We continue the previous multicast lab. This time we take a look at how RPF check works, how we can prevent RPF failures, and how we can fix RPF issues with static mroutes. PIM uses RPF checks to prevent multicast routing loops. If a router…

These features allow us copy the traffic of a switchport or an entire VLAN and send the copied frames to another switchport. This destination port (where we send the copied frames to) can be on the same switch (SPAN), on a different switch in the…

In the previous post about VPLS implementation we configured the remote PEs manually under the VFI, like this: This solution is not scalable if the customer has a lot of remote sites and we have to configure each PE router manually, since we need a…

We're going to configure Layer 2 services for customers over an MPLS cloud using SR OS routers. First we're going to take a look at the P2P service called Epipe which effectively turns the MPLS cloud into an "emulated wire" and connects the two customer…

I've been experimenting with different router images and I tried to establish the OSPF neighbor adjacency between a Cisco and an Alcatel (SR OS) router. OSPF is an industry standard routing protocol (unlike ISIS for example), so it should be supported on both platforms and…

In this post I'm going to walk through how we can configure basic multicast routing using PIM Sparse-Mode. I'm going to walk though how the multicast traffic flows from the source to the receiver, what's the role of the Rendezvous Point (RP), how are the…

In this lab I'm going to use the same simple topology which I used in this post. Except that we're going to take a look how we can turn a Cisco IOS router into a stateless/stateful DHCPv6 server, what's the difference and how we can…

I'm going to configure a policer to restrict and meter the traffic coming from Customer 1 on one of the PE router. The topology I'm using is the same I've used in the MPLS L2VPN post. Except this time I configured Customer 1 in a…

In this lab we're going to implement IPv6 FHS with Router Advertisement Guard and IPv6 Snooping and in the following post I'll show how to configure DHCPv6 Guard. We configure IPv6 FHS on the access switch between the end hosts and the routers in the…

These two are optional features we can configure with Spanning-Tree. They are mutually exclusive: we configure one or the other, but you cannot configure both of them at the same time on the same interface. Where and how should we configure them? Let's take a…