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Section 2.1.c (iii) Normal, Extended VLAN, Voice VLAN 99% of the time when you are working with vlans, you will be working with normal and extended vlans. The normal range is 1 - 1001 The reserved range is 1002-- 1005 The extended range is 1006 - 4094 The reserved range is reserved for FDDI …
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Section 2.1.c (ii) VLAN Database The vlan database is what holds all VLAN and some VTP configuration. This database is stored as the file vlan.dat in NVRAM/flash. Since vlan information is not entirely saved in the running or startup config, an erase of these configs will not remove vlans from the switch. One would need …
Section 2.1.c (i) Access Ports Access ports are used to configure end devices where we want to restrict their membership to a certain vlan. They are called access ports because they are mainly used in the access layer. If an access port receives a frame with a .1q header, it will drop it. What are …
Section 2.1.c Implement and Troubleshoot VLAN We cannot discuss VLANs until we learn the dot1q tag in depth. The dot1q header comes before the ethertype field in ethernet. It is a 4 byte value used to denote these 3 fields: 802.1P (class of service/layer 2 qos) DEI: Drop eligible indicator ID: vlan membership
Section 2.1.b (i) UDLD Unidirectional Link Detection is a Cisco Proprietary protocol used to detect issues with links that utilize separate cables (fiber). UDLD can be enabled and becomes active when it detects a neighbor from the other side (both sides must be configured) Thus UDLD can only successfully work when configured on both …
Section 2.1.b (i) CDP, LLDP CDP: We will start this discussion with the Cisco Discovery Protocol (CDP), a proprietary protocol invented by Cisco for finding directly connected device information. CDP is encapsulated in 802.3 Ethernet not Ethernet II. This feature is enabled by default and transmits every 60 seconds with a hold/expire time of …