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Layer 2 Dynamic Switchports

Configure all inter-switch links on SW2, SW3, and SW4 to be in dynamic auto state and configure all inter-switch links on SW1 to be in dynamic desirable state.

SW1:
interface range FastEthernet0/13 - 21
switchport mode dynamic desirable
SW2:
interface range FastEthernet0/13 - 21
switchport mode dynamic auto
SW3:
interface range FastEthernet0/13 - 21
switchport mode dynamic auto
SW4:
interface range FastEthernet0/13 - 21
switchport mode dynamic auto

 

Verification:Using the CAM table verify that all layer 2 traffic between devices in the same VLAN, but not attached to the same switch, is transiting SW1.

R4#ping 155.1.146.6
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 155.1.146.6, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
R4#sh arp          
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  155.1.146.1            85   0025.84e8.6381  ARPA   FastEthernet1/1
Internet  155.1.146.4             -   001b.2ad6.f9d2  ARPA   FastEthernet1/1
Internet  155.1.146.6             0   0007.0e45.7f01  ARPA   FastEthernet1/1
Internet  204.12.1.4              -   001b.2ad6.f9d1  ARPA   FastEthernet1/0
Internet  204.12.1.254            0   001b.2ae2.c9c1  ARPA   FastEthernet1/0

 

SW2#sh mac addr dynamic address 0007.0e45.7f01
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
   1    0007.0e45.7f01    DYNAMIC     Fa0/6
 146    0007.0e45.7f01    DYNAMIC     Fa0/6
Total Mac Addresses for this criterion: 2

 

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