JunOS | Aggregate Routes
In this post I will highlight what aggregate routes are, how to configure them and what is their use, using JunOS
Tag: routing
Admin Distance Bug?
Granted, this is a duplicate post as the one posted by Jeremy Stretch here. When I first read his post, I just couldn’t believe it so I thought I’d lab it myself. However, do notice that my lab here is just slightly different: I am advertising two networks (different from Jeremy’s lab) The two routing protocols have been set with identical administrative distances (Jeremy does this for the advertised route instead) I am assuming that the IOS version running on my routers is more recent (potentially different from Jeremy’s lab) Since I’m using Gig interfaces, I’ve updated the OSPF auto-cost ref. bandwidth…
The Discard Route
When we summarise a route, Cisco IOS will inject a discard route. It is all nice to understand what Cisco IOS does. However, we ought to ask the question: Why? This blog answers this question.
The ICMP Redirect
You will not find this very often though, you may come across a network where there are two routers on the same broadcast segment, each responsible for different networks. So how do you get your hosts to know which gateway should they use? You could setup two default gateways – both Windows and Linux allow that. However, you could also rely on ICMP Redirects. In this blog, I will show you what ICMP redirect is and in what circumstances it can be useful. I will be working on the following topology: The routing table on HOST1 and ROUTER1 look like…
Admin Distance Bug?
Granted, this is a duplicate post as the one posted by Jeremy Stretch here. When I first read his post, I just couldn’t believe it so I thought I’d lab it myself. However, do notice that my lab here is just slightly different: I am advertising two networks (different from Jeremy’s lab) The two routing protocols have been set with identical administrative distances (Jeremy does this for the advertised route instead) I am assuming that the IOS version running on my routers is more recent (potentially different from Jeremy’s lab) Since I’m using Gig interfaces, I’ve updated the OSPF auto-cost ref. bandwidth…
The Discard Route
When we summarise a route, Cisco IOS will inject a discard route. It is all nice to understand what Cisco IOS does. However, we ought to ask the question: Why? This blog answers this question.
The ICMP Redirect
You will not find this very often though, you may come across a network where there are two routers on the same broadcast segment, each responsible for different networks. So how do you get your hosts to know which gateway should they use? You could setup two default gateways – both Windows and Linux allow that. However, you could also rely on ICMP Redirects. In this blog, I will show you what ICMP redirect is and in what circumstances it can be useful. I will be working on the following topology: The routing table on HOST1 and ROUTER1 look like…