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Questions tagged [ospf]

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

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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 routers).Note that I don't want the routing…
liv2hak
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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 - routing tables is right, all connections work. But…
Corwin
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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 length Sub-netting, looking at the contents of link…
Amol Sharma
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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, memory, or network [terminal]? Enter configuration…
om-nom-nom
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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 the router run OSPF. After giving sufficient time…
Ganesh
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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 vice versa (see image below). I have tried issued…
Tzury Bar Yochay
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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 3 routers and a webserver From left to right, you…
KdgDev
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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: CB# ping 224.0.0.5 Type escape sequence to…
3D1L
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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 CBA already exists with static routes. LM and RH are…
3D1L
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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 same advertisement that they sent…
Rohit Banga
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How to properly include vlan configuration for preexisting OSPF routing in PT

I am using packet tracer to simulate an enterprise setting. There would be a "main" office (marked as Bgta) and other minor offices in other cities, such as Mdlln. In the main office there should be some servers and in each city some hosts. The…
sar
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Quagga OSPFv3 does not update IPv6 routes

NOTE: I've posted this on SuperUser but reposting here because I think it may be more suitable. I'm trying to configure Quagga to use OSPFv3 to create proper IPv6 routes between two OpenWrt routers running OpenVPN (tun mode). I know the tunnel is…
Dan
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how to reach a subnet using a parent router via OSPF

I am trying to configure OSPF (using bird) to reach a subnet from a router that has no direct connection to the node with the subnet, something like this: The AS has two networks, but for testing purposes, I am announcing them in different VMs, VM1…
nbari
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Nagios on a virtual network

I am trying to emulate a virtual network in Kathara (ex. NetKit), based on OSPF and BGP routing and I am new to this. After emulating the network I need to monitor it using Nagios, but my question is how is it possible? My virtual network is running…
Jul
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How to add the normal routing information of a router to BIRD?

Suppose the following network layout: R1: R2: 10.1.1.0/24 <--- 10.1.1.1, 192.168.1.1 <----------> 192.168.1.2, 10.1.2.1 ---> 10.1.2.0/24 BIRD is installed on both R1 and R2. All…
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