backdoor connection. With OSPF as PE-CE protocol redistribution, CE routers end up getting inter-area routes(assuming the VRFs on the PE devices that connect the CE sites, are configured with the same OSPF domain id) that actually belong to the same area and just happen to be multihomed to the backbone.
- Written by Chris Roche
- Posted on August 25, 2020
- Updated on August 30, 2020
- 6277 Views
Section 9.5 of RFC2328 “OSPF Version 2” states that the mask in Hello packets should be set to 0.0.0.0 when
- Written by David Blease
- Posted on November 12, 2019
- Updated on December 19, 2023
- 6461 Views
In an OSPFv2 Area Border Router (ABR), area filters may be used to prevent specific prefixes from being announced by an area as Type 3 Summary LSAs or routes to AS boundary routers as Type-4 ASBR summary LSAs.
- Written by Sandra Goodwin-Jette
- Posted on June 12, 2019
- Updated on June 19, 2019
- 5926 Views
The OSPFv2 Secure Hash Algorithms (SHA) Authentication support as defined in RFC 5709 supports the configuration of
- Written by Nikhil Satish Pai
- Posted on June 13, 2019
- Updated on June 13, 2019
- 6250 Views
OSPF supports all of RFC3630 and parts of RFC4203. When configured, OSPF generates the following information in
- Written by Haris S M
- Posted on June 28, 2024
- Updated on June 28, 2024
- 1038 Views
Configuring OSPF as PE-CE protocol enables us to distinguish between the “real external routes” and intra network routes between the sites that are stretched across VPN. But the problem arises when VPN sites are in the same area and have a backdoor connection. With OSPFv3 as PE-CE protocol redistribution, CE routers end up getting inter-area routes (assuming the VRFs on the PE devices that connect the CE sites, are configured with the same OSPFv3 domain id) that actually belong to the same area and just happen to be multihomed to the backbone.
- Written by Nikhil Satish Pai
- Posted on March 24, 2021
- Updated on March 30, 2021
- 7104 Views
This feature may be used for redistributing OSPFv2 leaked and non leaked routes from one instance to another when
- Written by Hillol Chakraborty
- Posted on September 15, 2023
- Updated on September 15, 2023
- 3768 Views
TStarting from EOS-4.17.0F, the capability of advertising IPv4 unicast Network Layer Reachability Information (NLRI) with IPv6 next-hops over IPv6 peering sessions, as described in the Extended Next Hop Encoding capability in RFC5549, is supported. This document describes the feature that allows the redistribution of such routes into OSPF.
- Written by Sulyab Thottungal Valapu
- Posted on December 7, 2020
- Updated on December 9, 2020
- 7230 Views
This document describes the feature that allows the redistribution of VRF leaked BGP routes into OSPFv2 and OSPFv3.
- Written by Deeksha Srivastava
- Posted on April 16, 2020
- Updated on April 22, 2020
- 8121 Views
When there are multiple VRFs on the device and there is a need to share routes between them, typically for shared
- Written by Deeksha Srivastava
- Posted on June 3, 2020
- Updated on June 29, 2023
- 8781 Views
VRF Route leaking can be used when routes from one VRF are required in another VRF (e.g. in case of shared services). If VrfLeak Agent is being used to leak routes, the leaked routes (in destination VRF) can be redistributed into IGPs.
- Written by Nikhil Goyal
- Posted on January 29, 2024
- Updated on January 29, 2024
- 2812 Views
Segment Routing provides a mechanism to define end-to-end paths within a topology by encoding paths as sequences of sub-paths or instructions. These sub-paths or instructions are referred to as “segments”. OSPF Segment Routing (henceforth referred to as OSPF SR) provides means to advertise such segments through OSPF protocol.
- Written by Sulyab Thottungal Valapu
- Posted on December 7, 2020
- Updated on September 4, 2023
- 6198 Views
This document describes the OSPFv2 feature that allows the setting of “Down” (DN) bit in type-5 and type-7 LSAs. The DN Bit is a loop prevention mechanism implemented when OSPF is used as CE - PE IGP protocol. Its usage in OSPF is explained by RFC4576. By default, OSPF honors the DN-bit in type-3, type-5 or type-7 LSAs in non-default VRFs.