Our last post looked at Q-in-Q tunneling using one port, but what if you had to extend an EtherChannel from one data center to the other? We can also use Q-in-Q tunneling with EtherChannel. The train of thought is similar to how we did just a straight Q-in-Q tunnel, but now, with EtherChannel, we need […]
802.1 Q-in-Q Tunneling using Etherchannels Read More »
802.1 Q-in-Q tunneling is a technique that can extend a VLAN from one data center to another without AToM or VPLS. Essentially, Q-in-Q tunneling adds another .1q tag to your packet as it traverses the Service Providers network. This keeps your traffic segregated from any other company, following the same principle of how VLANs segregate
802.1 Q-in-Q Tunneling Read More »
This blog is coming from sunny and humid Jacksonville, Florida. Today, we will look at controlling the RIP routing domain using Offset-Lists and Administrative Distance. We must remember that RIP is a distance-vector routing protocol with no idea what the network topology looks like. With this, we can trick RIP into thinking a network is
Controlling RIP with Offset-Lists and Administrative Distance Read More »
So today, I checked to see if I could schedule the lab, and I was able to. Thinking I couldn’t get the date I had in mind, I searched for it. San Jose had no open seats, but RTP had 5. I just struck gold, and it was meant to be; I registered for the
CCIE Lab is Tentatively Scheduled Read More »
As you may tell by the blog title, I took my CCIE R&S Written test today and did not come out victorious. Without breaking any NDA’s, I just barely failed, which usually would upset me, but I know where my faults are and where I did very well. I also attempted to take a test
EIGRP Feature Summary EIGRP Updates Once routers are adjacent, they can exchange EIGRP update messages, which follow; EIGRP uses Reliable Transport Protocol (RTP) to send multicast EIGRP updates. EIGRP sends updates and waits for a unicast ACK reply from the neighbor the update was sent. If an ASK is not received in the Retransmission Timeout
IP forwarding is how packets go from one side of the network to the other. It is also known as IP routing. So we can have a base understanding, let’s look at the diagram below. How does the R3 know how to forward the telnet packet to R1? Fast Switching and Cisco Express Forwarding (CEF)
CCIE Notes: IP Forwarding Basics Read More »
When dealing with IP services, you deal with service elements of the IP protocol carried on the IP datagram stream. Some of the IP services we are looking at; ARP We are first going to look at ARP. ARP maps IP addresses to MAC addresses. Before a host can send data, it must do an
CCIE Notes: IP Services Read More »
Whether we are talking about EtherChannels or PortChannels, we are talking about the same technology. That technology is a way to allow you to treat multiple physical links as one link to Spanning-Tree, and you can also do some load-balancing on them. There are two types of port channels. They can be a layer 2
CCIE Notes: Etherchannels Read More »
Spanning-Tree is a layer 2 loop detection mechanism for a switched network. There are several spanning-tree standards Cisco also has two proprietary types of spanning tree; One of the most important pieces of a spanning tree is electing a root switch. You can leave the election up to chance or “rig” the election how you
CCIE Notes: Spanning-Tree Read More »