Questions tagged [ospf]

For questions about OSPF. Open Shortest Path First (OSPF) is a link-state routing protocol for Internet Protocol (IP) networks.

17 questions with no upvoted or accepted answers
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Is this a valid OSPF topology?

In the following topology: every Backbone router is an ABR. Router 2 belongs to three different areas, area 0, area 1, and area 4. is this a valid topology for OSPF ? it works as expected and it ...
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0answers
210 views

OSPF behavior for redistribute routes

I have 2 equal cost path links between PeerA and PeerB and all its interfaces are participating in the same OSPF area. When i redistribute a static route (172.16.2.0/24) from PeerB to A, does the ...
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0answers
61 views

OSPF peering not forming when authentication is enabled

OSPF peering between two of my routers went down 2 days before. After troubleshooting, I removed the authentication commands from both devices GRE tunnel interfaces ip ospf authentication message-...
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0answers
65 views

Connecting layer 3 switches together without trunking

I currently have 2x Juniper EX4200 and I'm looking into changing it into Ubiquiti EdgeSwitchs. The diagram: SW01 and SW02 are connected to each other using OSPF P2P. Both of the switches have their ...
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0answers
287 views

OSPF over IPIP tunnel doesn't work for CSR 1000v in AWS

I literally have the following topology shown in the figure below. I have 4 VPCs, each VPC has 3 subnets (1 for the VM instance and the other 2 for interfaces). Each VPC hosts a Cisco CSR 1000v in ...
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0answers
248 views

OSPF NSSA - Type 7 LSA Metric Changes Unexpectedly

When a new path to an NSSA External (LSA type 7) route is brought up in the topology below, the existing path's cost to that route increments to exactly match the new path's cost. Therefore, both ...
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0answers
235 views

OSPF question from ISP perspective

Was hoping for some advice regarding an OSPF solution for a customer. Basically the customer has about 4 sites. These would all be linked together physically. I have attached a basic network ...
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0answers
915 views

A minimum OSPFv3 config of BIRD routers from topology

I'm experimenting with BIRD, and I want to converge simple network topology. I wonder how a minimal configuration file bird6.conf should look so that, for example, PC 1 can reach network between R2 ...
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0answers
201 views

BFD support for OSPF vyatta 6.2?

Is it possible to get support for BFD for OSPF on vyatta 6.2? I cannot find any information about it on the internet. The only thing I've seen is that the support is available on Brocade Vyatta 5400 ...
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0answers
143 views

It is possible to automaticly increment/decrement interface OSPF cost based on interface status?

I have cisco 3750 with three routed interfaces. IntA have an auto-assing cost of 1, IntB have an auto-assing cost of 10 and IntC have a manually-assing cost of 100. If IntB goes protocol down, I will ...
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1answer
634 views

Cisco ASA context OSPF configuration issue

I've two cisco ASA configured in active/active HA. ASA is connected to switch with port-channel. Switch configuration: interface Port-channel47 description ASA2 switchport mode trunk switchport ...
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0answers
33 views

Distance Command in OSPFv3

Does anyone know if there is a way to specify the distance of a specific neighbor in OSPFv3 in a Cisco router/switch? You seem to be able to do it for an entire area, but not for a specific neighbor ...
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0answers
41 views

Are OSPF standard areas consisting of only one router any use?

I am currently reviewing the OSPF configuration of an existing network in an attempt to streamline it. From a Layer 3 standpoint, this network consists of two core routers in Area 0 (CORE1 and CORE2) ...
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17 views

Would two ospf neighbors ever move from full to exchange?

I understand that when moving upwards from init through exchange to full states, ospf neighbors use received DBD packets to know which LSAs they need and make LSReqs as necessary. But, would 2 ospf ...
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27 views

Ospf and routes distribution

I'm doing some little cenarios in gns3 for classes but its getting messy. Let's say i have a router, if only FastEthernet 0/0 is on, the sh ipv6 route shows all routes, including the OSPF inter area ...
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1answer
108 views

OSPF Fast-Reroute Question

I'm running into a wall when doing some research on OSPF FRR. I came across this excerpt from the Cisco documentation: "Not all routes can have repair paths. Multipath primary routes might have ...
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2answers
362 views

IGP between 2 routers with an uncooperative router in the middle

I've got two routers, A and B. A gets some routes over BGP over a VPN connection, and has a leg on 10.0.0.0/24. It also can access the whole 10.0.0.0/16 via its default gateway. B is on 192.168.0.0/...