OSPF (Open Shortest Path First) is a link state routing protocol for interior routing within single autonomous system (AS).

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Packet captures of OSPFv2 with HMAC-SHA1 (RFC5709)

I'm looking to get my hands on packet captures showing a hello packet from OSPFv2 configured to use HMAC-SHA1 for authentication, or to find software that supports such a mode that I could use to ...
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0answers
11 views

How to relate entries in the OSPF-MIB::ospfIfTable to entries in the OSPF-MIB::ospfNbrTable

I'm in an environment with routers from multiple vendors (Cisco, Brocade, etc.). I'm trying to use SNMP to retrieve information that is roughly equivalent to what you can get from the CLI commands ...
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0answers
38 views

Cisco Packet Tracer Unable To Get OSPF to work [closed]

I'm pretty new to Cisco Packet Tracer as I'm currently in a computer networking course. I ran to an issue in which I am unable to resolve. I have four routers set up, R2, B1-R2, B2-R2, B3-R2. The ...
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0answers
53 views

How to correctly summarise routes in an OSPF multi-hub-and-spoke scenario?

I am looking at using OSPF/Quagga to provide high availability between a backbone and multiple remote locations (via GRE). I'm unable to get route summarisation working (forgive me if not the correct ...
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2answers
63 views

Load balancing across uneven links (Cisco\OSPF)

I know that OSPF will load balance across equal cost paths such as: R1 ------------------ R3 | 100mbit | | | | 1gbit| |100mbit | | ...
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0answers
93 views

DMVPN and OSPF (two tunnels dynamic routing)

please help me to resolve the problem with routing between dmvpn GRE tunnels. I've got a DMVPN HUB and SPOKE topology. HUB has public ip address in internet. SPOKE has two ISPs for redundancy. I've ...
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1answer
42 views

Reachability with OSPF on firewalled network

I'm trying to figure out how OSPF establishes routes when used on a network with firewalls. Say I have four routers (A, B, C, and D) and two firewalls (F1 and F2), arranged like so: (LocalA) A - F1 ...
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59 views

split ospf domain in two ospf domains interconnected with bgp (BIRD)

I have created a line topology consisting of 4 ospf routers (VMs running debian with the BIRD routing daemon): R1 (10.0.1.1) <-> (10.0.1.2) R2 (10.0.2.1) <-> (10.0.2.2) R3 (10.0.3.1) <-> ...
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2answers
587 views

OSPF routers (with BIRD on debian) recognize each other as neighbors but can't ping each other

I've created a "line" topology using virtual box - creating 4 machines and making a separate link between each using internal networks - R1 (eth0, 10.0.1.1) <-> (eth0, 10.0.2.1) R2 (eth2, 10.0.2.2) ...
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40 views

Is it possible to use a LAN in a VRF to administrate MPLS backbone?

In this topology, the customer connections and Internet access are working for everyone. The problem is that I need the LAN in VRF3(SITIO3) to have access to the ISP MPLS backbone (4 PE routers, 2 P ...
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1answer
201 views

redistribution OSPF RIP of directly connected networks

I am trying to learn redistribution between RIP and OSPF. I am using packet tracer. I have one router BRANCH that is configured with RIP v2. On fa0/0 there is the network 172.16.56.0/25, on fa0/1 the ...
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1answer
32 views

OSPF LSA Group Pacing

Is LSA group pacing enabled by default in Cisco IOS or something that needs to be configured under the OSPF process? How do you determine if it is currently enabled or not?
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66 views

Locating OSPF LSA Flooding In Wireshark

How can I identify the OSPF LSA flooding traffic which occurs every 30 minutes from a Wireshark capture? I'm finding it difficult to locate where the start and stop of this flooding process occurs in ...
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6answers
191 views

Wireshark Capture Between Two Routers

How would one go about capturing OSPF traffic in Wireshark between two routers? I'm looking to do something like this: [RTR A] - - - [LAPTOP] - - - [RTR B]
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1answer
69 views

Static into OSPF Redistribution

I am trying to create static routes which are redistributed as E1 Type 5 External OSPF LSAs. If I check the routing tables on my other connected routers, these redistributed routes show up properly. ...
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1answer
156 views

OSPF configuration in packet tracer

assume that I have 4 buildings which all connected to main building and in each building I have privileged subnet ( red circles ). privileged subnet must be able to connect each other, and rest of the ...
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1answer
396 views

How to redistribute connected /32 with quagga ospfd?

