Tag Archives: OSPF

Bidirectional Forwarding Detection (BFD) on a Palo

Palo Alto Networks, Routing, , , , ,

To improve the convergence times of a routing protocol, BFD can be used. This feature monitors the adjacencies using some kind of ping packets. It detects link failures much faster than the routing protocol’s built-in keepalive timeouts.

The interesting part: You must only enable BFD rather than configure it in detail. The BFD peers are derived from the routing protocol’s adjacencies, e.g. the OSPF neighbours. Let’s have a look:

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Netzwerkprotokolle: Nachschlagewerk für Wireshark

Memorandum, Network, , , , , , , , , , , , ,

Wenn es im Netzwerk knirscht, versuchen Admins den Fehler in Analyse-Tools wie Wireshark anhand von Paketmitschnitten einzukreisen. Jedoch hat der Herr viel mehr Netzwerkprotokolle gegeben, als sich ein Admin-­Hirn in allen Details merken kann. Eine Referenzdatei, die zahlreiche korrekte Protokoll­abläufe enthält, gibt Orientierung.

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OSPFv2 Capture

Authentication, Cisco Systems, Routing, , , , , , , , ,

I already had an OSPFv2 for IPv4 lab on my blog. However, I missed capturing a pcap file in order to publish it. So, here it is. Feel free to have a look at another small lab with three Cisco routers and OSPFv2. Just another pcapng file to practise some protocol and Wireshark skills.

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OSPF Visualizer

Quagga, Routing, , , , ,

While reading the OSPF chapter in the Cisco CCNP ROUTE learning guide, I was interested in how to visualize an OSPF area. Since every router in the same area has a complete view of all routers and networks, it should be easy to draw a map. So, I searched through the web for this kind of OSPF plotter and found two different approaches. While none of them worked out of the box, I was able to run one of them with an additional software router (Quagga) inside my OSPF area which finally drew a map. Yeah. Here we go:

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OSPF for IPv4 Test Lab: Cisco Router & ASA, Juniper SSG & Palo Alto

Cisco ASA, Cisco Systems, Juniper Networks, Palo Alto Networks, Routing, , , , , ,

I tested OSPF for IPv4 in my lab: I configured OSPF inside a single broadcast domain with five devices: 2x Cisco Router, Cisco ASA, Juniper SSG, and Palo Alto PA. It works perfectly though these are a few different vendors.

I will show my lab and will list all the configuration commands/screenshots I used on the devices. I won’t go into detail but maybe these listings help for a basic understanding of the OSPF processes on these devices.

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