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 »
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 »
I remember all the insanely complicated things in my studies but forget the little stupid things. This is going to be a quick compile of my CCIE notes for VLAN’s A VLAN is a Layer 2 technology that shrinks the broadcast domain in your inter-network. If there were no VLANs, depending on the size of
CCIE Notes: VLAN’s Read More »
Many people don’t understand a private VLAN and when to use it. I will try to explain what it is and how to implement it properly. A private VLAN can block host-to-host communication at layer 2, only allowing them to talk to their default gateway. I say essentially out of their broadcast domain because a
VLAN Trunking Protocol, or VTP, is a Cisco proprietary protocol allowing you to pass VLAN information between switches. There are three modes that VTP can be configured in VTP Server mode is the default, and it will send VTP updates to other VTP servers or client devices over a trunk or port channel. VTP Client
VLAN Trunking Protocol Read More »