IBM Nortel Networks L2/3, Manual

Page: 87 / 190

Chapter 7. Nortel Networks L2/3 GbESM configuration and network integration
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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 7-4 links 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