I have a VM host which acts as a quagga router. It announces routes to its hosted VM's (I don't use bridges, only routed VM's) It works well when tun interface is configured with a /30 ; for example ...
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0answers
49 views

OSPF on XEN host running several VMs

Is it possible to set OSPFs areas in a XEN environment to setup a virtual cluster? Main intention is to avoid a external router since all VMs will run inside the same machine.
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1answer
94 views

Importance of loopback ip address [closed]

Why do we configure loopback IP address in router RIP and router OSPF configuration ? What is the significance of configuring it ?
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3answers
574 views

Juniper OSPF subnet mismatch from Quagga router

I am trying to setup a OSPF area between a Juniper MX80 and a Quagga router. The Quagga router has OSPF configured and network 199.192.100.0/28 advertised in the hello packet. But the Juniper MX80 is ...
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1answer
674 views

Prevent Quagga from a certain subnet advertising

I have an Ubuntu 12.10 workstation with the following interfaces: eth0 : 10.11.1.15/24 lo:1 : 10.90.50.50/32 lo:2 : 10.1.100.100/32 tap0 : 10.5.200.200/24 As you can see, all IPs fit in 10.0.0.0/8 ...
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2answers
187 views

replacing 3 Cisco Catalyst 4500

Our network supplier recommends replacing our 3 cisco catalyst 4500's because they are EOL and dont speak OSPF (which we really want) Its not my area of expertise so I cant say for sure if we really ...
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1answer
286 views

enabling MPLS,RSVP and OSPF-TE

I am using Juniper J-series routers to emulate a small telco and VPN customer.I need to use OSPF so that the routing information can be propagated to all P and PE nodes (basically all core and edge ...
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3answers
853 views

Static-to-OSPF Route Redistribution

Is it possible to use redistribution of static-to-ospf in order to create an external OSPF route other than the type E2? Does this process only create a type 5 LSA and can any other LSA types be ...
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1answer
94 views

EIGRP Neighbor State

I understand that OSPF has states that describe the status of a neighbor (e.g. Init and Full). Does EIGRP also have similar information? I'm programmatically trying to get the status of an EIGRP ...
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1answer
1k views

OSPF routing (quagga) FreeBSD. Routing tables doesn't change. Help please

I have a problem with my lab work. I need to provide network routing with ospf. My Net has the following layout: So... When I start 3 virtual machine with all working interfaces, everything is ok - ...
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3answers
509 views

What are the advantages of OSPF vs nexthop self with iBGP?

Assuming I have a fairly small network internally, but I have 4 routers each connected out to a different network. The routers are all sat next to each other connected via a switch. Each router uses ...
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2answers
312 views

How any routing protocol packet reaches(flows of operations) from NIC card (physical layer) to any Routing (OSPF/RIP/BGP) daemon?

The problem is rearding the routing protocol packet flow in any linux/unix device where multiple routing protocol daemons are running. How any routing protocol packet reaches(flows of operations) ...
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1answer
66 views

How OSPF Support Classless Domains

Link state Packet in OSPF contains : 1.Identification Number of sender. 2.Sequence Number. 3.Network Number. 4.Cost or metric. 5.Next Hop. i am not able to understand how OSPF support variable ...
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1answer
296 views

when choose OSPF and when RIP [closed]

A question asked in Cisco Interview : Which routing protocol will you use if you have 50 nodes in each area? Choose between OSPF , RIP and explain. Edit: I worked with the above Question and came up ...
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1answer
386 views

Unequal Cost Load Balancing via MPLS TE

Given the following network, with all sites' network routing tables built via OSPF: Site_A | Site_A_router | \ | Intermediate_site_C_router -- Other_sites | ...
4
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1answer
1k views

Monitoring OSPF links with SNMP

I am looking for a way to monitor OSPF links using SNMP. I have attempted to try to poll the Neighbor State of a specific peer, looking for a value of Full, and going into alarm once the value is no ...
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1answer
1k views

Cisco IOS command : default-information originate vs redistribute static

I am quite confusing with the Cisco IOS command. what's the actual difference between redistribute static as i learn in EIGRP whereas default-information originate in RIP/RIPv2/OSPF? I hope to get ...
4
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3answers
3k views

How to advertise routes to IPSec tunnels in OSPF using Cisco IOS

I have Cisco 1800 series router (running C181X-ADVIPSERVICESK9-M) with lots of IPSec tunnels. I want to add this router to OSPF and configure it to advertise routes to remote subnets accessible via ...
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4answers
10k views

What is the difference between OSPF and RIP?

