ISIS Metric – 1st trap of Narrow and Wide metrics
1. Intro The ISIS Metric topic will have 3 parts: 2. The ISIS metric defaults A quick review of the ISIS metric defaults: 3. The unexpected impact of using both Narrow and Wide by default As already mentioned, Junos uses a combination of both Narrow and Wide metrics. But why use both? Well, the advantage […]
L2VPN – Overview and Basic Configuration
LDP (Martini) and BGP (Kompella) are two L2VPN technologies are supported in Junos. Both L2VPN technologies are used for connectivity of customer attachment circuits across the provider MPLS network. A L2VPN is a point-to-point connection between two PE routers. This type of VPN emulates transparent L2 services for the customers. Normally the L2 attachment circuits […]
RSVP – Basic Config
1) Configure family mpls and enable the mpls protocol on the interfaces. You have to enable the interface to accept labeled packets: Next the interfaces should be specified under protocols mpls hierarchy. This way MPLS will know which interfaces it can use to forward traffic. You can use the option all to add all interfaces […]
BGP Attributes
BGP attributes are grouped in four main classes: These attributes are very important to master for the JNCIE-SP lab exam.
Draft Rosen 7 – Sample Config
Configuration on 1st PE: Configuration on the P router: Configuration on the 2nd PE: Show commands:
Draft Rosen 6 – Sample config
Configuration on 1st PE: Configuration on the P router: Configuration on the 2nd PE: Show commands:
RIP – Quick notes
RIP is a distance-vector Interior Gateway Protocol. It calculates the shortest path by evaluating the distance to reach the prefix (vector). The distance used by RIP is the hop count. Routing updates are sent at a regular basis, which is 30 seconds by default. There are two versions of the RIP protocol, where version 2 […]
OSPF Neighborship Requirements and Troubleshooting
1. Intro It is often times a struggle to bring up an OSPF Neighborship between two routers. Well, it can be if you don’t clearly know all requirements. In this post we will see all OSPF neighborship requirements and how to troubleshoot when the neighbors are not UP. As a network engineer we must know […]
Protect RE – Configuring the Protect RE Filter
Intro In this post we will configure firewall filters to control traffic destined to the Routing Engine. As mentioned in the previous post, Common Network Protocols, we must know how the protocols work, how they are transported through the network, and how you can match them in the firewall filter. But before starting with the […]
ISIS Overload timeout – Testing the timeout knob
1. Intro First of all, lets quickly review the what the official documentation is saying about the ISIS overload timeout knob: You configure or disable overload mode in IS-IS with or without a timeout. Without a timeout, overload mode is set until it is explicitly deleted from the configuration. With a timeout, overload mode is […]