Wassim

In this post, I expose some of my notes about Vlan Trunking Protocol (VTP) on Cisco gear. VTP and Pruning VLAN 1 is not eligible for pruning. So when you try to prune it manually on a switch, you get the following IOS error message: VLAN 1 does not appear on the list of VTP pruned VLANs by the way: Only on the VTP server can we set the “vtp pruning” command, which will propagate to VTP clients only. With it you do not need to configure VTP pruning manually on VTP clients. you can not add a list of pruning vlans in the same row, like you do in adding allowed vlans: to see which VLANs are eligible to be VTP pruned: “show interface {trunk int} switchport”: VTP Modes if there are extended VLANs on a switch, it can not neither be in VTP client nor in server mode. IOS will simply return an error message: the opposite: you can not create extended VLANs while the switch is in VTP server or client mode:

Here are a couple of notes I gathered around the subject of Cisco Etherchannel. We start by some concepts then learn how to configure L3 Etherchannels. Etherchannel concepts EtherChannel is a technology that allows a set of ports to be bundled into one logical interface. There is the logical port (the bundle) and one or more physical ports that constitute it. The physical ports are also called member ports . When one member port fails, traffic that was flowing through it gets redirected over the remaining operational member ports, transparently to the end user and without the network administrator intervention. A physical port can be a member of only one Etherchannel. We can configure an Etherchannel between a network device and a router, a switch, a server,… An EtherChannel can be: a Fast EtherChannel: an EtherChannel formed from Fast Ethernet interfaces a Giga EtherChannel: an EtherChannel formed from Gigabit Ethernet interfaces a port Channel: a layer 3 EtherChannel A port chan...