2.Enable 802.1Q tagging with VLAN 5 untagged and allow the VLANs which should be carried over the aggregated ports:

switchport trunk encapsulation dot1q switchport trunk native vlan 5 switchport trunk allowed vlan 5,10,20,99 switchport mode trunk

3.Disable the Cisco proprietary dynamic trunk protocol DTP: switchport nonegotiate

4.Enable aggregation by choosing a channel-group number and mode on: channel-group 1 mode on

This creates and enables a virtual interface called Port-channel1 (po1). Remember that the ports are still disabled.

Now, to simulate the core network, Example 7-4links both Cisco switches together (g0/23) and also links them further upstream (g0/24):

Example 7-4 Links

interface g0/23

 

switchport trunk encapsulation dot1q

 

switchport trunk native vlan 5

 

switchport trunk allowed vlan 5,10,20,99

 

switchport mode trunk

 

!

 

interface g0/24

 

no switchport

 

ip address 9.42.171.245 255.255.255.0

! ip address 9.42.171.246 255.255.255.0

!

 

ip default-gateway 9.42.171.3

 

The host name was set in order to easily identify the switch on the command line. All configuration changes were then saved:

hostname Core1

/* hostname Core2

end

 

wri mem

 

All other configuration to the switch can be left as default. The above examples set up aggregation for ports g0/1 and g0/2 and allow for the channel to carry the VLANs used in the experiment. The Cisco switch itself can also be accessed on the management VLAN 99.

Nortel Networks L2/3 GbESM switch configuration

In Example 7-8 on page 76, each static trunk created on the Cisco switch connects to EXT1 and EXT2 of its adjoining Nortel GbESM. Again, as with the Cisco, the native VLAN here is VLAN 1. This is also default for the Nortel switch.

First, ports EXT1 and EXT2 must be configured as tagged:

1.Tagging on the INT ports is enabled by default due to all INT ports being members of VLAN 1 and 4095:

/c/port EXT1 tag ena

/c/port EXT2 tag ena

Chapter 7. Nortel Networks L2/3 GbESM configuration and network integration 73

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IBM manual Nortel Networks L2/3 GbESM switch configuration, Example 7-4 Links