fast network. (The spare second port might be in use for example for a connection to an ATM attached device that needs a fast path to the SP Switch network).
To make use of both ports, four possible solutions come to mind:
1.Break up your already existing network topology (nodes of the SP) and create different subnets, which in turn can be routed over the different ATM subnets on the two ports.
We do not expect that any customer will do this, but the solution is mentioned here for the sake of completeness.
2.Configure the two ATM ports on different networks and route one half of the nodes over the first ATM port and route the other half over the second ATM port. It will be a pain, though, to maintain the different routes, so solution 4. below might be considered.
3.Configure the two ATM ports for transparent bridging and use the two ports simultaneously with just one IP address assigned to them. This solution sounds promising and will be covered in Section 7.1.2, “ATM
4.Configure dynamic routing and use the open shortest path first (OSPF) protocol to use the two ATM ports equivalently. They have to be in different subnets, but gated will take care of that. Configuring gated is said to be a
7.1.1 ATM OC-3c Backbone - Using One Port
Now, let us consider the setup of the
Configuration assumptions:
•The SP Switch Router ATM media card has been installed according to Section 4.2, “ATM
•The SP Switch Router Adapter card has been installed according to Section 3.7,
•The SP Switch Router Adapter card and SP processor node Switch adapters are in the same IP subnet on the respective SP.
•ARP should be enabled on the SP Switch network to provide the most flexibility in assigning IP addresses (strongly recommended!).
