Questions tagged [ospf]
For questions about OSPF. Open Shortest Path First (OSPF) is a link-state routing protocol for Internet Protocol (IP) networks.
451 questions
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Inter Router Communication
I'm doing some background reading on OSPF and EIGRP and Inter Router Communication.
This may sound silly but just wanted a wider perspective. From a routing perspective, all hops would be considered '...
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MTU size on physical and logical port in OSPF
A single physical interface has multiple sub-interfaces (VLAN interfaces). These sub-interfaces are configured with IP addresses and OSPF. The MTU of the physical interface has been increased, but the ...
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How can routing protocols such as OSPF and RIP use the network layer
I am currently reading the the network layer chapter in Kurose & Ross Computer Networking: a top down approach. I understand that one of the responsibilities (services) of the network layer is to ...
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OSPF Adjacency Issue Between a Physical and a Virtual Layer 3 Switch
I'm encountering a puzzling issue with OSPF adjacencies in a mixed network environment and would greatly appreciate any insights or suggestions.
Network Setup:
Devices Involved:
A Cisco 2900 router.
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Looped Routing Scenario
Scenario 1
Let's say router A needs to send a packet to the destination 192.168.23.2 (router B in the B-C subnet)
It routes the packet through C (at a cost of 10, next hop being 192.168.13.1), even ...
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Help understanding a use case to develop a network topology
I am self learning networking and now want to create a simple network topology in containerlab. This is only for a simple test lab. For this I am only using OSPF and BGP. I have came up with a ...
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OSPF Stub Networks and Loopback Interfaces
I have a question about Stub Networks in RouterLSA in OSPF for Loopback interfaces.
In RFC we can read: "If the state of the interface is Loopback, add a Type 3
link (stub network) as long as ...
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How is the next-hop for an OSPF route chosen if there are multiple equal paths?
Let's say, that a Juniper router learns a 10.10.10.46/31 prefix from two different OSPF routers:
root@r1> show route 10.10.10.46/31 protocol ospf
inet.0: 10037 destinations, 50063 routes (10034 ...
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OSPF - is the Designated Router the same thing as the Master Router?
Is it possible, to have a DR as a Slave Router?
So here is my knowledge:
The DR and the BDR are elected based on priority and then highest RID in an area, so every router can communicate with the DR ...
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Is it possible to accomplish Cisco IOS "prefix-suppression" functionality in Junos?
I have a network of three Juniper routers:
ge-0/0/* and lo0.0 interfaces are in OSPF area 0. My goal is to have only the loopback addresses in OSPF, but as seen below, the network 10.7.0.4/31 used ...
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OSFP anycast route different area
So.. lets pretend i need to advertise a route in anycast to the backbone, obviusly same route that in this case is 192.168.1.111 .
Can be a problem if the routers that advertise that route to the ...
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How can I implement BGP between two routers that have already been configured with different routing protocols?
I have two different AS with different IP ranges and subnets, and the first router stack is running RIP, and the second one is OSPF. I want to configure BGP between "Router-PT Router23" and &...
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CCNA OSPF Loopback as the router ID
FYI, I am studying for the CCNA and new to this.
The scenerio, 2 routers R1 and R2.
R1 Loopback IP as 192.168.0.1
R2 Loopback IP as 192.168.0.2
Using the loopback IP's as the router ID.
I provisioned ...
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How to configure OSPF to create desired routing paths?
Is there any way to assign OSPF cost so that when is traceroute 147.147.11.98 from R1
it goes like R1->R4->R5->R2
and when I traceroute 147.147.11.98 from R5
it goes like R5->R4->R1->...
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How does OSPF sense the physical media?
For different physical media types, OSPF behaves differently about electing a Designated Router or not. For example, non-multiaccess media links such as serial Point to Point do not need election for ...