What is the difference between OSPF and RIP? Could someone explain the advantages and disadvantage´╝č Also when I should use one or the other.
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1answer
1k views

OSPF: how to advertise the subnet of an OpenVPN server?

I have successfully configured OSPF on all of our HP ProCurve 7102 routers, and most of our internal Linux routers. Routes get advertised, and all is peachy. Except for the routes into the subnets ...
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1answer
595 views

OSPF: quagga and HP ProCurve not talking

This question is related to a previous one on OSPF routing. Based on the advice give to the previous question, I have now made myself a network diagram, identified the backbone area and all other ...
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1answer
439 views

Packet tracer error during setting up an OSPF default info metric

I'm trying to do some stuff with link backups in Cisco Packet Tracer 5.3.2. When I to set default info metric I'm getting a syntax error: X1>enable X1#configure Configuring from terminal, ...
6
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2answers
287 views

When to start using OSPF

We have 4 offices in different countries. They are all connected via VPN to each other (i.e. at least one VPN tunnel from each office to all other three). Each office has between 1 and 4 separate ...
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1answer
84 views

Do symmetrically set up routers/hosts have symmetrical routing tables?

Consider a network of two PCs, PC1 and PC2, connected to each other through a router. Note that the network is symmetrically disposed to PC1 and PC2. Once booted, the PC's run ospfd (over Quagga) and ...
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1answer
852 views

writing an iptables rule which forward OSPF packets from one interface to another

In a given machine I have got two interfaces eth0 and eth1. Cisco routers are connected, to both interfaces, eth0 and eth1 and I want OSPF packets which arrives on eth0 to be forwarded to eth1 and ...
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1answer
375 views

Cisco router not receiving OSPF updates

Or at least, that's what I think is happening. There doesn't appear to be a debug command for this, or to see if something is in the routing table. I'm testing out this setup in Packet Tracer. I have ...
2
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1answer
496 views

Redistribute OSPFv3 static route to RIPng

I have a IPv6 static route on a Cisco 2600 that is being redistributed to other Routers in the same OSPFv3 area. One of the routers (not the one with the static route) is also a participant in a ...
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2answers
244 views

How do I get started with setting up OSPF?

I'm a sys admin by trade but I've been tasked with heading up a team that will be implementing OSPF between the different offices in our company. I don't have any experience with OSPF so I'm not sure ...
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3answers
847 views

Tough routing problem with Linux, Quagga and OpenVPN

The Setup I have an OpenVPN server that acts as a central router. It is configured with "topology subnet" command. Clients are Debian Linux nodes and each have one (or more) subnets directly ...
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5answers
20k views

What is the difference between BGP and OSPF?

I want to setup a dynamic routing network´╝î I want to know, What is the difference between BGP and OSPF ? Does both two need to be used together commonly ?
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2answers
1k views

What to do when ping to OSPF multicast address doesn't work?

I'm adding a new router to the OSPF setup. Everything seems to be fine with the configuration but the state remains as INIT/DROTHER. When I do a ping to 224.0.0.5 from the new router all I get is: ...
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2answers
389 views

What will be the best OSPF design option?

A single LAN with several switches and computers exist within a single VLAN behind each router. There are no more routers behind the ones describe on the image. OSPF Area 0 already exists. Router ...
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1answer
416 views

How to configure machines in a public subnet with two gateways?

We have a single public /24 subnet, with a BGP router as the primary gateway. Now I'm interested in configuring a second router for redundancy. How do I deal with multiple gateways on the servers in ...
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1answer
435 views

How does ospf control flooding?

What method is used by ospf protocol to prevent looping of flooded packets for link state advertisements? The packet header does not contain any timestamp. How do the routers recognize that it is the ...