CCNA Routing and Switching Lesson 13 - Switching - Eric Vanderburg

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CCNA Routing and Switching Lesson 13 - Switching - Eric Vanderburg

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CCNA Routing and Switching Lesson 13 - Switching - Eric Vanderburg

  1. 1. Switching Networking Essentials – Eric Vanderburg © 2005
  2. 2. Port Security Switchport port security mac-address mac-address  Switchport port security mac-address sticky – learn first MAC used and restrict to that one 
  3. 3. Switch modes Store & forward – waits until entire frame is analyzed to forward  Fragment free – looks at first 64 bytes before forwarding  Cut through – forwards ASAP  Adaptive cut through – acts like cut through unless many errors are encountered. If so, switches to store & forward  Switching-mode store-and-forward 
  4. 4. STP 802.1d  Used to reduce forwarding loops  Allows redundancy without looping  Elects root bridge based on lowest bridge ID (MAC & priority)  Root ports are put in forwarding state, others in blocking  Root switch enables all ports 
  5. 5. Other features EtherChannel – allows multiple trunk links to be used as one (2-8 links)  PortFast – ports connected to hosts can be enabled at once as soon as the first frame is received 
  6. 6. RSTP 802.1w  Faster convergance  PortFast & Etherchannel are both built-in  Does not work when hubs are on the network  Can negotiate a new path to root automatically without a link going down first 
  7. 7. VLANs Segment into multiple broadcast domains  Requires layer 3 device to send data between VLANs  Requires trunking to move data to VLANs spread between switches 
  8. 8. Trunking  ISL (Inter-Switch Link)   IEEE 802.1q    encapsulates Default VLAN Changes header Trunk Types     On Off Desirable Auto
  9. 9. VTP VTP allows configuration changes to be propagated to other switches in the same domain  VTP modes  Server mode  Client mode  Transparent mode   VTP pruning – does not send VTP info to a switch that has no ports in that VLAN
  10. 10. Switch commands  Interface fastethernet 0/0       Duplex full / half / auto Speed 10 / 100 / 1000 / auto Spanning-tree cost cost – changes priority Channel-group # - enables etherchannel Show spanning-tree – view info on rootID, bridgeID, & ports that are blocking or forwarding Show vtp status – shows number of VLANs, operating mode for this device, & domain name,
  11. 11. Trunking  interface fastethernet 0.1 encapsulation isl 1  encapsulation dot1q 2 (do not set for main interface because that will be default vlan) 
  12. 12. VLAN comands  Vlan database       SW1(vlan)# Vlan 1 name Test Vlan 2 name Sample Vtp domain SampleDomain Exit – must exit for changes to take place Vtp pruning – turns pruning on in global config  Interface fastethernet 0/0    Switchport mode access – not trunk Switchport access vlan 1 Interface range fastethernet 0/1 – 10
  13. 13. 1900 switch  Interface fastethernet 0/0 Vlan-membership static 2  Exit   Set up vlans in configure terminal instead of vlan database
  14. 14. Trunking commands  Interface fastethernet 0/0 Switchport mode dynamic desirable  Switchport mode dynamic auto  Switchport mode trunk  Switchport mode access   Interface ethernet 0.2 Encapsulation isl vlan#  Encapsulation dot1q vlan# 

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