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Chapter 5

Using Spanning Tree with VLANs

Remember that you need to reset the switch after erasing the configura-

tion to clear the configuration. We need to reconfigure the switch with an IP
address and trunking on ports 1/1 and 1/2. Now, we're also going to delete
the configuration on the 1900 so we then will have both switches back to our
STP default:

1900A#delete nvram

This command resets the switch with factory defaults. All system

parameters will revert to their default factory settings. All

static and dynamic addresses will be removed.

Reset system with factory defaults, [Y]es or [N]o? Yes

Now that we have both the switches back to their default configurations,

we'll just configure the IP addresses and turn on trunking on ports 1/1 and
1/2 of the 5000 and ports 0/26 and 0/27 of the 1900:

#config t

(config)#hostname 1900A

1900A(config)#ip address 172.16.10.2 255.255.255.0

1900A(config)#ip default-gateway 172.16.10.1

1900A(config)#int f0/26

1900A(config-if)#trunk on

1900A(config-if)#int f0/27

1900A(config-if)#trunk on

Console> (enable) set prompt Todd5000>

Todd5000> (enable) set int sc0 172.16.10.4 255.255.255.0

Interface sc0 IP address and netmask set.

Todd5000> (enable) set trunk 1/1 on

Port(s) 1/1 trunk mode set to on.

Todd5000> (enable) set trunk 1/2 on

Port(s) 1/2 trunk mode set to on.

Todd5000> (enable)

To verify that the ports are trunking, use the show trunk command:

Todd5000> (enable) sh trunk

Port Mode Encapsulation Status Native vlan

-------- ----------- ------------- ---------- -------

1/1 on isl trunking 1

1/2 on isl trunking 1

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