An EtherChannel is a way to use multiple physical interfaces as a single logical one. That logical one appears as a single interface to MAC table, STP and management plane. That solves two main concerns: it adds bandwidth and it prevents STP from considering several parallel links a loop, thus preventing it from being blocked.
Cisco VTP – the VLAN Trunking Protocol is a management tool for large L2 deployments. It provides a simple way to synchronize VLAN names and numbers across Cisco switching infrastructure, also automates some traffic optimizations (the VLAN pruning).
A quick recap: Virtual LANs and Trunking in Cisco Ethernet switches. There are different VLAN ranges, switchport modes and some ways to manage all that.
This is the second post about Demand in Routing. In the first post I covered some common demand-related points and Cisco On-Demand Routing. In today’s post I write a little about Routing Protocols and their behavior over on-demand circuits.
Apparently, there are several very distinct topics in routing which have the word “demand” in them. First, there is Cisco On-Demand Routing quasi-protocol, and then there are on-demand circuits which routing protocols must treat differently. Last but not least, the on-demand circuits are used for Routing Backup.