Red Hat Fedora 5 Unleashed

The Foundation Summary is a collection of tables that provides a convenient review of many key concepts in this chapter. If you are already comfortable with the topics in this chapter, this summary could help you recall a few details. If you just read this chapter, this review should help solidify some key facts. If you are doing your final preparation before the exam, these tables and figures are a convenient way to review the day before the exam.

Table 6-2. VLAN Trunk Encapsulations

Encapsulation

Tagging Characteristics

ISL

Adds a 26-byte header and a 4-byte trailer to each frame, and includes a 15-bit VLAN ID

IEEE 802.1Q

Adds a 4-byte tag, includes a 12-bit VLAN ID

Table 6-3. VLAN and Trunking Configuration Commands

Task

Command Syntax

Create VLAN

vlan vlan-num name vlan-name

Assign port to VLAN

interface type module/number switchport mode access switchport access vlan vlan-num

Configure trunk

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interface type mod/port switchport trunk encapsulation {isl | dot1q| negotiate} switchport trunk native vlan vlan-id switchport trunk allowed vlan {vlan-list | all | {add | except | remove} vlan-list} switchport mode {trunk | dynamic {desirable | auto}}

Table 6-4. VLAN and Trunking Troubleshooting Commands

Task

Command Syntax

Verify VLAN configuration

show vlan id vlan-id

Verify active trunk parameters

show interface type mod/num trunk

Compare trunk configuration and active parameters

show interface type mod/num switchport

Verify DTP operation

show dtp [interface type mod/num]

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