How to change the bridge priority without change the VLAN ID? If you want to change the switch’s bridge priority you can only change the total bridge priority (bridge priority + extended system ID) in units of 4096. The STP bridge priority can only be changed in units of 4096. The valid values you can configure are: 0, 4096, 8192, 12288, 16384, 20480, 24576, 28762, 32768, 36864, 40960, 45056, 49152, 53248, 57344 or 61440. The extended system ID will then be added to this number to make the total bridge priority value. Why 32768 default bridge priority? It’s because this field is 16 bits in length, and the most significant bit is set 1 by default. Therefore, the default bridge priority was 32768 With the addition of the extended-system ID, adding the VLAN ID number to the bridge priority, that changed. So, the default VLAN ID is 1, therefore the bridge priority in total isn’t 32768, its 32769. In the default VLAN of 1, the default bridge priority is 32769, which is 32768+1. What is the...
Basic Network Fundamental (VLAN, Broadcast Domain, Benefits of using the VLAN, Inter Vlan Routing Detail)
What is the VLAN? • VLAN is partitioned and isolated broadcast domain into separate LAN network at Layer 2 (Data Link Layer). • The switch will consider each VLAN as a separate LAN and it will not forward traffic between VLAN’s. What is the Broadcast Domain? • LAN is a group of devices (PCs, Servers, routers, switches, etc.) in a single location (home, office, etc.) • A LAN is a single broadcast domain, including all devices in that broadcast domain. What is the benefit to using the VLAN? • When it comes to Performance - lots of unnecessary broadcast traffic can reduce network performance. • Whether it’s a broadcast from one end host or a switch that doesn’t know how to reach the destination MAC address, so it floods the frame, we should minimize unnecessary traffic in our network. • When it comes to Security – Even within the same office, you want to limit who has access to what. You can apply security policies on a router/firewall. • Because this is one LAN, PCs can reach each other ...