Friday, March 25, 2011
Redundancy in a hierarchical network:
As businesses become increasingly dependent on thenetwork, the availability of the network infrastructurebecomes a critical business concern.
- Redundancy is the solution for achieving the necessaryavailability.
- Layer 2 redundancy improves the availability of thenetwork by implementing alternate network paths byadding equipment and cabling.
1. The VLAN Management Challenge
- As the number of switches increases on a small- or medium-sized business network, the overalladministration required to manage VLANs and trunksbecomes a challenge.
2. Small Network VLAN Management
- The figure shows a network manager adding a newVLAN, VLAN30.
- The network manager needs to update the threetrunks to allow VLANs 10, 20, 30, and 99.
- Recall that a common error is forgetting to updatethe allowed list of VLANs on trunks.
3. Larger Network VLAN Management
- After you have manually updated this network a fewtimes, you may want to know if there is a way for theswitches to learn what the VLANs and trunks are so thatyou do not have to manually configure them.
- VLAN trunking protocol (VTP).
A VLAN allows a network administrator to create groupsof logically networked devicesthat act as if they are ontheir own independent network, even if theyshare acommon infrastructure with other VLANs.
- Using VLANs, you canlogically segment switchednetworks based onfunctions,departments, or project teams. - A VLAN is a logicallyseparate IP subnetwork.
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