Questions tagged [ospf]
For questions about OSPF. Open Shortest Path First (OSPF) is a link-state routing protocol for Internet Protocol (IP) networks.
446
questions
0
votes
0
answers
11
views
Selecting iBGP over OSPF [closed]
in the book internet architectures by Sam Halabi, pg 228, this is the diagram link
it mentions
RTC receives the 0/0 via EBGP (from its own provider), IBGP, and OSPF. It ignores
the OSPF default, as ...
- 1
0
votes
0
answers
21
views
OSPF loopback route learned not installed in forwarding table in FRR [closed]
This should be a REALLY, REALLY simple OSPF config. I have 2 VM running FRR that I would like to announce their /32 loopback address between each other. The config is as below:
ip forwarding
ipv6 ...
1
vote
2
answers
70
views
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 ...
- 1,109
2
votes
1
answer
84
views
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 ...
- 131
1
vote
1
answer
83
views
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 ...
- 1,109
0
votes
1
answer
79
views
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 ...
- 1
1
vote
1
answer
323
views
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 &...
- 11
0
votes
0
answers
86
views
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 ...
- 1
1
vote
1
answer
91
views
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->...
0
votes
2
answers
53
views
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 ...
1
vote
0
answers
125
views
Redistribution Loops and Route Tagging
I've read that when we configure multipoint redistribution, it's a good idea to tag our routes to prevent them from being advertised from Protocol 1 - Protocol 2 - Back to Protocol 1.
Source: ...
- 877
0
votes
1
answer
319
views
Will an OSPF route in IOS be preferred over a static route? (It isn't Floating Static)
For the network topology attached in the image, a static route is configured with ip route 10.10.10.0 255.255.255.252 Ethernet0/0. Referring to the Topology and the output from the show ip route ...
3
votes
2
answers
253
views
OSPF Advertise only loopback not transit VLAN
I have this topology:
and this configuration:
R1
interface Loopback0
ip address 10.0.0.1 255.255.255.255
ip ospf 1 area 0
interface GigabitEthernet0/0
ip address 192.168.0.1 255.255.255.252
ip ...
- 399
0
votes
0
answers
31
views
Conflicting opinions for route aggregation [duplicate]
I am a student and I came accross this question:
An ABR in OSPF has in its range networks 10.0.8.9/24 to 10.0.21.0/24. how can it summarise the networks? not necessarily in one prefix.
What we ve ...
- 101
0
votes
1
answer
470
views
Interior vs Exterior Gateway Protocols
I'm new to Networking and I was reading about the Interior and Exterior Gateway Protocols ,but i couldn't understand some points , as stated in a reference:
IGPs are designed to work in private ...
- 133