Ospf

Summary Post - OSPF Network Statement Order and Matching

2014-07-10 ·2 min read

When you configure OSPF network statements, IOS orders them most-specific to least-specific then does a top-to-bottom match of the interfaces. It doesn’t matter which order you put them in, the …

area network ospf specific statement

EIGRP and OSPF - Are We Connected?

2014-06-27 ·2 min read

For both OSPF and EIGRP routers to become neighbors, their interface’s primary IP address must be on the same subnet. That statement is true. There is a difference in the definition of …

eigrp mask neighbor ospf peer subnet

Junos Basics - OSPF

2012-02-01 ·2 min read

Oh, my. Another Junos post. Somebody stop me before I get my JNCIA! This isn’t hard stuff at all. I’m sure there are a couple of cool tricks I don’t know yet, but let’s try …

junos ospf security srx zone

A Little OSPF Story

2011-09-12 ·3 min read

Here’s a story from last week with little of no teaching value. I got a call from one of our business units looking for some routing help. We don’t usually care about their production …

area ospf

I was studying via Google+ Hangout the other day with CJ and Rob, and one of the topics that came up was that OSPFv2 advertises all loopbacks as 32-bit no matter what the configured mask is. I rarely …

ipv6 loopback ospf ospfv2 ospfv3 route

OSPF Notes - Authentication

2011-06-10 ·1 min read

Corrections appreciated. Type 0 : No authentication. This is the default type. R0(config-if)#ip ospf authentication null ----- R0(config-router)#area 1 virtual-link 2.2.2.2 authentication null Type 1 …

350-001 authentication ccie digest md5 ospf type written

OSPF Notes - Network Types

2011-06-04 ·1 min read

Corrections are always welcome. Broadcast : Think an Ethernet segement DR/BDR? : Yes Default hello interval : 10 sec Neighbor config required? : No Point-to-point : Physical point-to-point links, …

350-001 ccie network ospf type

OSPF Notes - LSA Types

2011-06-02 ·2 min read

Yes, it is inevitable that I cover these. I’m sure network types will be next. Per my usual request, please correct my stupidity. Type 1 - Router : This LSA type lists all the routers by RID as …

350-001 ccie cisco dbd hello lsa lsack lsr lsu message ospf type written

OSPF Notes - Neighbor States

2011-06-02 ·2 min read

My prediction about covering network types was wrong. I’m going to puke out some information about neighbor states for now. As is always the case, corrections are welcome. Down : No hellos have …

350-001 ccie cisco dbd hello lsa lsack lsr lsu message ospf type written

OSPF Notes - Message Types

2011-06-01 ·2 min read

I have had my nose deep in several books in preparation for my CCIE R&S written exam, so I haven’t been blogging much at all. Now that I’ve made it to the more familiar topics, …

350-001 ccie cisco dbd hello lsa lsack lsr lsu message ospf type written