Nortel Alteon OS 42C4911 Application Manual page 183

1. Define the VLANs.
For simplicity, both default gateways are configured in the same VLAN in this example. The
gateways could be in the same VLAN or different VLANs
>> # /cfg/l2/vlan 1
>> vlan 1# add <port number>
2. Define the IP interfaces.
The switch will need an IP interface for each default gateway to which it will be connected.
Each interface will need to be placed in the appropriate VLAN. These interfaces will be used
as the primary and secondary default gateways for the switch.
>> IP# metrc strict
>> IP# if 1
>> IP Interface 1# ena
>> IP Interface 1# addr 200.200.200.1
>> IP Interface 1# mask 255.255.255.0
>> IP Interface 1# ../ip/if 2
>> IP Interface 2# ena
>> IP Interface 2# addr 210.210.210.1
>> IP Interface 2# mask 255.255.255.0
3. Enable IP forwarding.
IP forwarding is turned on by default and is used for VLAN-to-VLAN (non-BGP) routing.
Make sure IP forwarding is on if the default gateways are on different subnets or if the switch
is connected to different subnets and those subnets need to communicate through the switch
(which they almost always do).
>> /cfg/l3/frwd on
N – To help eliminate the possibility for a Denial of Service (DoS) attack, the forwarding of
OTE
directed broadcasts is disabled by default.
42C4911, January 2007
Alteon OS Application Guide
.
(Select VLAN 1)
(Add a port to the VLAN membership)
(Set metric for default gateway)
(Select default gateway interface 1)
(Enable switch interface 1)
(Configure IP address of interface 1)
(Configure IP subnet address mask)
(Select default gateway interface 2)
(Enable switch interface 2)
(Configure IP address of interface 2)
(Configure IP subnet address mask)
(Enable IP forwarding)
Chapter 11: Border Gateway Protocol 183